How often should you service a heat pump?
Updated July 2026
Service a heat pump twice a year, once before the heating season and once before cooling, because a heat pump is the rare system that works in all twelve months. A furnace-and-AC pairing splits the year between two machines that each rest half of it; a heat pump does both jobs with one set of parts, so it piles up wear at roughly double the rate and genuinely earns that second annual check.
What changes the interval
| Your situation | Interval | Why |
|---|---|---|
| Standard air-source heat pump | Twice a year | It both heats and cools, so each season needs its own check |
| Mild climate, cooling-dominant | At least yearly, ideally twice | Even light heating use fouls the reversing valve and defrost |
| Cold-climate or dual-fuel system | Twice a year, no skipping | Hard winter runtime stresses defrost and the compressor |
| Coastal salt exposure | Twice a year plus coil rinses | Salt eats the outdoor coil the unit leans on all year |
| Unit past 10 years | Twice a year, watch efficiency | Small issues compound fast near the end of a 12-15 year life |
| Skipped service two or more years | Book a full tune-up now | Deferred faults surface as icing and sky-high winter bills |
The cost of skipping it
What skipping it costs: deferred service lets reversing-valve, defrost-control, and slow-leak refrigerant problems quietly compound, dragging efficiency down and pushing the unit toward an early exit on its 12-15 year life. You feel it as a heat pump that ices over, blows lukewarm air, or leans on the pricey backup electric strips far too often. A tune-up runs $100-250; a compressor or reversing-valve failure runs into the thousands. Twice a year is the difference between the two outcomes.
How to do it (Pro tune-up $100-250 · plus DIY coil rinses)
- Book a pro visit in early fall and early spring to check the refrigerant charge, reversing valve, and defrost cycle.
- Between visits, rinse the outdoor coil and clear leaves, grass, and snow so the unit can breathe in both seasons.
- Change or clean the indoor filter on schedule, since low airflow hurts a heat pump in heating and cooling alike.
- Keep a 2-foot clearance around the unit and make sure it sits on a stand above expected snow depth.
- Listen for grinding, hissing, or near-constant defrost cycles, and flag them at the next service call.
Knowing the interval is the easy half. OnOtto reminds you at the right interval, and it won't let you snooze it into next year. Tasks persist until they're done, and completing heat pump tune-ups schedules the next one automatically.
Put this on autopilot, free for 30 daysFrequently asked questions
Why does a heat pump need service twice when a furnace only needs once?
A furnace works only in winter and rests all summer, so one fall tune-up covers it. A heat pump reverses itself to cool in summer and heat in winter, meaning the same compressor, coils, and reversing valve run essentially year-round. Twice the duty means twice the wear, so a spring check readies it for cooling and a fall check readies it for heating, catching season-specific problems before each load arrives.
Is it normal for my heat pump to steam or ice up in winter?
A little is normal. In cold, damp weather the outdoor coil frosts, and the unit periodically runs a defrost cycle that can produce visible steam as the ice melts off. That should last only a few minutes. What is not normal is thick ice that encases the coil or fan and does not clear, which points to a stuck defrost control, low refrigerant, or blocked airflow and warrants a service call.
Can I do heat pump maintenance myself?
You can handle the airflow half: change filters, rinse the outdoor coil, and keep the unit clear of leaves and snow. That is the same condenser coil care a central AC needs. Leave the rest to a pro, because refrigerant charge, the reversing valve, and electrical checks require certification and tools you likely do not have. The split is simple: DIY the cleaning, hire out the diagnostics.
How much does neglect actually shorten a heat pump's life?
Enough to matter. A neglected heat pump limps along at reduced efficiency while small faults grind on the compressor, and it can fail years before the 12-15 year design life instead of reaching or beating it. The compressor is the part that dies, and it is the most expensive one, so the twice-yearly tune-up is cheap insurance against a four-figure failure in the middle of a cold snap.