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Troubleshooting Guide

Why Is My AC Not Cooling? 7 Tampa-Specific Causes

AC running but house not getting cold? In Tampa Bay’s 90+ degree summers this goes from annoyance to emergency fast. Below are the 7 most common causes we see on service calls, which ones you can check yourself in 5 minutes, and when to bring in a licensed tech. Home Therapist: CAC1819196, FREE estimates + FREE diagnosis. Flat-rate pricing on every approved repair.

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Quick Answer

If your AC is running but not cooling in Tampa, it’s almost always one of 7 things: a clogged air filter, wrong thermostat setting, tripped outside-unit breaker, frozen evaporator coil, low refrigerant from a leak, dirty condenser coils, or a failing compressor. DIY checks take 5 minutes. Most real repairs run $279-$849 (capacitor, contactor, motor) and major repairs (compressor, coil replacement) run $649-$1,900. Our diagnosis is FREE, no diagnostic fee, ever. Flat-rate pricing on every approved repair. Call (813) 343-2212 for same-day Tampa Bay service.

7 Common Causes, Ranked

1. Clogged Air Filter

DIY possible

Symptom: Weak airflow at vents, air blows cool but not cold, unit runs constantly.

Likelihood in Tampa: Extremely common (30% of no-cool calls). Tampa humidity clogs filters fast.

Pull the filter and check light through it. If you can’t see light, replace it. Use MERV 8-11 for best airflow/filtration balance. Should be replaced every 30-60 days in Tampa.

2. Thermostat Set Wrong

DIY possible

Symptom: Fan runs constantly but AC isn’t cycling, or mode set to “heat” or “off.”

Likelihood in Tampa: Common after a power outage or kids/guests messing with it.

Set mode to COOL, fan to AUTO (not ON), and temperature 3-5° below current room temp. Wait 10 min. If no cold air, move on to the next cause.

3. Outside Unit Breaker Tripped

DIY possible

Symptom: Inside fan blows air but outside condenser unit isn’t spinning. Only room-temp air comes out.

Likelihood in Tampa: Common after Tampa thunderstorms (power surges trip breakers).

Check your electrical panel for a tripped 30-50 amp AC breaker (will be labeled). Reset firmly. Also check the disconnect box near the outside unit. If it trips again immediately, stop and call a tech.

4. Frozen Evaporator Coil

Call a tech

Symptom: Ice visible on copper lines at outside unit, water dripping from air handler, no cold air.

Likelihood in Tampa: Common in Tampa after a filter clog or refrigerant issue. Humidity speeds it up.

Turn AC OFF completely and run fan only for 2-3 hours to let ice melt. Do not run AC while frozen, you’ll burn out the compressor. Once thawed, if it freezes again, call a tech. Refrigerant leak is likely.

5. Low Refrigerant (Leak)

Call a tech

Symptom: Runs constantly, cold air but not cold enough, bills spiking, ice forming, hissing sound near unit.

Likelihood in Tampa: Common in Tampa homes 8+ years old. Coil corrosion + salt air accelerates leaks.

Licensed tech required. We inject UV dye ($449), find the leak, seal or replace the component, then recharge ($95/lb for R-410A). Most leak repairs run $399-$599 total.

6. Dirty Condenser Coils

DIY possible

Symptom: Outside unit visibly covered in grass, leaves, cottonwood fluff, or pet hair. Unit struggling on hot days.

Likelihood in Tampa: Very common. Tampa yards + oak pollen = clogged outdoor coils.

Gently rinse the outside unit with a garden hose (top down, not pressure washer). If still poor cooling, professional coil cleaning runs $279.

7. Failing Compressor

Call a tech

Symptom: Outside unit humming loudly but not spinning, or clicking/buzzing. May trip breaker. No cold air at all.

Likelihood in Tampa: Less common but terminal if true. Usually on 12+ year old Tampa systems.

Compressor replacement ($649-$1,900+) often costs 40-60% of a new system. We’ll give you a straight repair-vs-replace recommendation at the diagnosis.

Florida Code Corner: Permits and Refrigerant Rules

Any repair or replacement that involves refrigerant handling requires a contractor holding a Florida CAC (Certified Air Conditioning) license under FL Statute 489.105. Homeowners cannot legally purchase or handle EPA-regulated refrigerants. A full system replacement — compressor, condenser, air handler, or refrigerant line replacement — requires a mechanical permit pulled through Hillsborough County Development Services (the Land Use Hub at 601 E Kennedy Blvd). Work performed without a permit must be disclosed at real estate closing and can void your homeowner’s insurance claim if a related loss occurs. Home Therapist holds CAC1819196 and pulls all required permits on qualifying work.

AC Not Cooling Repair Costs in Tampa (2026)

Close-up of HVAC components with spray bottle in St. Petersburg, FL 33703.
HVAC Components in St. Petersburg, FL 33703
Cleaning AC evaporator coils during maintenance in Tampa, FL 33626.
AC Coil Cleaning in Tampa, FL 33626
Repair TypeTampa LowTampa HighWhat’s Included
Capacitor replacement$279$349New dual-run or start capacitor, tested under load
Refrigerant recharge (R-410A, per lb)$95/lb$120/lbRefrigerant added; does not include leak repair
Refrigerant leak detection and repair$449$849Electronic leak detection, brazed repair, recharge
Condenser coil cleaning$149$279Chemical flush, rinse, coil fin straightening
Evaporator coil replacement$899$1,499New coil, nitrogen pressure test, recharge
Compressor replacement$1,200$2,200OEM or equivalent compressor, labor, refrigerant
Full system replacement (3-ton, mid-grade Goodman or Daikin)$5,800$9,400New system, permit, install, haul-off of old equipment

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Licensed CAC1819196 (HVAC)  |  CFC1431159 (Plumbing)  |  1,300+ Five-Star Reviews

FREE diagnosis on every call. $279 minimum labor on approved repairs. Written estimate before any work begins.

Tampa Seasonal Timing: When “Not Cooling” Calls Peak

Tampa’s worst not-cooling calls land in two tight windows. The first is late May through mid-June, when overnight lows are still mild but afternoons hit 93 to 96 degrees — compressors that limped through winter finally give out under the first sustained heat load. The second spike is mid-August through early September, after the rainy season has pushed systems hard for three straight months with average humidity above 74 percent. Dirty condenser coils are the single biggest culprit in both windows: Tampa’s combination of spring oak pollen and summer thunderstorm debris packs coil fins faster than in drier climates, cutting heat rejection by 15 to 20 percent before a homeowner notices anything wrong.

Maintenance Schedule to Keep Your AC Cooling

  • February (pre-pollen): Replace the air filter before Tampa’s oak pollen season peaks. A clean filter heading into pollen season protects both the blower wheel and the evaporator coil from fouling.
  • March or April: Have the capacitor tested and document the microfarad reading. A capacitor below 90 percent of rated value in April will not survive the June heat load.
  • April or May (pre-season): Schedule a condenser coil cleaning. Coils packed with a winter’s worth of pollen and debris cannot reject heat efficiently in July and August when the system needs full capacity.
  • Monthly May through October: Pour one cup of diluted white vinegar into the condensate drain access cap near the air handler to prevent the drain clogs that cause the system to shut itself off on the hottest days.
  • After every major thunderstorm: Listen for the outdoor unit to start normally on the next call. Tampa’s June-September storm season produces the surge events that kill capacitors and contactors between tune-up visits.
Sound familiar? Get a FREE Tampa Bay diagnosis today. Call (813) 343-2212 Book Online

What to Do Right Now

  1. Go through causes 1-3 yourself (filter, thermostat, breaker). Takes 5 minutes total.
  2. If AC is frozen, turn it off immediately and set fan to ON for 2-3 hours.
  3. Check the outside unit, if coils look dirty or unit isn’t spinning, move to step 4.
  4. Call Home Therapist at (813) 343-2212. Same-day service across Tampa, Brandon, Clearwater, St. Pete, and every city we cover.

What Does This Fix Cost in Tampa?

FREE diagnosis and estimate. $279 applies only if you approve the repair, no separate trip charge. Most Tampa AC no-cool repairs fall into: simple fixes ($279-$349: capacitor, contactor, relay, drain flush), mid-level ($399-$849: motor replacement, refrigerant leak repair), or major ($649-$1,900: compressor, coil, copper line replacement). See full breakdown on our AC repair pricing page.

Get a FREE Diagnosis From a Licensed Tampa Bay Tech

No diagnostic fee. No trip charge. We tell you exactly what is wrong and what it costs before you approve anything.

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Frequently Asked Questions

Why is my AC blowing warm air?

In Tampa, warm air from a running AC usually means one of: outside unit not running (tripped breaker), low refrigerant, frozen coil, or a dirty filter choking airflow. Start with the thermostat and filter, then check the outside unit. If none of those work, call us.

How long can I run my AC with a bad capacitor?

Don’t. A failing capacitor strains the compressor, and Tampa compressor replacements run $649-$1,900+. A capacitor replacement is $279. Get it fixed when symptoms start (AC slow to start, humming, not cooling well).

Will a dirty filter really stop my AC from cooling?

Yes. A clogged filter restricts airflow, which can freeze the evaporator coil and completely stop cooling. In Tampa humidity this happens faster than other climates. Check your filter monthly.

How much does refrigerant cost in Tampa?

R-410A refrigerant is about $95 per pound in our pricebook. Most Tampa homes need 2-4 pounds for a recharge after leak repair. Note: R-410A is being phased out, new systems use R-454B. If your system is from before 2025, you’re still on R-410A.

Why is my AC running but not cooling my upstairs?

Almost always a ductwork or zoning issue. Tampa homes with bonus rooms or upstairs additions often have undersized return air ducts. Fixes range from duct sealing ($279) to adding a Honeywell or Daikin zone system ($2,599-$4,999).

Is it the thermostat or the AC?

Quick test: set thermostat 3° below room temp and wait. If outdoor unit doesn’t kick on within 2 minutes and breaker is fine, it’s likely the thermostat (bad wiring or failing unit) or a control board issue. Thermostat replacements run $349-$899 depending on model.

Can I fix a frozen AC myself?

You can melt the ice (turn AC off, run fan 2-3 hrs), but if it freezes again, there’s an underlying cause (dirty filter, dirty coils, low refrigerant, or failing blower) that needs a tech.

How fast can Home Therapist get to my AC?

Same-day service across Tampa, St. Petersburg, Clearwater, Brandon, Riverview, Wesley Chapel, and every city in Tampa Bay. We dispatch live, not through an answering service. (813) 343-2212.

When should I replace instead of repair?

If repair is more than 50% of replacement cost AND your system is 12+ years old, replace. A new Goodman Value system runs $6,643-$10,688 installed; Premium $8,397-$12,947; Daikin Elite $9,454-$15,406.

Do you give free AC diagnosis?

Our $279 flat-rate repair INCLUDES the full diagnosis and up to the first hour of work. We don’t do ‘free diagnosis then $500 for the repair’ bait-and-switch. You know the price before we start.

Does Tampa’s R-454B refrigerant transition affect my repair cost?

Yes, if your system uses R-410A (all units installed before January 2026) and needs a recharge, the cost is roughly $95 to $120 per pound. R-454B is used on new systems manufactured from 2026 forward. The two refrigerants are not interchangeable, so a technician matches refrigerant type to the existing system. Licensed CAC1819196.

My upstairs is 6 degrees warmer than downstairs. Is that a cooling problem or a duct problem?

Usually both. Heat rises in a two-story Tampa home and the second floor faces more roof radiant heat. A 3 to 5 degree difference is within normal range. Six or more degrees points to undersized return ducts on the second floor, leaking supply runs in the attic, or a refrigerant charge that is slightly low. A tech can measure static pressure and supply temps in 20 minutes to separate the two causes. Licensed CAC1819196.

How does oak pollen season in Tampa affect my AC’s ability to cool?

February through April, Hillsborough County live oak pollen is dense enough to visibly coat cars and clog 1-inch filters in two to three weeks instead of the usual 30 days. A loaded filter starves the blower of return air, drops the evaporator coil temperature below freezing, and causes warm air to blow as the frozen coil blocks airflow. Replace your filter every two to three weeks from February through May. Licensed CAC1819196.

Can I speed up a frozen coil thaw by switching to fan-only mode?

Yes. Set the thermostat to Fan Only (not Cool) and leave the blower running. Room-temperature air circulates across the frozen coil and typically clears the ice in 60 to 90 minutes. Do not run cooling mode while the coil is frozen — it strains the compressor and can cause a liquid refrigerant slug that damages the compressor. Replace the filter before restarting cooling mode. Licensed CAC1819196.

Related Problems

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Reviewed by Richard MoralesCo-Owner & FL Class B Air Conditioning Contractor, Home Therapist

Richard co-owns Home Therapist Cooling, Heating, and Plumbing and holds the FL Class B Air Conditioning Contractor license (CAC1819196) since 2017. The company holds licenses CAC1819196 (FL Class B AC Contractor, Richard Morales) and CFC1431159 (FL Plumbing Contractor, Alex Morales), serving the Tampa Bay metro with a six-technician field team and 1,378+ verified five-star reviews.

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