Heat Pump Repair in Gulfport, FL

One machine that cools all summer and heats a few mornings

A heat pump moves heat rather than making it. ENERGY STAR describes it as pulling heat out of your home in summer and bringing heat in from outside in winter. It also suggests thinking of a ducted heat pump as a central air conditioner that also works in reverse.

The part that does the reversing is called a reversing valve. It switches the direction the refrigerant flows. Refrigerant is the sealed fluid that carries heat between the indoor and outdoor coils.

NOAA's normals for the St. Petersburg airport station give an August average high of 89.8°F and a January average low of 55.3°F. Nights below freezing average 0.1 a year at that station.

ENERGY STAR advises having the cooling system checked in the spring and the heating system in the fall, because contractors get busy once summer and winter arrive.

Cool air in heat mode: normal defrost or a real fault?

If your heat pump blows cool air when it is set to heat, start with what is normal. Carrier, a heat pump maker, says this is often the system entering defrost mode to melt ice on the outdoor unit, which is a normal function.

Lennox, another maker, explains that frost can form on the outdoor coil when temperatures hover around freezing and humidity is high. The defrost cycle melts it by reversing operation for a few minutes. Lennox says the whole process usually lasts between 5 and 15 minutes.

During a normal defrost you may see:

• Steam rising from the outdoor unit, which Lennox says is water vapor.
• A whooshing sound as the system shifts modes.
• Cooler air from the vents for a short while.

It stops being normal when it does not stop. Carrier says that cold air blowing constantly, or an outdoor unit that stays frozen, may point to a refrigerant leak or a faulty reversing valve that needs professional repair. Lennox adds that frequent or prolonged defrost cycles may signal an issue that needs professional maintenance.

Our guide to the heat pump defrost mode explains the cycle in more detail.

AUX and EM heat on a Gulfport thermostat

Many heat pump thermostats show AUX or EM. They mean different things, and Carrier says frequent use of auxiliary heat can increase your electric bill.

Auxiliary heat, labeled AUX, is a backup heat source built into the system. Carrier says it typically uses electric resistance heating strips inside the air handler. Carrier says it assists during the defrost cycle to prevent cold air from blowing out of your vents while the outdoor unit de-ices itself.

Emergency heat, labeled EM, is a manual setting. Carrier says it shuts the heat pump off entirely and runs only the backup heat. Carrier advises switching to it only if the heat pump has broken down or malfunctioned.

Watch for one warning sign in particular. Carrier says dirty filters or low refrigerant can force a system onto backup heat even in mild weather. If AUX shows on a mild Gulfport evening, that is worth a service call. See our guides to auxiliary heat and emergency heat.

Safe checks before you call

Carrier lists an incorrect thermostat setting, a tripped circuit breaker and a dirty air filter as the most common reasons a heat pump is not heating. The checks below need no tools and no opened panels.

1. Thermostat. For heat, make sure it says Heat, not Cool or a constant fan setting. For cooling, Carrier says to set it to Cool or Auto, below the room temperature.
2. Filter. ENERGY STAR says to inspect, clean or change filters once a month, and warns that a dirty filter can damage your equipment.
3. If a breaker for the system has tripped, leave it off and call a licensed contractor.
4. Outdoor unit. With the system off, clear leaves, palm fronds and storm debris from around the cabinet by hand.
5. Drain line. In cooling mode, ENERGY STAR says a plugged condensate drain can cause water damage and affect indoor humidity. Water pooling near the indoor unit is a reason to call.

Stop there. Do not open the outdoor unit's electrical panel, do not add refrigerant, and do not chip ice off the coil. If the power went out, the city points residents to Duke Energy, and to 911 for a fallen power line.

Gulfport permits for heat pump work

Permits for work in Gulfport are pulled with the City of Gulfport, through its BS&A portal. The Census Bureau counts 2.765 square miles of land and 1.105 square miles of water inside the city limits.

The city's Community Development Department runs the Building Department from the Public Services Building at the City Hall complex. Its permitting line is (727) 893-1024. Staff can help determine what permits and inspections a project needs.

A new state law did not remove the permit for heat pump work. The city says Florida House Bill 803 created limited permit exemptions from July 1, 2026. It also says those exemptions do not apply to mechanical work, electrical work, or properties located in a flood zone or flood hazard area.

The city's mechanical checklist sets out what a permit application must show:

• Whether the job is an equal change-out or a new installation.
• The make, capacity and efficiency rating of the units.
• The kilowatts of electric heat, where the system has it.
• Load calculations and a duct layout, where they apply.

The city also publishes a recovery permit tally. That tally, updated November 18, 2025, listed 118 HVAC and 271 mechanical permits in its breakdown since October 1, 2024.

Refrigerant, sizing and honest repair-or-replace

Refrigerant work is regulated. EPA rules under Section 608 of the Clean Air Act require technicians who service equipment that could release ozone-depleting refrigerants to be certified. Blume's EPA Section 608 certified technicians handle that work.

ENERGY STAR notes that too much or too little refrigerant makes a system less efficient and shortens the life of the equipment. That is why a charge should be measured, not guessed.

If replacement does come up, size matters. ENERGY STAR says a system that is too large or too small will struggle to keep a home comfortable. It says contractors should verify the right size with Manual J, a calculation of how much heating and cooling a home requires.

Blume sizes equipment by ACCA Manual J load calculation and Manual S selection, not by rule of thumb. Before any work starts, you get a written, upfront price, with repair and replacement set side by side when both make sense. We do not sell equipment a home does not need. For the replace decision itself, see when to replace a heat pump.