AC Problems in Tampa Bay Homes: Heat, Humidity and Storm Season

In Tampa Bay, your AC has two jobs: cooling the air and pulling moisture out of it, for most of the year. That makes clogged drain lines, overflowing drain pans, musty smells and a house that feels cool but clammy common problems here. Storm season adds power surges and flooded outdoor units. Here's what to check, and what repairs cost.

What makes Tampa Bay hard on an air conditioner?

Heat that lasts, humidity that rarely lets up, and a long storm season. These figures are from the National Weather Service office in Tampa Bay (Ruskin):

• Summer is long and steady. Tampa's normal summer (June through August, 1991 to 2020) has an average high of 90.9°F and an average low of 76.3°F (NWS Tampa Bay).
• Summer never needs heat. Those three summer months average 1,710 cooling degree days, and in records going back to 1890, Tampa has never logged a heating degree day in summer (NWS Tampa Bay).
• The rainy season is wet and humid. For most of west central Florida, it runs from about May 25 to October 10, with dew points staying above 70°F, lows in the 70s to around 80°, and highs in the upper 80s to mid 90s (NWS Tampa Bay).
• It rains a lot in summer. The normal June-through-August total is 24.15 inches (NWS Tampa Bay).
• Storms come almost daily. The weather service describes almost daily showers and thunderstorms over the peninsula in the rainy season, with frequent lightning (NWS Tampa Bay).
• Hurricane season runs June 1 through November 30, with a peak from about mid-August to mid-October (NWS Tampa Bay).

All that heat and moisture means your AC runs for months on end, and the indoor side is wet the whole time.

Why does humidity matter so much for your AC?

Your air conditioner removes moisture as it cools. Warm, damp air passes over the cold indoor coil, water condenses on it, and that water drips into a pan and runs out through a drain line. In a humid place, that's a lot of water, every day, for most of the year.

The University of Florida's extension service puts it plainly: because of the heat and humidity, most Florida residents rely on air conditioning both for comfort and to keep humidity down (UF Extension).

How humid should your home be? The EPA suggests keeping indoor humidity below 60%, and ideally between 30% and 50% (EPA). Above that, mold and mildew have an easier time.

What are the most common AC problems in Tampa Bay homes?

These are listed roughly from the simplest and most common to the more involved.

1. A clogged condensate drain line

This is one of the most common humid-climate problems. Algae, dust and gunk build up in the drain line until water backs up. Trane says a lack of maintenance will cause the AC drain line to clog with debris (Trane).

Signs: water around the indoor unit or furnace, a wet spot on a ceiling below an attic unit, or an AC that shuts itself off. Some systems have a safety switch that turns the AC off when water backs up, so a sudden shutdown on a muggy day can point to the drain.

The EPA's advice for preventing mold includes keeping AC drip pans clean and drain lines unobstructed and flowing (EPA).

2. An overflowing or rusted drain pan

The pan under the indoor coil catches the water. Trane notes that the pan can overflow when a condensate pump has come unplugged or the drain line is kinked or blocked (Trane). Years of standing water can also rust or crack a metal pan. Our guide to an AC leaking water inside covers leaks in more detail.

3. A house that's cool but clammy

If the thermostat says 76°F but the house feels sticky, the system may be cooling without removing enough moisture. The University of Florida's extension service explains that an air conditioner sized close to the home's actual load controls humidity better, because the coil spends more of its run time at its coldest, letting more water condense and drain away (UF Extension).

An oversized system cools the air quickly, shuts off, and leaves the moisture behind. UF Extension calls the result a home that is cool but clammy. It also notes that people often respond by lowering the thermostat, and that each degree lower can raise cooling bills by up to 8% (UF Extension).

UF Extension also cautions that many high-efficiency units remove less humidity, so a pro should check that a new system can handle your home's moisture load, not just its heat (UF Extension).

4. A musty smell

Trane says a musty smell usually means mold or mildew in the ductwork or indoor coil, and suggests checking the filter first and replacing it if it's dirty or wet (Trane). A wet coil and a slow drain give mold a place to grow.

5. A dirty indoor or outdoor coil

UF Extension notes that the indoor coil attracts dust because it's constantly wet during the cooling season (UF Extension). Outside, Carrier says a dirty outdoor coil leads to reduced efficiency, a lack of cool air and even compressor damage (Carrier).

6. Leaky ducts

Ducts in a hot attic that leak pull in hot, damp air. Tampa Electric says its duct program can save up to 20% on annual heating and cooling costs (Tampa Electric).

7. Storm and surge damage

Lightning, power surges, flooding and flying debris can all damage an AC. That gets its own section below.

What can you safely check yourself?

None of these steps need tools or opening the unit:

1. Turn the system off if water is overflowing. Keep water away from outlets, cords and the unit's wiring. If water has reached wiring, stay clear.
2. Check the filter. Replace it if it's dirty or damp. In a humid summer, check it more often.
3. Look at the drain line where it exits the house. It's usually a small PVC pipe near the outdoor unit or by the foundation. If it's dripping on a hot day, the line is probably flowing. If it's dry while the AC runs and there's water inside, it may be clogged.
4. Check the condensate pump if you have one. Make sure it's plugged in.
5. Clear around the outdoor unit. Trane suggests clearing away grass, sticks and leaves (Trane).
6. Use the thermostat wisely. UF Extension suggests setting it at 78°F or higher in summer (UF Extension).

Trane suggests keeping drain lines clear with regular maintenance, and recommends having a technician unclog a line that's already blocked (Trane).

What should you do with your AC in storm season?

Before a storm:

• Turn it off. Trane suggests turning off power to your AC or heat pump at both the thermostat and the circuit breaker before you evacuate or hunker down (Trane).
• Ask about a surge protector. Trane says an HVAC surge protector protects the system from storm surges in power, and recommends having a pro install one (Trane).
• Make sure the outdoor unit is secured. Trane recommends hurricane straps for the outdoor unit (Trane).
• In flood-prone spots, ask about raising the unit. Trane suggests elevating the outdoor unit in coastal and hurricane-prone areas, says it helps but isn't a guarantee, and says it isn't a DIY job (Trane).

After a storm:

• If water got into the house or reached the unit, keep it off. Trane says to turn the system off at the breaker if water enters the home, and not to use it until a heating and cooling specialist has inspected it (Trane). Stay away from standing water near electrical equipment.
• Check for damage before you turn it back on. Trane says flooding or flying debris can damage the unit, and turning it on can make things worse (Trane).
• Know what insurance may cover. Trane notes that neither the equipment warranty nor standard homeowners insurance usually covers flood damage to an HVAC system, unless you have flood insurance (Trane).
• If you smell gas or see sparks, leave the house and call 911 or the gas utility from outside.

Recent storms show why this matters. During Hurricane Helene in September 2024, the weather service reported record high water levels at numerous tide gauges along the coast, with the Old Port Tampa gauge reaching 6.83 feet above the normal high-tide mark (NWS Tampa Bay). Two weeks later, Hurricane Milton made landfall as a Category 3 storm and left widespread wind damage, power outages and flash and river flooding well inland. A rain gauge 5.1 miles south of Tampa recorded 16.51 inches (NWS Tampa Bay).

How much do common AC repairs cost?

There's no reliable public source for Tampa-specific repair prices, so these are national ranges as of 2026, from the sources linked on each line:

• Service call or diagnostic fee: $75 to $250 (Fixr).
• Clogged condensate drain line: $75 to $250 (Fixr).
• Condensate pump replacement: $100 to $500 (Fixr).
• Drain pan replacement: $200 to $600 (Fixr).
• Outdoor coil cleaning: $100 to $350 (Fixr).
• Capacitor: $100 to $400 (Fixr).
• Ductwork repair: $200 to $1,000 (Fixr).
• Refrigerant leak repair and recharge: $200 to $1,500 (Fixr).
• After-hours, weekend or holiday surcharge: often $50 to $200 or more (Fixr).

For more on these numbers, see how much AC repair costs.

Repair or replace in Tampa Bay?

ENERGY STAR suggests considering replacement once an AC or heat pump is more than 10 years old, or when it needs frequent repairs and your bills keep rising (ENERGY STAR). Our guide to whether to repair or replace your AC explains the rules of thumb.

Two Tampa-specific points:

• Ask about humidity, not just cooling. UF Extension says a proper load calculation should cover both the heat load and the moisture load, and that the contractor should check the new unit can remove that moisture (UF Extension).
• Don't size up just to be safe. A bigger system can make the clamminess worse.

What rebates and permits apply in Tampa?

Tampa Electric rebates. Tampa Electric offers a rebate for replacing an older system with a new ducted, efficient one: $40 for a system rated at least 15.20 SEER2, and $550 for at least 16.20 SEER2. Ductless mini-splits aren't eligible, and the application is due within 90 days after installation (Tampa Electric).

Tampa Electric duct program. After a pre-approval inspection by a Tampa Electric energy analyst, an approved contractor seals duct leaks for $125 per heating and cooling unit, with extra fees for extensive repairs (Tampa Electric).

Permits in the City of Tampa. The city lists an AC change-out among projects that don't need plan review, and says those permits are available through its Express Permits service (City of Tampa). Ask the company you hire whether it pulls the permit. If you're outside city limits, check with your county.

Checking a license. Florida's Department of Business and Professional Regulation lets you verify licenses by name or license number, and says active licensees must keep minimum insurance at all times (Florida Department of Business and Professional Regulation). It's worth doing before you hire anyone, especially after a storm.

What should you ask the company you call?

• What's causing the water or the humidity, and how did you confirm it?
• Is the drain line clear now, and is there an overflow safety switch?
• Is the drain pan rusted or cracked?
• Is my system the right size for both heat and humidity?
• What's your service-call fee, and does it go toward the repair?
• Is there an after-hours or weekend charge?
• Can I get the price in writing before you start?
• Is your work guaranteed, and for how long?
• If I replace it, will it qualify for Tampa Electric's rebate?

Our guide to reading an HVAC quote explains what each line of a quote should tell you.

The short version

Tampa Bay's heat and humidity keep your AC running and wet for months, so drain lines, drain pans, coils and right-sizing matter more here than in drier places. Check the filter and the drain line first, turn the system off if water is overflowing, and keep it off after a flood until it's inspected. When you're ready to talk to a local company, Check my heating & AC gives you the likely causes, typical costs and the questions to ask.