Heat Pump Maintenance Checklist for Houston's Year-Round Cooling Season

Published October 16, 2026 · Reviewed October 16, 2026

Part of our Heat Pump Maintenance & Tune-Up guides.

What does heat pump maintenance cover?

Heat pump maintenance covers everything an AC tune-up covers plus the parts that let the system run in reverse for heat: the reversing valve, the defrost controls and the backup heat strips. A heat pump is an air conditioner that can also move heat into the house in winter, so it has one more mode to test and a few more parts that can fail quietly.

A heat pump that is only checked in cooling mode has only been half inspected.

Why do Houston heat pumps need a different maintenance schedule?

Houston heat pumps need a different schedule because they run hard in cooling for most of the year and then switch to heating for short, sharp cold spells. NOAA's 1991–2020 normals for Houston Intercontinental Airport (IAH) show roughly 3,288 cooling degree days against 1,266 heating degree days a year, so cooling demand is about 2.6 times heating demand, with about 111 days a year at or above 90°F.

That pattern has two consequences. First, the outdoor coil, fan and compressor rack up long cooling run times, so coil cleaning and electrical checks matter as much as on any Houston AC. Second, the heating side may sit unused for months, so problems with the reversing valve, defrost board or heat strips often show up on the first cold night. ENERGY STAR recommends checking the cooling system in the spring and the heating system in the fall. For a heat pump, that means two visits a year to the same piece of equipment.

What can a homeowner check on a heat pump?

A homeowner can safely check the filter, the outdoor unit's surroundings, the thermostat settings and the condensate drain. Use this list monthly during peak cooling and before the first cold front.

1. Filter: ENERGY STAR recommends inspecting, cleaning or changing filters once a month. A loaded filter cuts airflow in both modes.
2. Outdoor unit clearance: keep plants, fences, trash cans and stored items away from the coil, and rinse off grass clippings after mowing. The unit needs open air on all sides to exchange heat.
3. After storms: look for branches, leaves or debris on top of or against the unit, and check that it is still level on its pad.
4. Condensate drain: in cooling mode the indoor coil produces condensate. Check the pan and drain outlet for standing water.
5. Thermostat: confirm the thermostat is set up for a heat pump and that the mode (cool, heat, auto) is what you expect. If the display is blank, see our blog on how to tell if your thermostat has power.
6. Emergency heat: know what the "EM heat" or "emergency heat" setting does. It runs the electric heat strips alone and bypasses the heat pump. Use it only when the heat pump itself is not working, and call for service.

Leave the electrical panel inside the unit, the refrigerant lines and the heat strips to a licensed technician.

What should a technician check on a heat pump?

A technician should test the heat pump in both cooling and heating mode and record measurements in each. A complete heat pump visit includes:

• Coils: clean the outdoor coil and inspect the indoor (evaporator) coil, cleaning it where accessible.
• Refrigerant charge: check the charge by measurement and look for leak signs. Under EPA Section 608, technicians who service equipment that could release certain refrigerants must be certified.
• Electrical: tighten connections, measure voltage and current on motors, test the capacitor against its rating and inspect the contactor.
• Reversing valve: switch the system between cooling and heating and confirm it changes over cleanly.
• Defrost controls: check the defrost board and sensor so the outdoor coil clears ice in cold, damp weather.
• Auxiliary heat strips: confirm the strips energize when called for and do not run when they shouldn't.
• Airflow and blower: clean and adjust blower components so airflow is right for both modes.
• Drain and controls: clear the condensate drain, test any float switch, and check that controls operate properly and safely.

What are the warning signs a heat pump needs attention?

The clearest warning sign is a heat pump that behaves differently from one mode to the other, such as cooling well in summer but blowing cool air in winter. Watch for these:

• Cool air in heat mode: often a defrost cycle in progress, but if it persists it can point to a reversing valve, refrigerant or control problem. Our guide to a heat pump blowing cold air in heat mode walks through the causes.
• Ice that does not clear: light frost on the outdoor coil in winter is normal, and so is a short burst of steam during defrost. A coil encased in ice that never clears is not.
• Heat strips running constantly: if the "aux heat" indicator stays on in mild weather, the heat pump may not be carrying its share and electric bills climb fast.
• Short cycling or loud changeover noises: frequent on-off cycles, or a loud bang when switching modes, should be checked.
• Water near the indoor unit: a sign of a blocked condensate drain in cooling season.

How can you verify your heat pump is in good shape?

You can verify a heat pump's condition by keeping each visit's written readings and by knowing what your nameplate says. Ask the technician to record, for both modes, the motor amperage, capacitor readings, refrigerant readings and supply and return temperatures, and to note whether the reversing valve, defrost cycle and heat strips were tested.

Your outdoor unit's nameplate also tells you two things worth knowing. The refrigerant type (R-410A on most systems installed before 2025, R-32 or R-454B on many newer ones) affects future repair options. The efficiency rating gives you a reference point: since 2023, the U.S. Department of Energy minimum for new split-system heat pumps is 14.3 SEER2 for cooling and 7.5 HSPF2 for heating. An older unit rated under the older SEER and HSPF scales isn't broken because of that, but the numbers matter if you are weighing replacement.

What should you do next?

Book a spring visit focused on cooling and a fall visit focused on heating, keep the readings from both, and handle the monthly filter and clearance checks yourself. If a visit turns up a failing compressor, a refrigerant leak or a system near the end of its life, that is the point to compare options before an emergency forces the choice. If you also have a separate air conditioner, the AC tune-up guide covers the cooling-only checklist.

Frequently Asked Questions

How often should a heat pump be serviced in Houston?

Twice a year is a sensible schedule for a Houston heat pump: once in spring for cooling and once in fall for heating. ENERGY STAR recommends checking cooling in the spring and heating in the fall, and a heat pump does both jobs with the same outdoor unit.

Is it normal for my heat pump to steam or blow cool air in winter?

A short burst of steam from the outdoor unit and a few minutes of cooler air indoors are normal during a defrost cycle. If cool air continues well beyond that, or the outdoor coil stays encased in ice, the defrost controls, reversing valve or refrigerant charge may need a technician.

What is the difference between auxiliary heat and emergency heat?

Auxiliary heat is the electric heat strip that the system adds automatically when the heat pump needs help. Emergency heat is a thermostat setting that runs the heat strips alone and turns the heat pump off. Emergency heat is meant for when the heat pump has failed, and it costs more to run.

Can I clean my heat pump's outdoor coil myself?

You can keep the area around the outdoor unit clear and rinse off loose grass and leaves from the outside. Opening the cabinet, cleaning inside it, or working near the electrical panel should be left to a licensed technician, because the unit contains high-voltage parts and stored electrical energy.

What efficiency rating should a new heat pump have in Texas?

Since 2023, the U.S. Department of Energy minimum for new split-system heat pumps is 14.3 SEER2 for cooling and 7.5 HSPF2 for heating. Higher-rated models use less energy; whether the extra cost pays back depends on your home and usage.

Does a heat pump need different maintenance than an air conditioner?

A heat pump needs everything an air conditioner needs plus heating-mode checks of the reversing valve, defrost controls and heat strips. Because those parts may sit idle through Houston's long cooling season, testing them in the fall catches problems before the first cold night.

Sources

1. ENERGY STAR — Maintenance Checklist — spring cooling and fall heating check-ups, contractor tasks, monthly filter checks (as of October 16, 2026)
2. NOAA NCEI — U.S. Climate Normals 1991–2020, Houston Intercontinental (USW00012960) — cooling and heating degree days, days at or above 90°F (as of October 16, 2026)
3. U.S. EPA — Section 608 Technician Certification — certification requirement for refrigerant service (as of October 16, 2026)
4. U.S. DOE — 2023 Central Air Conditioner and Heat Pump Standards FAQ (October 5, 2022) — SEER2/HSPF2 metrics and regional minimums (as of October 16, 2026)
5. eCFR — 10 CFR 430.32, energy conservation standards — split heat pump minimum of 14.3 SEER2 / 7.5 HSPF2 (as of October 16, 2026)