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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.

AC running but not cooling? We test the refrigerant, capacitor and compressor on one visit and quote the fix before any work starts.

Home Therapist serves Tampa Bay, Florida. In the area? FREE estimates and FREE diagnosis.

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At a glance

Check first
Air filter, thermostat on COOL and AUTO, and the outdoor unit breaker
Ice on the lines
Turn the AC off and run the fan 2 to 3 hours; call if it freezes again
Capacitor or contactor
$279 each
Refrigerant leak repair
$1,098 plus refrigerant; finding the leak is FREE
Coil or compressor
$1,198 labor (coil) or $1,248 labor (compressor), plus the part
Refrigerant (R-410A)
$285 for up to 3 lbs, or $95 per lb when it takes more than 3 lbs
Do not
Keep running the AC while the coil is frozen
Diagnosis
FREE at any hour, no diagnostic fee
Richard Morales

Reviewed by Richard Morales, Co-Owner & FL Class B Air Conditioning Contractor (FL license CAC1819196)Updated Oct 8, 2026

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) start at $1,198 labor (coil) or $1,248 labor (compressor), plus the part and refrigerant. 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. 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 find the leak (the basic search is FREE with the diagnosis), seal or replace the component, then recharge (R-410A is $285 for up to 3 lbs, or $95 per lb when it takes more than 3 lbs). Leak repairs are $1,098 at the air handler, line set or outdoor unit (line flush and new filter drier included), plus the refrigerant.

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 ($1,248 labor plus the compressor and refrigerant) can cost a large share 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 Type Tampa Low Tampa High What’s Included
Capacitor replacement $279 $349 New dual-run or start capacitor, tested under load
Refrigerant recharge (R-410A) $285 up to 3 lbs or $95 per lb when it takes more than 3 lbs Refrigerant added; does not include leak repair
Refrigerant leak repair (leak search FREE with our diagnosis) $1,098 $1,098 Brazed repair, line flush and new filter drier after our FREE electronic leak search; refrigerant extra
Condenser coil cleaning $279 $279 Chemical flush, rinse, coil fin straightening
Evaporator coil replacement $1,198 $1,348 under warranty Labor, line flush and new filter drier; coil and refrigerant extra
Compressor replacement $1,248 $1,398 under warranty Labor, line flush and new filter drier; compressor and refrigerant extra
Full system replacement (3-ton Goodman Value) $7,459 $7,884 New system, install and haul-off of old equipment; permit fee billed separately

FREE diagnosis on every call. 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. 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 before a homeowner notices anything wrong.

Rinsing the condenser coil on a rooftop AC in Madeira Beach, FL 33708.
Rinsing the condenser coil on a rooftop AC in Madeira Beach, FL 33708.

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.

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. Most Tampa AC no-cool repairs fall into: simple fixes ($279 each: capacitor, contactor, relay, drain flush), mid-level (motor replacement: $499 labor for a condenser fan motor or $599 labor for a blower motor, plus the motor), or major (refrigerant leak, compressor, coil, copper line replacement: a copper leak repair is $1,098, a coil $1,198 labor and a compressor $1,248 labor, plus the part and refrigerant). See full breakdown on our AC repair pricing page.

An outdoor AC unit opened up with a new capacitor mounted in Tampa, FL 33624.
An outdoor AC unit opened up with a new capacitor mounted in Tampa, FL 33624.

What Tampa Bay customers say

“Great Team. Arrive on Time and do complete maintenance on our system. Recommend to anyone looking for quality service.”
Richard M., Google review
“They have been amazing from the quote to the installation. They were able to accommodate us last minute. Made all the updates needed and in less than 5hrs we had a new HVAC unit installed. We'll be using them for all of our upgrades”
Rona B., Google review

4.8 from 1,398 reviews · Read more reviews

Frequently Asked Questions

  • Why would my AC be running but not cooling?

    The most common reasons an AC runs but does not cool are a dirty air filter blocking airflow, a frozen evaporator coil, low refrigerant from a leak, a failed capacitor preventing the compressor from starting, or a clogged condensate drain. Home Therapist offers FREE diagnosis on every visit to pinpoint the exact cause. Call (813) 343-2212.

  • Is no AC considered an emergency in Florida?

    A complete AC failure in Tampa Bay's heat and humidity is widely treated as an urgent health and safety matter. Tenants should notify landlords in writing immediately. Homeowners should call a licensed HVAC contractor the same day. Home Therapist provides same-day service and FREE diagnosis. License CAC1819196.

  • Why is my AC not cooling in 100 degree weather?

    During extreme heat, an AC system is most likely to fall short because it is undersized for the load, the refrigerant charge is low, the condenser coils are dirty and cannot reject heat, or the air filter is clogged. Tampa Bay's high humidity adds latent load that makes all of these problems worse. A FREE diagnosis from Home Therapist identifies which issue is causing the shortfall. Call (813) 343-2212.

  • What is the 3 minute rule for AC?

    The 3 minute rule means waiting at least 3 minutes before restarting your AC after shutting it off. This delay lets refrigerant pressure equalize, protecting the compressor from damaging stress. Skipping this step, especially during Tampa Bay's intense summer heat, can shorten compressor life significantly.

  • Do air conditioners use Freon?

    Older AC systems use R-22 refrigerant, commonly called Freon, but it has been phased out in the US since 2020. Most modern systems use R-410A or newer R-32 and R-454B refrigerants. If your older unit needs a refrigerant recharge, replacement is often the smarter long-term choice.

  • Why is my AC blowing air but not getting colder?

    The most common causes are a dirty air filter restricting airflow, a frozen evaporator coil, low refrigerant from a leak, or a failing compressor. Tampa Bay's salt air near the coast accelerates coil and component corrosion. Home Therapist offers FREE diagnosis on every visit so you know exactly what is wrong before any work begins. Call (813) 343-2212.

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 a compressor replacement is $1,248 labor plus the compressor and refrigerant. 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 $285 for up to 3 lbs in our price book, or $95 per lb when it takes more than 3 lbs. Most Tampa homes need 2-4 pounds for a recharge after leak repair. Note: R-410A is being phased out, new systems use an A2L refrigerant (R-32 or R-454B, depending on the brand). 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 (quoted after a FREE inspection) 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 to $799 installed 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 are open 24 hours, 7 days a week. (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 to $9,425 installed; Goodman Premium $8,397 to $11,520. The Elite tier (Goodman GZV6S or Daikin DH6VS) runs $13,022 to $18,540. The permit fee is billed separately.

Do you give free AC diagnosis?

Yes. The diagnosis is FREE at any hour, with no diagnostic fee and no trip charge. 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 refrigerant is $285 for up to 3 lbs, or $95 per lb when it takes more than 3 lbs. A2L refrigerants like R-32 and R-454B are 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

Where we work

We serve the three counties of Tampa Bay from our shop at 1408 W Linebaugh Ave in Tampa.

Hillsborough County

Tampa, Brandon, Riverview, Carrollwood, Town ’n’ Country, Plant City, Ruskin, Sun City Center, Apollo Beach, Valrico, Lutz, Seffner

Pinellas County

St. Petersburg, Clearwater, Largo, Dunedin, Oldsmar, Safety Harbor, Pinellas Park, Seminole, Tarpon Springs, Treasure Island, St. Pete Beach

Pasco County

Wesley Chapel, Land O’ Lakes, New Port Richey, Holiday, Hudson, Trinity, Zephyrhills, Dade City

See every city and ZIP code we serve

AC Not Cooling? Call Now.

Same-day Tampa Bay service. Licensed CAC1819196. FREE diagnosis. No surprise fees.

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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 Hillsborough, Pinellas and Pasco counties with a four-technician field team and 1,300+ customer reviews averaging 4.8 stars.

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