Heat Pump Repair in Riverview, FL

A county community, not a city

Riverview has no city hall and no city building department. The U.S. Census Bureau lists it as a census-designated place. It says these places represent unincorporated communities without an active, functioning governmental structure.

That makes Hillsborough County the local government for heat pump work. The county's Development Services says it provides permitting and building inspection services for all of unincorporated Hillsborough County. Plan Hillsborough, which writes the Riverview Community Plan, draws its own Riverview planning area of approximately 56 square miles.

Plan Hillsborough's March 2025 profile of that area shows how fast homes went up. Residential permits peaked in 2019, with 3,084 issued. It counts 2,948 newly built or rebuilt residential units in 2020 alone. By 2024 the pace had slowed, with 632 residential permits issued.

Two details help a technician before a repair visit:

• Roughly when the house was built, and whether the heat pump has been replaced after that.
• The model and serial number from the data plate on the outdoor unit.

If you are not sure your system is a heat pump, see how to tell if you have a heat pump. Our Riverview HVAC page covers flooding along the Alafia River and outdoor equipment.

A cooling climate with a handful of cold nights

NOAA's nearest climate normals station is the National Weather Service's Tampa Bay Area forecast office station. It sits about 10 miles southwest of the Census Bureau's center point for Riverview. Its 1991-2020 normals give an August average high of 91.0°F and a January average low of 50.7°F.

Cold nights are few but real. The station averages 12 nights a year below 40°F, and 5.5 of them fall in January. It averages 1.6 nights a year below freezing.

Degree days put a number on heating and cooling demand. The National Weather Service counts heating degree days when a day's mean temperature is below 65°F, and cooling degree days when it is above. This station's normals list about 3,477 cooling degree days a year against about 499 heating degree days.

The monthly normals show no heating degree days from June through September.

Cool air on a heat setting: defrost or a fault?

ENERGY STAR says heat pumps move heat rather than converting it from fuel. In summer a heat pump pulls heat out of the home; in winter it brings heat in from outdoors. Carrier, a heat pump maker, says the reversing valve is the part that switches the direction of refrigerant flow. Refrigerant is the fluid sealed inside the system that carries the heat.

Cool air from the vents on a cold morning is not always a fault. Carrier says it can be the unit entering defrost mode to melt ice on the outdoor unit, which is a normal function. Lennox, another maker, says defrost briefly reverses operation, sending heat back to the coil outside.

Signs of a normal defrost, according to Lennox:

• It usually lasts between 5 and 15 minutes, depending on weather and frost levels.
• Steam may rise from the outdoor unit.
• You may hear a whooshing sound as the system shifts modes.

Carrier adds that heat pump air may naturally feel cooler than the heat from a gas furnace.

It is a fault when the ice stays. Carrier says ice thicker than 1/4 inch, or ice that remains after defrost, is not normal. Lennox says a heat pump that enters defrost too often, or runs it unusually long, may have a problem. If cooling works but heating does not, Carrier says the reversing valve may be stuck. Our guide to heat pump defrost mode explains the cycle.

AUX heat, heat strips and your Tampa Electric bill

Tampa Electric says it is the primary power provider in Hillsborough County. It says home heating can have the biggest impact on your electric bill when temperatures drop. For heat pump owners, it says to limit the activation of the supplemental heat strip by making minor, periodic thermostat adjustments.

Carrier describes auxiliary heat as a secondary heating source built into a heat pump system. It uses electric resistance heating strips, similar to the coils in a toaster, inside the air handler.

Tampa Electric says big temperature jumps can switch those strips on, and that they use a lot of electricity. Its cold-weather tips:

• Raise the temperature a few degrees at a time.
• Set the thermostat to 68°F or the lowest comfortable setting, and keep it constant.

AUX in mild weather is a warning sign. Carrier says AUX running above 40°F may point to a dirty air filter. It says dirty filters or low refrigerant can force a system onto backup heat even in mild weather.

Emergency heat, shown as EM, is a different setting. Carrier says it shuts off the heat pump entirely and runs only the backup heat. Carrier says to switch to it only if the heat pump has broken down or malfunctioned. See our guides to auxiliary heat and emergency heat.

Safe checks before you call

Carrier names an incorrect thermostat setting, a tripped circuit breaker or a dirty air filter as the most common reasons a heat pump is not heating. Only some of that is a homeowner job. These checks need no tools and no panels opened:

1. Thermostat settings. For heat, the mode should say Heat, with the set temperature above the room reading. For cooling, it should say Cool, set below the room reading. Our thermostat settings guide explains the modes.
2. Air filter. ENERGY STAR says heat pump filters should be cleaned when visibly dirty or when the filter light says so. Tampa Electric says to inspect filters regularly and replace them monthly. See our air filter guide.
3. Vents, returns and the outdoor unit. Move furniture and rugs off supply vents and return grilles. With the system off at the thermostat, clear leaves and yard debris from around the outdoor unit by hand.

If a breaker for the heat pump has tripped, leave it off and call a licensed contractor.

Stop there. Do not chip ice off the coil, open the outdoor unit's panels or add refrigerant. Carrier says complex issues involving refrigerants or electrical components require a professional.

Permits and inspections in unincorporated Hillsborough County

Plan on a county permit for heat pump replacement work. Hillsborough County exempts some lower-value, non-structural work on a single-family home from permits, but not on property in a flood hazard area. Its page on work exempt from permits says the exemption does not apply when the work includes electrical, plumbing, structural, mechanical or gas work.

The county says homeowners can generally pull their own permit and act as their own contractor. If you hire a contractor, the county says the contractor will obtain all of the necessary permits. It also advises making sure anyone you hire holds a valid contractor license.

For an AC changeout, the county's virtual inspection grid lists a mechanical final and an electrical final. Either can be done live, by real-time video between inspector and contractor, or offline with photos and videos from the jobsite.

EPA lists R-454B and R-32 as acceptable, with use conditions, in residential air conditioners and heat pumps. Its table gives both the ASHRAE safety designation A2L. The county's permit resources include an installer affidavit for a refrigeration pressure test on A2L systems.

Our HVAC permit guide covers the general process in Florida.

Refrigerant, sizing and an honest repair-or-replace call

Refrigerant work is regulated. EPA says Section 608 of the Clean Air Act requires technicians who maintain, service, repair or dispose of equipment that could release ozone-depleting refrigerants into the atmosphere to be certified. Blume's EPA Section 608 certified technicians handle that work. Our Section 608 guide explains the rule.

If replacement comes up, size matters. ENERGY STAR says properly sized equipment is essential to the best performance and comfort. It says your contractor should verify the right size using a tool called Manual J, a calculation of how much heating and cooling a home needs.

Blume sizes equipment by ACCA Manual J load calculation and Manual S equipment selection, not by copying the old unit. New installs are commissioned with measured static pressure, airflow and refrigerant charge. You get a written, upfront price before any work, with repair and replacement side by side. Blume does not sell equipment a home does not need, and financing is available through Synchrony Bank.

Blume offers 24/7 emergency HVAC service, with same-day response available based on location and technician availability. For the decision itself, see when to replace a heat pump. Nearby, we also cover heat pump repair in Brandon.