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Quick answer: Check your filter every month and clean or replace it when it’s dirty, keep the outdoor unit clear of leaves, snow, and plants, and book a professional check-up at least once a year (ideally before the heating season). A heat pump runs in both summer and winter, so it works more hours than an AC or furnace, and small problems like a dirty filter or coil cost you money every day they’re left alone.
Heat pumps don’t need much care, but they do need some. EnergySage, citing the U.S. Department of Energy, says a well-maintained heat pump uses 10 to 25 percent less energy than a neglected one (EnergySage). Most of that comes from a few simple habits. Here’s what to do, how often, and what to leave to a technician.
The checklist at a glance
| How often | Task | Who |
|---|---|---|
| Monthly | Check the air filter; clean or replace it if dirty | You |
| Monthly | Look at the outdoor unit: clear leaves, debris, snow, and ice | You |
| Every season | Clean the washable filters in mini-split indoor heads | You |
| Every season | Check that vents and returns are open and unblocked | You |
| Spring and fall | Test heating and cooling before you need them | You |
| Once a year (or twice) | Professional check-up: electrical, refrigerant, coils, drain, controls | Technician |
Monthly: the filter
ENERGY STAR recommends inspecting your filter once a month and cleaning or changing it as needed. A dirty filter restricts airflow, which makes the system work harder, raises energy costs, and can damage equipment and lead to early failure.
- Ducted systems usually have one filter at the air handler or in a return grille. Replace disposable filters with the same size; the dimensions are printed on the frame.
- Mini-split indoor heads have washable mesh filters behind the front panel. Turn the unit off, slide them out, rinse with water, let them dry fully, and put them back.
- If you have pets, allergies, or construction dust, expect to change or clean filters more often.
Monthly: the outdoor unit
- Clear the area. Remove leaves, grass clippings, and trash, and trim plants and shrubs back. Your installation manual lists the exact clearance your model needs.
- In winter, check after storms. Brush off snow and keep the top and sides clear. Don’t chip ice off the coil with tools; you can bend the fins or puncture a line.
- Make sure it’s level and draining. A heat pump drains water during defrost cycles in winter, so meltwater needs somewhere to go.
- Rinse the coil gently from the inside out with a garden hose (power off at the disconnect first) if it’s visibly dirty. Never use a pressure washer.
Seeing frost or a puff of steam in cold weather is normal: the unit is running a defrost cycle. Thick ice that stays on the coil for hours is not normal; see the warning signs below.
Each season: inside the house
- Open and clear vents and returns. Furniture or rugs over vents restrict airflow. Closing many vents to “save energy” usually backfires on a ducted system.
- Test the system before you need it. Run cooling for a few minutes in spring and heating in fall, and listen for unusual noises.
- Check the condensate drain line in cooling season. Water around the indoor unit can mean a clogged drain.
- Review thermostat settings. Set a schedule that fits your routine, and make sure backup heat isn’t set to turn on more than necessary.
Yearly: what a technician should check
ENERGY STAR recommends annual pre-season check-ups, noting that contractors get busy once summer and winter come. A heat pump does both jobs, so a fall visit (before heating season) is a good default; some owners book both spring and fall. A thorough visit should include:
- Checking thermostat settings and system controls for safe, proper operation.
- Tightening electrical connections and measuring voltage and current on motors. Faulty connections can be unsafe and shorten the life of major parts.
- Lubricating moving parts where needed, since friction increases electricity use.
- Checking the condensate drain, since a plugged drain can cause water damage and humidity problems.
- Checking the start-up, operation, and shut-off cycle.
- Cleaning the indoor and outdoor coils. Dirty coils make the system run longer, raising costs and shortening its life.
- Checking the refrigerant charge. Too much or too little makes the system less efficient.
- Cleaning and adjusting blower components. ENERGY STAR says airflow problems can reduce efficiency by up to 15 percent.
Checklist items based on ENERGY STAR’s maintenance checklist.
Ask the technician to also check that the defrost cycle and backup heat work properly, and to tell you the system’s age and condition so you can plan ahead.
Warning signs that need a pro
| What you notice | What it can mean |
|---|---|
| Outdoor coil covered in thick ice that doesn’t clear after defrost | Defrost problem, low airflow, or low refrigerant |
| Air from vents feels cool in heating mode for long periods | System running on low refrigerant, a faulty reversing valve, or backup heat failure |
| Bills jump with no change in weather or habits | Backup heat running too much, a dirty coil, or a refrigerant problem |
| Short cycling (turning on and off every few minutes) | Oversized system, thermostat problem, or a control fault |
| Grinding, squealing, or rattling | Failing fan motor, bearing, or a loose part |
| Water pooling near the indoor unit | Clogged condensate drain |
Don’t add refrigerant yourself or open sealed parts of the system; refrigerant work requires a certified technician.
How long does a heat pump last?
EnergySage says heat pumps typically last around 10 to 15 years, and some experts say well-maintained units can last considerably longer. If yours is near that age and needs an expensive repair, compare the repair with replacement. Our heat pump cost guide and rebates by state can help you price it out.
Frequently asked questions
How often should a heat pump be serviced?
At least once a year by a professional, ideally before the heating season. Because a heat pump runs year-round, some owners book a check-up in both spring and fall.
How often should I change my heat pump filter?
ENERGY STAR recommends checking it every month and cleaning or changing it when it is dirty. Homes with pets or allergies usually need more frequent changes.
Is it normal for a heat pump to ice up in winter?
Light frost is normal, and the unit clears it with defrost cycles. Thick ice that stays on the coil for hours is not normal and needs a technician.
Can I clean my heat pump myself?
You can change filters, clean mini-split filters, clear debris around the outdoor unit, and gently rinse the outdoor coil with the power off. Leave electrical and refrigerant work to a certified technician.
Does maintenance really save money?
Yes. EnergySage, citing the Department of Energy, says a well-maintained heat pump uses 10 to 25 percent less energy than a neglected one.
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Always follow your manufacturer’s manual first; it has model-specific instructions and warranty requirements. If something here looks out of date, let us know.