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. $279 minimum labor on approved repair work.
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. $279 minimum labor applies only to approved repairs. Call (813) 343-2212 for same-day Tampa Bay service.
7 Common Causes, Ranked
1. Clogged Air Filter
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
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
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
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)
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
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
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.
What to Do Right Now
- Go through causes 1-3 yourself (filter, thermostat, breaker). Takes 5 minutes total.
- If AC is frozen, turn it off immediately and set fan to ON for 2-3 hours.
- Check the outside unit — if coils look dirty or unit isn’t spinning, move to step 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 minimum labor 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.
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 minimum labor 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.
AC Not Cooling? Call Now.
Same-day Tampa Bay service. Licensed CAC1819196. $279 minimum includes diagnosis. No surprise fees.