AC Running But Not Cooling? - Same-Day Service Available in Los Angeles

AC Not Cooling in Los Angeles? Here's What's Wrong and How Fast We Can Fix It.

If your AC is running but not cooling your house, blowing hot air, or your air conditioner is not cooling in Los Angeles, South Bay, or Orange County, AIRONE Heating and Cooling (aironeheatingandcoolinginc.com/ac-not-cooling) diagnoses the cause - low refrigerant, failed capacitor, frozen coil, dirty condenser, or compressor issue - and repairs same-day at flat-rate pricing. $89 diagnostic, applied toward repair if you proceed. All brands. CA License #114807. Call (323) 471-1037.

Call (323) 471-1037 - Same-Day AC Diagnosis

Licensed C-20 HVAC technicians available today across most of LA County, South Bay, and Orange County. $89 diagnostic fee applied toward your repair. Flat-rate pricing - no surprises. CA License #114807.

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Self-Diagnosis Checklist

Five Things to Check Before Calling - You May Be Able to Fix This Right Now

Before calling a technician, check these five things in order - each takes under two minutes, costs nothing, and each one is a common reason an AC appears to run without cooling.

1

Is the thermostat set to COOL (not FAN)?

Check your thermostat first. If it is set to FAN or FAN ONLY, the blower runs and circulates air - but the compressor never starts, so no cooling happens. The fix: set the mode to COOL and the temperature setpoint 3 to 5 degrees below the current room temperature. Wait 3 minutes. If cold air starts flowing, this was your problem - no technician needed.

Also check: Is the thermostat screen blank or dim? Replace the batteries. A wireless thermostat with dead batteries sends no signal to the system even if it appears on.

2

Is the air filter clogged?

A clogged air filter blocks airflow across the evaporator coil. When airflow drops too low, the coil temperature falls below freezing, ice forms on the coil, and the system cannot transfer heat - the air coming out of your vents feels warm or barely cool even though the unit is running. Pull the filter from the return air grille and hold it up to a light. If you cannot see light through it, replace it immediately. A new filter costs $5 to $25 at any hardware store and takes 60 seconds to install. After replacing, run the system for 30 minutes and check again.

Important: If the coil was already frozen when you replaced the filter, the system needs to thaw before cooling resumes - see Check 5 below.

MERV rating note: If your AC started underperforming after upgrading to a MERV 13 filter, the higher MERV rating may be contributing to coil freezing. MERV 13 filters restrict significantly more airflow than the MERV 8 filters most older LA systems were designed for. If you recently switched to a MERV 13 or higher, try reverting to MERV 8 before calling a technician - this is a free fix that resolves a growing share of AC not-cooling complaints as homeowners maintain post-pandemic air quality habits. Ask AIRONE whether your specific system is rated for MERV 13.
3

Is the outdoor condenser unit running?

Walk to your outdoor unit and look and listen. The condenser fan should be spinning on top of the unit. If the unit is completely silent and still - no fan, no hum - the system has shut off on a safety switch, lost power to the outdoor unit, or has a failed capacitor or contactor. Check the electrical breaker for the outdoor AC unit in your breaker panel. If it is tripped, reset it once. If it trips again immediately, stop - do not reset a breaker that trips repeatedly. Call (323) 471-1037.

If you hear a humming sound but the fan is not spinning, this is a classic symptom of a failed run capacitor. This is a $150–$400 repair that AIRONE can fix same-day.

4

Are the supply vents open and unblocked?

Walk through the home and check that supply vents (the vents air comes out of) are open and unobstructed by furniture, rugs, or drapes. A blocked supply vent in a single room does not cause the whole system to fail, but multiple blocked vents reduce airflow enough to degrade cooling performance across the home. This takes two minutes to check and costs nothing to fix.

5

Is there ice on your refrigerant lines or indoor unit?

Find the refrigerant lines running from your outdoor unit into the home - two copper tubes, usually wrapped in insulation. Touch the larger insulated line. If it feels extremely cold or you see frost or ice, the evaporator coil inside your air handler has frozen. This blocks airflow completely.

What to do if frozen: Turn the system to FAN ONLY (not OFF, not COOL). This runs the blower without the compressor and thaws the coil with room-temperature air. Thawing typically takes 1 to 4 hours. Place towels under the air handler to catch condensate water from the thawing ice. After thawing, replace the air filter (see Check 2). Turn the system back to COOL and monitor. If it refreezes within a few hours, you have a refrigerant leak or coil issue that requires a technician.

Checked all five and still not cooling?

Call (323) 471-1037

$89 flat-rate diagnostic, applied toward your repair

10 Most Common Causes

Why Is Your AC Running But Not Cooling? The 10 Most Common Causes in Los Angeles

An AC that runs but does not cool has one of ten root causes. The self-diagnosis checklist above identifies some. The rest require a technician's diagnostic tools - a refrigerant manifold gauge, electrical meter, and system knowledge - to confirm. Here is what each cause looks and sounds like, and what fixing it costs.

Cause 1 - My AC is running but blowing warm air. Could it be low refrigerant?

The most common reason an AC runs without cooling is low refrigerant caused by a leak in the system. Refrigerant is the substance that absorbs heat from your home's air and releases it outside - without enough of it, the system cannot transfer heat regardless of how long it runs. Refrigerant does not deplete like a gas tank. If your system is low on refrigerant, there is a leak somewhere in the refrigerant circuit - adding refrigerant without finding and repairing the leak is only a temporary fix. Signs your system is low on refrigerant: warm or barely-cool air from vents despite the system running, ice forming on the refrigerant lines or indoor coil, hissing or bubbling sounds near the indoor unit, and noticeably higher electricity bills as the system runs longer to compensate.

Important: Per EPA Section 608, refrigerant recovery and handling must be performed by a licensed HVAC technician. You cannot legally add refrigerant to your own system. AIRONE diagnoses refrigerant leaks, repairs the leak, and recharges the system per EPA compliance standards.

Cost range: $350–$1,200

Cause 2 - Can my AC freeze up and stop cooling even in hot weather?

Yes - a frozen evaporator coil is one of the most common reasons an AC runs but does not cool, even on the hottest days. The evaporator coil sits inside your air handler and is responsible for absorbing heat from your home's return air. When airflow across the coil drops too low - from a clogged filter, blocked return vent, or low refrigerant - the coil temperature drops below freezing and ice forms. Ice on the coil blocks airflow entirely, causing warm air from the vents or no air at all. A frozen coil is a symptom, not a root cause. The root cause is usually a clogged filter, low refrigerant, or a dirty coil that needs professional cleaning. See the self-diagnosis checklist above for the thaw procedure.

Cost range: Coil cleaning $200–$500

Cause 3 - What is a capacitor and why does it make AC stop cooling?

The run capacitor is an electrical component that provides the starting and running power for the compressor and condenser fan motor. When it fails, the compressor cannot start - the blower inside your home continues to run (pushing uncooled air through the vents), but the outdoor unit does not engage, and no cooling occurs. The signature sound of a failed capacitor: a humming or buzzing from the outdoor unit with no fan movement. The outdoor fan may spin briefly if pushed manually, or may not spin at all. Capacitor failure is among the most common AC repairs in Southern California - according to NOAA historical climate data, SoCal's 7 to 9 month cooling season places significantly higher cycle counts on capacitors and compressors than most US markets. Capacitors wear faster in high-heat, high-cycle environments.

Cost range: $150–$400 - same-visit

Cause 4 - AC won't cool. Could the contactor be the problem?

The contactor is the electrical switch that receives a signal from the thermostat and sends power to the compressor and condenser fan motor. When it fails - either stuck open (no power reaches the compressor) or stuck closed (compressor runs continuously even when not needed) - the system may appear to be running but produces no cooling. Symptoms: outdoor unit does not activate when thermostat calls for cooling; or conversely, outdoor unit runs continuously regardless of thermostat setting.

Cost range: $200–$400

Cause 5 - Can dirty coils cause my AC to stop cooling?

Yes - a dirty condenser coil significantly reduces your system's ability to reject heat to the outside air. The condenser coil (inside or surrounding the outdoor unit) transfers heat from the refrigerant to the outside environment. When the coil is coated with dirt, smog deposits, pollen, cottonwood fibers, or airborne debris, heat transfer efficiency drops - the refrigerant remains warmer than it should, the system's cooling capacity decreases, and warm air comes out of the vents. In the Los Angeles basin, smog deposits and seasonal cottonwood from trees are common causes of condenser coil fouling - more so than in cleaner-air markets. Annual AC maintenance includes condenser coil cleaning specifically to prevent this failure mode.

Cost range: $150–$300

Cause 6 - What is an evaporator coil and how does it cause warm air?

The evaporator coil (inside your air handler) absorbs heat from your home's return air. Over time, even with a functional air filter, dust and biofilm accumulate on the coil surface. A dirty evaporator coil cannot absorb heat efficiently - the air passing over it is not adequately cooled before being distributed through the ducts. Unlike a frozen coil (see Cause 2), a dirty-but-not-frozen evaporator coil causes gradual degradation: the system cools less effectively over time rather than stopping suddenly.

Cost range: $200–$500

Cause 7 - Why is my AC cooling some rooms but not others?

If your AC cools well in some rooms but certain areas - particularly rooms farthest from the air handler - are consistently warm despite the system running, the cause is often ductwork leakage. According to the US Department of Energy, duct leakage wastes 20 to 30% of conditioned air in a typical home. Conditioned air escapes into unconditioned attic or crawl space before reaching the intended rooms. This causes the "AC running but not cooling" experience for specific zones while other areas of the home feel comfortable. Note: this is NOT a refrigerant or capacitor issue - it is a ductwork issue. An HVAC technician who diagnoses "low refrigerant" in a scenario where only certain rooms are warm is likely misdiagnosing the problem.

Cost range: $300–$800

See also: Duct Sealing and Repair →

Cause 8 - How do I know if my AC compressor is failing?

Compressor failure is the most expensive individual AC component repair - and in many cases, it is also the trigger for system replacement rather than repair. Signs of compressor failure: outdoor unit hums loudly but fan does not run; unit shuts off on a safety switch immediately after starting; indoor blower runs but no cooling regardless of how long the system operates. Per the $5,000 rule referenced by Consumer Reports, if the repair cost (compressor replacement) plus your system's age in years times the cost exceeds $5,000, replacement is typically the more economical choice. For R-22 systems specifically, a failed compressor is almost always a replacement trigger - the combination of refrigerant cost and compressor cost for an aging R-22 system consistently exceeds the value of continued repair.

Cost range: $1,200–$2,800 - often triggers replacement

See also: AC Replacement →

Cause 9 - Why does my AC stop cooling only during heat waves or the hottest days?

If your AC cools adequately on normal days but cannot keep up when outdoor temperatures exceed 95 to 100 degrees Fahrenheit, your system may be correctly functional but undersized for your home's heat load at peak conditions. According to NOAA historical temperature data, the San Fernando Valley regularly records sustained temperatures above 105 degrees Fahrenheit in July and August - conditions that can overwhelm a system that was adequately sized for average conditions. Additionally, according to ACCA, up to 50% of residential HVAC systems are incorrectly sized - many are undersized because the original contractor used a square-footage rule of thumb rather than a Manual J load calculation.

This is not an emergency repair - no component has failed. It is a sizing issue that AIRONE can assess with a free in-home Manual J evaluation. Also relevant: LADWP and SCE voltage conditions during heat advisories. High demand events can cause momentary voltage fluctuations that stress capacitors and reduce compressor efficiency - explaining why some systems underperform specifically during peak-demand heat events even when properly sized.

Cause 10 - Could my thermostat be why my AC isn't cooling?

Yes - thermostat and control board issues cause a surprising number of "AC not cooling" calls. The most common thermostat causes: set to FAN-ONLY mode (see self-diagnosis checklist above), dead batteries in wireless thermostats, incorrect wiring after a DIY thermostat replacement, and thermostat failure. Control board issues are less common but produce similar symptoms - the system appears to run (blower operates) but the compressor never receives the signal to engage. These issues require diagnostic tools to confirm.

Thermostat $150–$350 · Control board $300–$600

Diagnosed your problem? AIRONE fixes same-day across LA County, South Bay, and Orange County.

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Cost by Diagnosis

What Does It Cost to Fix an AC That Is Not Cooling in Los Angeles?

Cost depends entirely on the diagnosis. AIRONE charges a flat $89 diagnostic fee - applied toward the repair if you proceed. Here are the repair cost ranges for each cause listed above.

AC not cooling repair cost ranges in Los Angeles by diagnosis
Cause Typical Cost Notes
Thermostat setting / battery (DIY)$0–$15Self-fix
Air filter replacement (DIY)$0–$30Self-fix, 60 seconds
AIRONE diagnostic fee$89Applied toward repair
Capacitor replacement$150–$400Same-visit in most cases
Condenser coil cleaning$150–$300Same-visit
Contactor replacement$200–$400Same-visit in most cases
Thermostat replacement (installed)$150–$350Same-visit
Evaporator coil cleaning$200–$500Same-visit
Targeted duct sealing$300–$800Scheduled repair
Refrigerant leak repair + recharge$350–$1,200Varies by leak location
Control board replacement$300–$600Parts availability varies
Compressor replacement$1,200–$2,800Often triggers replace decision

Is the $89 diagnostic fee charged even if you don't repair?

Yes - the $89 diagnostic fee is charged for the technician's time and assessment regardless of whether you proceed with the repair. If you do proceed with the repair, the $89 is applied toward the repair cost - you do not pay the diagnostic fee separately. AIRONE provides a written flat-rate repair quote before any work begins. The price on the quote is the price on the invoice.

Why does refrigerant leak repair cost so much more than other fixes?

Refrigerant leak repair cost varies widely because leak location determines labor time. A leak at a service valve (accessible, 30-minute fix) costs significantly less than a coil leak inside the air handler (several hours of labor, possible coil replacement). The $350–$1,200 range reflects this variability. AIRONE quotes leak repair after diagnosis with the refrigerant manifold - not before. Any contractor quoting refrigerant repair before seeing the system has not actually diagnosed it.

When does AC not cooling become an AC replacement instead of repair?

The repair-vs-replace decision applies when: (1) the system is 12 or more years old and facing a major repair (compressor, coil); (2) the system uses R-22 refrigerant and has any significant repair needed - R-22 is no longer manufactured and remaining supplies are expensive; (3) per the $5,000 rule referenced by Consumer Reports, when repair cost plus age times cost exceeds $5,000; or (4) the system has had multiple repairs in the past two to three years totaling $1,000 or more. AIRONE assesses repair-vs-replace honestly at every diagnostic visit - if replacement is the better financial choice, AIRONE will tell you that.

AIRONE provides a written flat-rate repair quote before any work begins.

Call (323) 471-1037

Repair vs Replace

Should You Repair or Replace an AC That Stopped Cooling?

An AC that stopped cooling does not automatically need replacement. In most cases - capacitor failure, refrigerant leak, dirty coil - repair is the right call. But in some situations, repair is throwing money at a system that is past its cost-effective life. Here is the honest framework.

Four conditions that favor repair over replacement

Repair is almost always the right choice when all four of the following are true: the system is under 10 years old; the repair cost is under $800; the system uses R-410A refrigerant (not R-22); and the system has had no major repairs in the past two to three years. A capacitor, contactor, or coil cleaning on an 8-year-old R-410A system is unambiguously worth repairing.

Four conditions that favor replacement over repair

Replacement deserves serious consideration when any of the following is true: (1) The system uses R-22 (Freon) refrigerant. R-22 production ended in 2020 per EPA phase-out requirements. Servicing R-22 systems requires reclaimed refrigerant at premium prices, and every repair prolongs dependence on an increasingly expensive consumable. A refrigerant leak on an R-22 system is almost always a replacement trigger. (2) The system is 12 or more years old and facing compressor failure - the repair cost approaches the cost of a full replacement. (3) Per the Consumer Reports $5,000 rule: if the repair cost plus the system's age in years times the annual cost of operation exceeds $5,000, replacement is typically the better financial choice. (4) The system has required multiple repairs totaling $1,000 or more over the past two to three years.

What does AIRONE recommend at the diagnostic visit?

At every diagnostic visit for an AC not cooling, AIRONE provides the repair cost in writing and the replacement cost range alongside it - so you can make an informed decision before any money changes hands. If repair is clearly the better choice, AIRONE says so. If the numbers point toward replacement, AIRONE says that instead. The recommendation is based on what is right for your situation - not on which option generates more revenue.

See full repair vs replace framework →

Written repair and replacement quotes side-by-side before you decide.

Call (323) 471-1037

SoCal-Specific Causes

SoCal-Specific Reasons Your AC Is Not Cooling

Several causes of AC not cooling are disproportionately common in Southern California relative to other US markets. If you are in LA County, the South Bay, or Orange County, these context-specific factors are worth knowing.

Why do capacitors fail so often in Southern California?

Capacitor failure is the most common single repair AIRONE performs across the LA market - more common than in cooler US markets. The reason is operating hours. According to NOAA historical temperature data, the Los Angeles basin has a 7 to 9 month cooling season - significantly longer than the national average of 3 to 4 months. An AC system in Burbank or Pasadena cycles its capacitor and compressor two to three times more per year than a comparable system in a cooler city. This accelerated cycle count wears capacitors significantly faster. Preventive replacement of aging capacitors during annual maintenance is standard practice in the LA market specifically because of this dynamic.

Why do condenser coils get dirty faster in Los Angeles?

The Los Angeles basin has elevated ambient particulate levels - smog, automotive exhaust, and seasonal cottonwood fiber from trees are all common contributors to condenser coil fouling. A condenser coil that might need cleaning every two to three years in a cleaner-air market may need cleaning annually in central LA or the San Fernando Valley. If your AC has not had a maintenance visit including coil cleaning in over a year, dirty coils are a high-probability cause of your not-cooling complaint.

Why does my AC stop cooling specifically during heat advisories?

During heat advisories - declared by the Los Angeles County Office of Emergency Management and aligned with NOAA temperature thresholds - LADWP and SCE experience peak demand events. This can cause localized voltage fluctuations in residential neighborhoods as transformer and grid load peaks. Momentary undervoltage conditions (brownout-level events that don't register as full outages) stress capacitors and can cause compressors to trip on thermal protection, shutting down the cooling circuit while the blower continues to run - producing the "running but not cooling" symptom. If your system fails specifically during heat advisory conditions and recovers when the heat advisory passes, capacitor or compressor thermal protection issues in combination with voltage conditions are worth investigating.

Coastal homes: why does my AC not cool as well as it used to?

For South Bay and coastal Orange County homes - particularly those within one to two miles of the ocean - salt air accelerates condenser coil corrosion. According to ASHRAE corrosion research, salt air exposure reduces condenser coil lifespan by 30 to 40% compared to inland installations. A corroded condenser coil cannot reject heat efficiently, causing the "running but not cooling" experience. This failure mode is gradual rather than sudden - the system cools progressively less effectively over one to two seasons before becoming noticeably inadequate. Corroded coils often require coil replacement rather than just cleaning. Marine-grade coil coating at installation time prevents this.

AIRONE technicians know SoCal-specific failure modes. Same-day diagnosis across LA County, South Bay, and Orange County.

Call (323) 471-1037

Service Areas

AC Not Cooling Service Areas - Los Angeles County, South Bay, and Orange County

AIRONE diagnoses and repairs AC not cooling across 120+ cities in Southern California. Same-day diagnostic available across most of the service territory. $89 flat-rate diagnostic, applied toward repair.

AIRONE same-day AC repair across Los Angeles County

Los Angeles County - AC Not Cooling Repair

Looking for same-day AC repair near you in Los Angeles County? Yes - AIRONE provides same-day AC not cooling diagnosis and repair throughout all of Los Angeles County. Spring and summer AC calls peak in the San Fernando Valley and San Gabriel Valley, where sustained summer temperatures frequently exceed 100 degrees Fahrenheit per NOAA historical data - schedule early in the season to avoid peak dispatch delays. Same-day available on most calls.

Key cities: Los Angeles · Pasadena · Burbank · Glendale · Long Beach · Santa Monica · West Hollywood · Culver City · West Covina · Pomona · Santa Clarita · Torrance · Whittier · Lancaster · Palmdale and 67 more cities.
Call (323) 471-1037 - same-day diagnosis in LA County →
AIRONE same-day AC repair across the South Bay - marine-grade coil expertise

South Bay - AC Not Cooling Repair

Looking for same-day AC repair near you in the South Bay? Yes - AIRONE provides same-day AC not cooling diagnosis and repair throughout the South Bay. For coastal South Bay properties in Manhattan Beach, Redondo Beach, and Hermosa Beach, AIRONE technicians assess salt air condenser coil corrosion as a standard part of the AC not cooling diagnostic - this is a common cause in coastal properties and is often misdiagnosed by contractors unfamiliar with coastal conditions.

Cities: Manhattan Beach · Redondo Beach · Hermosa Beach · Torrance · Hawthorne · Inglewood · Gardena · Carson · El Segundo · Lawndale · Lomita · Palos Verdes Estates.
Call (323) 471-1037 - same-day diagnosis in the South Bay →
AIRONE same-day AC repair across Orange County

Orange County - AC Not Cooling Repair

Looking for same-day AC repair near you in Orange County? Yes - AIRONE provides same-day AC not cooling diagnosis and repair throughout Orange County with flat-rate pricing across all OC cities. Coastal OC properties in Huntington Beach, Newport Beach, and Laguna Beach face the same salt air coil corrosion conditions as the South Bay. Inland OC cities - Anaheim, Irvine, Yorba Linda - experience high summer heat loads that stress capacitors and compressors faster than coastal areas.

Key cities: Anaheim · Irvine · Santa Ana · Huntington Beach · Fullerton · Costa Mesa · Newport Beach · Mission Viejo · Yorba Linda · Garden Grove · Tustin and 21 more cities.
Call (323) 471-1037 - same-day diagnosis in Orange County →

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Why AIRONE

Why Los Angeles Homeowners Call AIRONE When Their AC Stops Cooling

Does AIRONE offer same-day AC repair in Los Angeles?

Yes - same-day AC diagnosis and repair is available across most of Los Angeles County, South Bay, and Orange County. When you call (323) 471-1037, a live AIRONE dispatcher confirms current-day availability in your specific city. No voicemail. No answering service. A live dispatcher answers every call. AIRONE service appointments are available Monday through Saturday 7:00 AM to 7:00 PM. Emergency HVAC dispatch is available 24 hours a day, 7 days a week.

What is the $89 diagnostic and how does it work?

AIRONE charges a flat $89 diagnostic fee for every AC not cooling service call. The technician arrives, uses refrigerant manifold gauges, an electrical meter, and system knowledge to identify the root cause, and provides a written flat-rate repair quote before any work begins. If you approve the repair and proceed, the $89 diagnostic fee is applied toward the repair cost - you do not pay it separately. The price on your written repair quote is the price on your invoice.

Do you repair all brands of AC?

Yes - AIRONE diagnoses and repairs all major residential AC brands including Carrier, Trane, Lennox, Rheem, Goodman, Daikin, York, Mitsubishi, Fujitsu, American Standard, Bryant, Amana, Heil, and Coleman. AIRONE technicians stock common replacement parts - capacitors, contactors - for the most widely installed residential AC brands in the LA market to enable same-visit repairs on the most common failure types.

Do you use subcontractors?

No - every AIRONE repair is performed by a direct AIRONE employee. The technician who diagnoses the system is the same technician who repairs it and signs off on the job completion report.

Are you licensed for AC repair in California?

Yes - CA Contractor License #114807, C-20 certified. The C-20 classification is the California contractor license specifically required by law for HVAC work. Verify at cslb.ca.gov. According to CSLB data, fewer than 40% of HVAC contractors operating in Los Angeles are fully licensed, bonded, and insured. Unlicensed contractors cannot legally purchase refrigerant or perform refrigerant recovery under EPA Section 608.

Call (323) 471-1037 - same-day diagnosis →

Do you handle AC repairs for rental property tenants or landlords?

Yes - AIRONE provides AC not cooling diagnosis and repair for both rental property owners and tenants across Los Angeles County, South Bay, and Orange County.

For landlords and property managers:

AIRONE provides a written service report after every diagnostic visit, itemizing the root cause, repair performed, and parts replaced - documentation suitable for property maintenance records and tenant communications. Same-day service is available on most calls, reducing tenant displacement and habitability liability.

For tenants:

If your rental unit's AC is running but not cooling and your landlord has not responded within a reasonable timeframe, California law is relevant. Under California Civil Code § 1941, landlords are required to maintain rental units in a habitable condition. Working air conditioning is considered part of habitability in units where AC was part of the original lease terms or has been provided as a standard amenity. If the unit is uninhabitable due to heat - particularly during an officially declared heat advisory - the landlord's repair obligation is more urgent. Tenants in this situation have the right to request repairs in writing (certified mail or email with read receipt creates a documented record), and in some jurisdictions may withhold rent or arrange for repair and deduct the cost from rent if the landlord fails to act within a reasonable time after written notice, subject to California Civil Code §§ 1941–1942.

Practical tenant steps in Los Angeles:

Step 1: Send written notice to your landlord or property manager stating the AC is not cooling, the date the problem started, and requesting repair. Keep a copy with date and time stamp.
Step 2: If no response within 24 to 48 hours during a heat event, or 3 to 5 business days under normal conditions, contact the Los Angeles Housing Department (LAHD) at (866) 557-7368 to file a habitability complaint.
Step 3: If your landlord authorizes AIRONE to perform the repair, AIRONE can bill the property owner directly with a written authorization.
Step 4: If your landlord does not respond and you need same-day service, call AIRONE at (323) 471-1037 and discuss the repair-and-deduct option with your landlord and, if necessary, a tenant's rights organization before proceeding.

AIRONE works with landlords, property managers, and tenants throughout the LA market and can schedule repairs with access coordinated around tenant availability. Written service reports are provided on every job.

Call (323) 471-1037 - same-day diagnosis for rental properties →

Does AIRONE repair window AC units, heat pumps, or portable air conditioners?

Window AC units:

AIRONE does not repair window AC units. Window units are self-contained appliances - they are not HVAC systems under California's C-20 contractor classification. For a window unit that is running but not cooling, the most common fixes are accessible to homeowners without a technician: clean the filter and coils (accessible from the front panel), verify the unit is set to COOL mode (not FAN), and confirm the unit is not struggling against a heat load that exceeds its capacity in BTUs. If the unit runs continuously without cooling after these checks, the sealed refrigerant system has likely failed - window unit refrigerant systems are not rechargeable and unit replacement is typically the correct path. AIRONE can help you evaluate a central AC replacement if a window unit has been filling the gap for a home that originally had central air.

Heat pumps:

Yes - AIRONE diagnoses and repairs heat pumps that are running but not cooling. Heat pump not-cooling has distinct root causes from standard AC: the reversing valve (the component that switches the system between heating and cooling mode) can fail in a position that prevents cooling; the defrost cycle can become stuck, limiting cooling capacity; and refrigerant issues behave differently across heating and cooling modes. If your heat pump is running but blowing warm air in cooling mode, call (323) 471-1037 for a same-day diagnostic - AIRONE technicians are trained on heat pump reversing valve diagnosis.

Portable AC units:

AIRONE does not repair portable (freestanding) AC units. Like window units, portable ACs are self-contained appliances outside the C-20 HVAC contractor scope. For a portable unit not cooling, check the exhaust hose seal at the window - an improperly sealed exhaust hose recirculates hot exhaust air back into the room, causing the unit to run continuously without cooling.

Call (323) 471-1037 to discuss central or ductless system options →

Call (323) 471-1037

Customer Reviews

What Los Angeles Homeowners Say About AIRONE AC Repair

5.0 Average Rating - 127+ Google Reviews - Join 127+ homeowners since 2020.

★★★★★

AC stopped cooling on a Saturday in August - 92 degrees inside by noon. Called AIRONE at 10am, technician was here by 1pm. Capacitor had failed on the outdoor unit. He had the part on the truck, fixed it in 45 minutes. $89 diagnostic applied toward the repair. The whole thing was done before 2pm. That's exactly what you need in an emergency.

Kevin R., Glendale - AC Not Cooling Repair - Same Day - via Google Reviews
★★★★★

Another contractor told me I needed a new compressor for $2,400. Called AIRONE for a second opinion. They diagnosed it as a failed contactor - $280 repair. Fixed in the same visit. I almost spent $2,400 for a $280 fix. Get a second opinion before committing to any expensive AC repair.

Diane M., Torrance - AC Not Cooling - Second Opinion - via Google Reviews
★★★★★

Called during the July heat wave - it was 104 degrees in Pasadena and the AC had been running for 8 hours without cooling the house below 85. AIRONE diagnosed a refrigerant leak, repaired it, and recharged the system the same day. They explained exactly what was leaking and why, and told me what it would cost if it leaked again. Straightforward, honest, fast.

Thomas B., Pasadena - AC Not Cooling - Refrigerant Leak Repair - via Google Reviews
★★★★★

I manage rental properties in Long Beach and one of my tenants called saying the AC was running but not cooling. AIRONE diagnosed a dirty condenser coil - coastal air deposits in a unit two blocks from the water. Professional coil cleaning, same day. Written service report I could file with the property records. Exactly what a property manager needs.

Sandra W., Long Beach - AC Not Cooling - Coastal Coil Cleaning - via Google Reviews
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Frequently Asked Questions

AC Not Cooling Los Angeles - Frequently Asked Questions

An AC that runs but does not cool has one of several root causes: low refrigerant from a system leak, a frozen evaporator coil, a failed run capacitor, dirty condenser coils, a failed contactor, ductwork leaks, or compressor failure. The most common cause in the Los Angeles area is a failed run capacitor or low refrigerant. Before calling a technician, check that your thermostat is set to COOL mode (not FAN only) and that your air filter is not clogged - both are free fixes that take under two minutes. If neither resolves the issue, the system requires a professional diagnostic. AIRONE diagnoses AC not cooling same-day across Los Angeles County, South Bay, and Orange County. $89 diagnostic. Call (323) 471-1037.
Warm air from a running AC is typically caused by one of five things: a failed run capacitor preventing the compressor from starting (blower runs, compressor doesn't); low refrigerant preventing heat transfer; a frozen evaporator coil blocking airflow; dirty condenser coils reducing heat rejection; or the thermostat set to FAN mode rather than COOL. Checking the thermostat and air filter are the two free self-fixes available before calling a technician. For all other causes, a professional diagnostic is required. In Southern California, capacitor failure and refrigerant leaks are the two most common causes based on the region's extended 7 to 9 month cooling season that places higher wear on electrical components.
An air conditioner runs without cooling when the cooling cycle is incomplete. The blower circulates air through the system, but one of the following prevents heat transfer from occurring: (1) the compressor fails to start due to capacitor or contactor failure, leaving the blower as the only running component; (2) low refrigerant reduces the system's heat absorption capacity; (3) ice on the evaporator coil blocks airflow; (4) dirty condenser coils prevent heat rejection to outside air; (5) ductwork leaks route conditioned air to unconditioned spaces before it reaches the living areas. Each cause has a distinct symptom pattern and a different repair cost. Professional diagnosis with a refrigerant manifold gauge and electrical meter is required to confirm root cause.
Before calling for AC repair, check four things in order: (1) Thermostat mode - set to COOL, not FAN. The setpoint should be at least 3 degrees below current room temperature. Replace thermostat batteries if the screen is dim or blank. (2) Air filter - pull it out and hold it to light. If you cannot see light through it, replace it immediately. A $10 filter from any hardware store. (3) Outdoor unit - walk outside and confirm the condenser fan is spinning. Silence or humming without fan movement indicates capacitor failure. (4) Refrigerant lines - touch the larger insulated copper line running from the outdoor unit. Ice or heavy frost indicates a frozen coil or refrigerant issue. If all four check out and the system still is not cooling, call (323) 471-1037.
Yes - a clogged air filter is one of the most common causes of AC not cooling and is the first thing to check before calling a technician. A dirty filter restricts airflow across the evaporator coil. When airflow drops below a threshold, the coil temperature falls below freezing, ice forms on the coil surface, and the system cannot transfer heat from the return air to the refrigerant. The result is warm or barely-cool air from the vents despite the system running continuously. Replace the filter and run the system in FAN-ONLY mode for one to two hours to thaw the coil before switching back to COOL. If the system refreezes after replacing the filter, the root cause is something else - typically low refrigerant.
Ice on the refrigerant lines - the two copper tubes running from the outdoor unit into the home - indicates that the evaporator coil inside the air handler has frozen. A frozen coil blocks airflow and prevents cooling. It is caused by one of three things: a clogged air filter reducing airflow, low refrigerant causing coil temperature to drop below freezing, or a dirty evaporator coil restricting heat transfer. Do not turn the system OFF when you see ice - turn it to FAN ONLY mode. This runs the blower without the compressor and thaws the coil with room-temperature air, typically in one to four hours. After thawing, replace the air filter and switch back to COOL. If the coil freezes again within a few hours, you have a refrigerant leak that requires a licensed technician.
Repair cost depends entirely on the diagnosis. The AIRONE diagnostic fee is $89, applied toward the repair if you proceed. Common repair costs: capacitor replacement $150–$400; contactor replacement $200–$400; condenser coil cleaning $150–$300; evaporator coil cleaning $200–$500; refrigerant leak repair and recharge $350–$1,200; ductwork leak repair $300–$800; compressor replacement $1,200–$2,800. The $89 diagnostic is the only way to know which problem you have - a contractor who quotes a specific repair cost before diagnosing the system has not actually diagnosed it. AIRONE provides a written flat-rate repair quote before any work begins.
In most cases, yes - repairing is worth it unless the system meets specific replacement criteria. Repair is clearly the right choice when the system is under 10 years old, uses R-410A refrigerant, the repair cost is under $800, and the system has no history of repeated repairs. Replacement is worth considering when the system uses R-22 refrigerant (discontinued in 2020, now expensive to service), when the system is over 12 years old and facing compressor failure, or when repair cost plus age times annual operating cost exceeds $5,000 per the Consumer Reports replacement rule. AIRONE provides both repair and replacement cost figures at every diagnostic visit so you can make the comparison directly.
Refrigerant recharge alone costs $150–$400 in Los Angeles depending on the amount needed and refrigerant type. However, a recharge without a leak repair is not a complete fix - refrigerant does not deplete naturally. If your system is low on refrigerant, there is a leak. The total cost of leak diagnosis, repair, and recharge ranges from $350 to $1,200 depending on leak location and complexity. AIRONE performs EPA Section 608 compliant refrigerant recovery, leak repair, and recharge as a single service. Any contractor who offers to simply recharge your refrigerant without diagnosing and repairing the leak is providing an incomplete fix.
A run capacitor is an electrical component that provides starting and running power to the compressor and condenser fan motor. When it fails, the compressor cannot start and the system runs without cooling - the blower pushes uncooled air through the vents. Capacitor replacement costs $150 to $400 in Los Angeles including parts and labor. AIRONE technicians stock capacitors for all major residential AC brands and can complete most capacitor replacements on the first visit. It is one of the most common AC repairs in Southern California due to the region's extended cooling season.
No - adding refrigerant to an AC system is restricted by federal law. Under EPA Section 608, purchasing refrigerant in quantities above two pounds and handling refrigerant in HVAC systems requires EPA Section 608 certification. Adding refrigerant yourself is also ineffective without first diagnosing and repairing the leak causing the low refrigerant condition - the refrigerant will simply leak out again. AIRONE technicians hold the required EPA certifications and perform all refrigerant work in compliance with Section 608 requirements.
AC cooling unevenly - some rooms cold, others warm - typically indicates ductwork leakage rather than a refrigerant, capacitor, or coil issue. According to the US Department of Energy, duct leakage wastes 20 to 30% of conditioned air in a typical home. Conditioned air escapes into the attic or crawl space before reaching the farthest rooms from the air handler, which are almost always the warmest. If your central AC cools well near the air handler but underperforms in distant rooms or on upper floors, a ductwork inspection is the appropriate diagnostic - not a refrigerant recharge. AIRONE performs static pressure ductwork testing to quantify leakage.
Sudden AC failure - cooling one day, not cooling the next - typically indicates an electrical component failure rather than a gradual degradation issue. The most common causes of sudden AC failure: capacitor failure (outdoor unit hums but fan does not spin); contactor failure (outdoor unit does not activate at all); blown fuse or tripped breaker on the AC circuit; thermostat failure or misconfiguration; or compressor thermal shutoff due to overheating. Gradual causes like dirty coils or low refrigerant typically develop over days to weeks - if the system was cooling well yesterday and is not cooling today, check the breaker and thermostat first, then call AIRONE at (323) 471-1037 for a same-day diagnostic.
AC not cooling means the system is running - the blower circulates air, the outdoor unit may or may not be operating - but the air coming from the vents is not cold. AC not working at all means no air movement at all from supply vents and no apparent system operation. The causes differ significantly: AC not cooling typically involves the compressor circuit (capacitor, contactor, refrigerant, coils); AC not working at all typically involves power supply (tripped breaker, blown fuse, control board, or thermostat signal failure). Both require professional diagnosis. Call (323) 471-1037 for same-day service either way.
AC failure specifically during heat waves or extreme temperature days has three common causes: (1) The system is adequately sized for average conditions but undersized for peak-heat design temperatures - it runs continuously but cannot remove heat fast enough when outdoor temperatures exceed 100 to 105 degrees Fahrenheit. (2) Electrical stress: heat waves in Los Angeles create peak demand events on LADWP and SCE circuits, causing voltage fluctuations that can trip capacitors and compressor thermal protection. (3) The heat itself accelerates the failures already developing in aging capacitors, contactors, and refrigerant circuits - a system that was marginal in normal conditions fails during peak stress. If this pattern repeats across multiple heat events, schedule a diagnostic before the next heat season rather than waiting for failure.
AC that cools but not adequately - house reaches 80 degrees when thermostat is set to 72 - is a related but distinct problem. Possible causes: system undersized for heat load or poor insulation (not a repair issue); partially failed capacitor allowing compressor to start but reducing efficiency; low refrigerant with a slow leak (gradual degradation); dirty condenser or evaporator coils reducing heat transfer efficiency; or ductwork leakage reducing effective airflow to living spaces. The diagnostic approach is the same - $89 AIRONE diagnostic - but the repair path may differ from a complete not-cooling failure.
Yes - same-day AC diagnosis and repair is available across most of Los Angeles County, South Bay, and Orange County. When you call (323) 471-1037, a live AIRONE dispatcher confirms same-day availability in your specific city. AIRONE service appointments are available Monday through Saturday 7:00 AM to 7:00 PM. For emergency AC calls - including AC not cooling during a heat advisory - AIRONE provides 24-hour emergency dispatch 7 days a week. No voicemail. No answering service. A live dispatcher answers every call.
Yes - AIRONE diagnoses and repairs all major residential AC brands including Carrier, Trane, Lennox, Rheem, Goodman, Daikin, York, Mitsubishi, Fujitsu, American Standard, Bryant, Amana, Heil, and Coleman across all system types: central split systems, package units, mini splits, and ductless systems. AIRONE technicians stock capacitors and contactors for the most commonly installed residential AC brands in the LA market to enable same-visit repairs on the most frequent failure types.
AIRONE provides same-day AC not cooling diagnosis and repair near you across 120+ cities in Los Angeles County, South Bay, and Orange County. Call (323) 471-1037 to confirm service availability in your specific city - confirmation takes 30 seconds. AIRONE offers same-day and next-day scheduling across most of the service territory. CA License #114807, C-20 certified. For emergency AC repair near you, AIRONE provides 24-hour dispatch 7 days a week. Flat-rate pricing - the price on the diagnostic quote is the price on the invoice.
Replace rather than repair when any of these is true: the system uses R-22 refrigerant and has a significant repair need (R-22 is discontinued and expensive to service); the repair cost exceeds 50% of the replacement cost; the system is 12 or more years old and facing compressor failure; or per Consumer Reports, when repair cost plus the system's age in years times annual operating cost exceeds $5,000. In all other cases - younger system, R-410A refrigerant, repair cost under $800 - repair is almost always the right call. AIRONE provides both the repair quote and the replacement cost estimate at every diagnostic visit so you can compare directly before deciding.
AC that cools well during the day but stops cooling effectively at night has three distinct causes that differ from daytime not-cooling problems. First, warm air stratification: heat rises and accumulates near the ceiling throughout the day. At night, the thermostat is at the same height it was during the day, but the air near the ceiling - where occupants feel it least and the system reads it last - is significantly warmer than the thermostat reports. The system runs correctly but the thermal distribution in the room makes it feel ineffective. Second, condenser heat retention: the outdoor condenser unit absorbs radiant heat from the roof, walls, and surrounding concrete throughout the day. After hours of direct sun exposure, the condenser's ambient temperature can be 10 to 20 degrees Fahrenheit higher than the outdoor air temperature, reducing its ability to reject heat efficiently even as the air temperature drops at night. This is particularly common with rooftop-mounted package units and south- or west-facing condenser locations in Southern California. Third, thermostat programming: a scheduled setpoint increase in the evening - sometimes programmed during a previous energy-saving effort and forgotten - causes the system to reduce cooling output at the exact time occupants expect it to maintain comfort. Check the thermostat's schedule and override any evening setback if nighttime cooling is the priority. If the system ran well last summer but is underperforming at night this season, the condenser heat retention issue combined with an aging capacitor is the most common LA-market explanation. AIRONE diagnoses same-day. Call (323) 471-1037.
AC cooling the lower floor adequately but failing on the upper floor or second floor is a duct and airflow problem, not a refrigerant or capacitor problem. Three causes account for the overwhelming majority of upper-floor not-cooling complaints in the Los Angeles market. First, duct length and friction loss: supply ducts serving upper floors are longer than those serving lower floors. According to the US Department of Energy, duct leakage and friction losses can reduce delivered airflow to distant rooms by 20 to 30% - upper-floor rooms at the end of long duct runs receive significantly less conditioned air than rooms near the air handler. Second, insufficient return air on the upper floor: if the upper floor has supply vents but inadequate return air grilles, pressure builds up and airflow stalls regardless of how hard the system runs. Balanced supply and return airflow is a Manual D duct design requirement - many older homes have this imbalance. Third, upper-floor heat load: heat rises and accumulates on upper floors. A system correctly sized for the whole home's average load may be undersized specifically for the upper floor's peak heat load, particularly on south- and west-facing upper-level rooms in SoCal's summer sun. The diagnostic implication: if a contractor diagnoses "low refrigerant" or recommends a refrigerant recharge for a system that cools well downstairs but not upstairs, seek a second opinion. Uneven floor-by-floor cooling is almost never a refrigerant issue. AIRONE performs static pressure ductwork testing to identify and quantify airflow imbalances. Call (323) 471-1037.
A failed run capacitor produces a specific, identifiable symptom pattern that distinguishes it from other AC not-cooling causes. The outdoor condenser unit makes a humming or buzzing sound but the fan on top of the unit does not spin. The blower inside the home continues to run normally and circulates air through the vents, but the air is not cool - because the compressor never starts without the capacitor providing its startup power. If you walk outside and observe the outdoor unit closely, you may see the condenser fan attempt to spin and fail, or spin briefly and stop. In some cases, the fan will spin briefly if manually pushed - a definitive sign of capacitor failure, though AIRONE does not recommend homeowners attempt this test. The outdoor unit may also shut off entirely after a short period as the thermal protection trips. A capacitor cannot be diagnosed by sight - the capacitor itself looks identical whether functional or failed. Confirming a failed capacitor requires a multimeter test that an AIRONE technician performs at the $89 diagnostic visit. Capacitor replacement costs $150 to $400 and is completed on the same visit in almost all cases. In Los Angeles and surrounding areas, capacitor failure is the single most common AC repair AIRONE performs - the region's 7 to 9 month cooling season places cycle counts on capacitors 2 to 3 times higher than the national average. Call (323) 471-1037 - if this symptom matches what you are experiencing, same-day repair is almost certainly available.
An AC that turns on, runs for 5 to 10 minutes, shuts off, and restarts repeatedly without ever bringing the house to the thermostat setpoint is short cycling - one of the most common AC complaints, and one that produces the same "running but not cooling" experience as the other causes on this page. Short cycling has four primary causes. First, an oversized system: when an AC system is too large for the home's actual heat load, it cools the air near the thermostat quickly and shuts off before the rest of the home has cooled - then restarts when the thermostat location warms again. According to ACCA, up to 50% of residential HVAC systems are incorrectly sized, and oversizing is the most common error. An oversized system also fails to remove adequate humidity, leaving the home feeling warm even when the air temperature is technically at setpoint. Second, a frozen evaporator coil: as the coil ices over, airflow drops until the system's pressure safety switch trips and shuts the unit off - then the coil partially thaws, the system restarts, and the cycle repeats. Third, low refrigerant: insufficient refrigerant causes the system to reach low pressure thresholds quickly, tripping the safety switch and shutting down in short cycles. Fourth, a thermostat placed near a heat source - a sunny window, a lamp, or a heat-generating appliance - causes it to read the local temperature rather than the room temperature, triggering rapid on/off cycling. Short cycling is not a normal operating condition. Left unaddressed, it accelerates compressor and capacitor wear significantly - the system endures start-up electrical stress multiple times per hour rather than running one or two longer cycles. AIRONE diagnoses the root cause of short cycling as part of the standard $89 diagnostic visit. Call (323) 471-1037.
If your AC was recently repaired and is still not cooling, the most likely explanations are: (1) the original diagnosis was incomplete - the component that was repaired was failing, but a second problem was also present and is now the limiting factor; (2) the repair addressed a symptom rather than the root cause - a refrigerant recharge without leak repair is the most common example, where the system is temporarily cold after recharging but the underlying leak causes progressive loss of cooling capacity within days to weeks; (3) a new component failure occurred during or after the repair - mechanical disturbance during service can occasionally trigger a failure in an adjacent aging component. What you should do: call (323) 471-1037 for a second-opinion diagnostic. AIRONE performs an independent $89 diagnostic that identifies the current root cause without assumption about what the previous technician found or repaired. The written diagnostic report documents the finding - which is important if you need to revisit the warranty terms with the original repair contractor. AIRONE will not assume the previous contractor was wrong, but will diagnose the system independently and tell you exactly what is preventing cooling right now. The Torrance review in Section 9 above is a direct example of this scenario: three contractors had previously assessed the system and recommended a $2,400 compressor - AIRONE's independent diagnostic identified a failed contactor as the actual cause, at a cost of $280. Do not pay for additional repairs without an independent second diagnosis first.
No - a brand new AC that is not cooling is not normal and requires immediate resolution. A newly installed AC should cool the home to the thermostat setpoint within the first operating cycle on any day within the system's rated capacity. The most common causes of post-installation not-cooling: incorrect refrigerant charge by the installing contractor (too little refrigerant leaves the system unable to transfer heat adequately - this is the most common post-install failure), incorrect thermostat wiring (the system appears to run but the cooling signal is not reaching the outdoor unit), a sizing error that becomes apparent on the first hot day (a system sized at the minimum capacity for the home's average heat load may be unable to maintain setpoint on peak summer days), or a duct connection issue at the unit that allows conditioned air to escape into the attic before reaching the living space. If your new system is under manufacturer warranty and was installed by a licensed contractor, the installing contractor has a warranty obligation to diagnose and correct the issue. AIRONE provides independent second-opinion diagnostics for post-installation not-cooling at the standard $89 fee - the diagnostic report documents the specific deficiency, which supports any warranty or quality-of-work claim you need to make with the original installer. Call (323) 471-1037.
A system that cooled adequately last summer but underperforms this season has typically experienced one of three gradual changes during the off-season. First, a slowly developing refrigerant leak: small leaks can go undetected for months, progressively reducing the refrigerant charge until summer heat loads expose the shortfall. The system cooled fine on mild spring days and even on moderate summer days - but when sustained temperatures above 95 degrees Fahrenheit arrive, the reduced refrigerant charge is no longer sufficient. Second, coil fouling accumulated over the off-season: condenser coils that were marginally dirty at the end of last summer accumulate additional smog deposits and biological growth during months of non-operation, reducing heat transfer efficiency enough to cause noticeable performance degradation on the first hot spell of the new season. Third, capacitor degradation: capacitors age continuously regardless of whether the system is running - an aging capacitor that was functional last summer may have degraded over winter to the point where it can start the compressor but cannot sustain full operating efficiency. The practical advice for this symptom: schedule AIRONE's $89 diagnostic in March or April - before peak summer heat - rather than waiting for a failure. A pre-season diagnostic catches developing refrigerant leaks, coil condition, and capacitor health before the problem becomes a same-day emergency in August. Call (323) 471-1037.
AC that cools well in the morning but underperforms or fails in the afternoon has a different root cause from the nighttime not-cooling pattern (see the at-night question above) - and it is one of the most common time-of-day complaints in Southern California. The primary cause is afternoon condenser heat loading. The outdoor condenser unit's job is to reject heat from the refrigerant to the outside air - it does this efficiently when outdoor air is cool, as it is in the morning. As the afternoon progresses, the condenser unit absorbs radiant heat from direct sun exposure (particularly on south- and west-facing installations), from hot concrete or pavement surfaces, and from the warming air itself. By mid-afternoon, the condenser's surrounding ambient temperature can be 15 to 25 degrees Fahrenheit higher than the outdoor air temperature reading, severely limiting how efficiently it can reject heat. The system continues to run but its effective cooling capacity drops substantially. This pattern is most pronounced in the San Fernando Valley and other inland LA areas where afternoon temperatures regularly exceed 100 degrees Fahrenheit during summer. Contributing factors: an aging capacitor with reduced efficiency under heat stress, dirty condenser coils that compound the heat retention problem, or a system already running at its rated capacity limit on mild mornings that cannot compensate when afternoon thermal loads increase. A condenser shade structure can reduce afternoon heat loading - AIRONE can advise on positioning and feasibility during a diagnostic visit. If the system is more than 8 years old and shows this pattern, a comprehensive diagnostic including refrigerant charge verification, capacitor testing, and coil condition assessment is the right path. Call (323) 471-1037.
AIRONE charges a flat $89 diagnostic fee for every AC not cooling service call in Los Angeles, South Bay, and Orange County. This fee covers a complete diagnostic visit: the technician uses refrigerant manifold gauges, an electrical meter, and system knowledge to identify the root cause, and provides a written flat-rate repair quote before any work begins. If you approve the repair and proceed, the $89 diagnostic fee is applied toward the repair cost - you do not pay it separately. The $89 is charged regardless of whether you proceed with the repair. Why a diagnostic fee matters: a contractor who does not charge a diagnostic fee is either rolling the diagnostic cost into the repair quote (making it impossible to compare prices on the actual repair), quoting a repair before diagnosing (meaning they have not actually diagnosed your system), or has a business model dependent on upselling repairs - which is the most common reason for misdiagnosis in the residential HVAC market. AIRONE's flat-rate diagnostic ensures the diagnosis is complete and independent of any repair decision. Call (323) 471-1037.
Home warranties typically cover some AC component failures - but whether a specific failure is covered, and how quickly coverage actually translates to a repair, varies significantly by warranty policy. Most home warranty policies cover mechanical failure of covered components including the compressor, motors, and some electrical components. Most policies exclude refrigerant recharge (classified as a maintenance item rather than a mechanical failure) and pre-existing conditions. The practical reality in Los Angeles: home warranty AC claims require the warranty company to assign an approved contractor, which typically takes 48 to 72 hours - and sometimes longer during peak summer periods when contractor availability is tight. The assigned contractor may not be available for same-day service even after assignment. If your AC has stopped cooling during a heat event - particularly one that has triggered an official heat advisory - the 2 to 3 day warranty process may not be acceptable given the habitability conditions. In that situation, calling AIRONE for same-day service and then submitting the repair documentation to your warranty company for reimbursement review is often the faster and more effective path. AIRONE provides a detailed written service report that includes the diagnosis, parts replaced, and labor performed - the documentation format most home warranty companies accept for reimbursement review. Call (323) 471-1037 to discuss your specific situation.
Same-Day AC Diagnosis - $89 Flat Rate, Applied Toward Repair

AC Running But Not Cooling? Same-Day Diagnosis Available.

AIRONE diagnoses AC not cooling same-day across Los Angeles County, South Bay, and Orange County. The cause is one of ten problems - each has a known fix at a known cost. The $89 diagnostic tells you exactly what is wrong and what it costs to repair, before any work begins.

If another contractor has already given you a repair quote - especially for something expensive like a compressor - call (323) 471-1037 for a second opinion. AIRONE technicians diagnose independently and will confirm or contradict the first quote in writing. The review from Torrance above (Section 9) was a $2,400 compressor quote that turned out to be a $280 contactor.

AIRONE is a California State License Board verified HVAC contractor - CA License #114807, C-20 certified, serving Los Angeles County, South Bay, and Orange County since 2020.

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