What does skipping heat pump maintenance cost?
Updated August 2026
← What skipping home maintenance costs
Because a heat pump both heats and cools, skipping its twice-a-year service is doubly expensive: $100–250 a year in maintenance versus a $7,000 comeback bill. Dirty coils and a low refrigerant charge quietly force the system onto its backup electric-strip heat, which alone can add $50–150 a month to a winter power bill. Let it ride and a stuck reversing valve ($600–1,200) or a failed compressor takes an aging unit past the point of repair, meaning a $5,500–9,000 replacement. Heat pumps last 12–15 years when they are cleaned and correctly charged. Here is the escalation, cheapest line to worst.
The escalation ladder
Every row below is the same leak, left a little longer. The top is a cheap warning; the bottom is a claim.
| What happens | Typical bill | How fast |
|---|---|---|
| You keep the twice-a-year service | $100–250 a year total | Spring and fall |
| Dirty coils and low charge trip backup strip heat | $50–150 a month extra in winter | Cold months |
| The defrost control or reversing valve sticks | $600–1,200 to repair | 1–3 years |
| A refrigerant leak overworks the compressor | $200–1,500 to trace and recharge | A season or two |
| The compressor fails on an aging unit | $1,300–2,800 for the part alone | 3–5 years of neglect |
| That totals a 12–15-year heat pump | $5,500–9,000 to replace | End of the line |
Warning signs
A struggling heat pump shows itself in the power bill first. A winter statement that jumps by $50 or more for the same cold snap usually means the unit has fallen back on its electric-strip heat to keep up. Watch also for an outdoor unit buried in snow, leaves, or ice, air from the vents that feels only lukewarm, and a system that never seems to reach temperature on cold days. Frost that stays caked on the outdoor coil long after a defrost cycle, loud grinding or humming, and constant switching between heating and cooling are all cues that a coil, the reversing valve, or the compressor needs attention before it strands you.
The prevention math
Because a heat pump works twelve months a year, it earns two visits, spring and fall, for $100–250 total. A tech cleans both coils, verifies the refrigerant charge, and tests the defrost and reversing valve, the parts whose failure drives every expensive row above. Between visits, keep the outdoor unit clear of snow, leaves, and ice, and rinse the coils yourself. That $100–250 is pocket change next to the $50–150 a month strip heat quietly adds or a $5,500–9,000 replacement. The interval and the coil rinse are in how often to service a heat pump and cleaning heat pump coils.
Every line in that table starts with a skipped 10-minute task. OnOtto keeps the 10-minute version on your calendar so the $2,000 version never happens.
Get the nudge before the billFrequently asked questions
How often does a heat pump need servicing?
Twice a year, once before cooling season and once before heating season, because a heat pump works all twelve months and never gets the off-season a straight AC does. Total professional service runs $100–250 a year, and between visits you should rinse the outdoor coil and keep it clear of snow, leaves, and ice. That cadence is the single biggest factor in whether the unit reaches its 12–15-year life. See how often to service a heat pump.
Why is my heat pump running up such a high winter bill?
Almost always because it has fallen back on its electric-strip backup heat. When the coils are dirty or the refrigerant is low, the heat pump cannot pull enough warmth from outside, so the resistance strips kick in and can add $50–150 a month. A stuck reversing valve or a bad defrost control does the same. If your bill jumps for the same weather, get it serviced before the compressor, a $5,500–9,000 replacement on an aging unit, becomes the next line item.
Is heat pump maintenance different from AC maintenance?
It overlaps but adds a season and a few parts. Everything an AC tune-up covers applies, plus a heat pump has a reversing valve, a defrost control, and an auxiliary heat stage that all need checking, and it needs that done in both spring and fall rather than once a year. The outdoor unit also runs in winter, so keeping it clear of snow and ice matters in a way it never does for an AC. The coil-cleaning interval is in cleaning heat pump coils.