Heat Pump Repair in Dover, New Hampshire
A heat pump repair visit in Dover, NH usually costs $230 to $1,130. Where you land depends on the part. A capacitor or defrost sensor sits at the low end, while a reversing valve or defrost control board pushes the bill toward the top.
Dover Weather and HVAC Load
In a normal year, Dover racks up 6,919 heating and 410 cooling degree days (NOAA 1991-2020 normals). Heating is the bigger job here, and furnaces and heat pumps in Dover put in far more hours than the air conditioner. On average, Dover gets 150 freezing nights and 6 days above 90°F per year. Snowfall averages about 39 inches.
| Heating degree days / year | 6,919 |
|---|---|
| Cooling degree days / year | 410 |
| Nights at or below 32°F | 150 |
| Days above 90°F | 6 |
| Average low / high | 37°F / 57.1°F |
Dover Housing Stock
Census figures put the median build year in Dover at 1975, so a typical house here has about 51 years on it. A lot of these homes are on their second or third system by now. The ductwork is usually original, and leaky joints are common. Dover has roughly 7,700 owner-occupied homes, or 51.3% of households. With a median household income of $92,748 and a median home value of $398,500, local labor rates come out above the national middle in our model.
NOAA storm reports for Strafford County show 2 hail days and 14 days with damaging thunderstorm winds over the six years from 2020 to 2025. The largest hail reported was 1.75 inches across. Storms here are more likely to cause power surges than coil damage, so a surge protector on the outdoor unit is worth the small cost.
Symptoms Worth a Service Call
- Ice builds up on the unit and doesn't melt off
- Grinding or loud buzzing from the outdoor unit
- The system is stuck in heating or cooling
- The backup heat runs nonstop
What Moves the Price
- Emergency or after-hours service
- Finding and fixing a refrigerant leak, then recharging
- The diagnostic fee
- Which part needs replacing: a reversing valve, defrost board or sensor
- Whether the parts warranty still covers it
We raised the national figures about 33% for Dover using local income, home values and the equipment size this climate needs. Real bids can still come in outside the range, so collect three written quotes.
What the Quote Should Cover
- A full test run
- A defrost cycle test
- Replacing the failed parts
- Diagnosis in both heating and cooling mode
- Checking refrigerant pressures
New Hampshire Licensing and Efficiency Rules
New Hampshire falls in the DOE's North region. New split central air conditioners must meet at least 13.4 SEER2, and heat pumps sold anywhere in the U.S. need 14.3 SEER2 and 7.5 HSPF2. A repair usually goes ahead without a permit, but the tech handling refrigerant must hold EPA 608 certification. Ask the company for its New Hampshire license or registration number before the visit.
Before You Hire
- Keep two feet clear around the outdoor unit, including snow.
- Light frost on the outdoor unit in winter is normal. A solid block of ice is not.
- Many heat pumps carry a 10-year parts warranty if they were registered. Find out whether yours was.
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Heat Pump Repair Questions from Dover Homeowners
What does heat pump repair cost in Dover?
Most bills land between $230 and $1,130, including the service call. A typical visit is about $730. Night and weekend calls cost more.
Is it normal for a heat pump to freeze?
A thin layer of frost in winter is normal, and the defrost cycle should clear it. Heavy ice that stays usually means a defrost control or airflow problem.
Why is my heat pump blowing cold air?
For a few minutes during a defrost cycle, that's normal. If it keeps going, the usual causes are a stuck reversing valve, low refrigerant or a thermostat set to the wrong mode.
Heat Pump Repair Near Dover
- Rochester $210 to $1,010
- Concord $220 to $1,060
- Nashua $230 to $1,100
- Manchester $210 to $1,040
Sources: U.S. Census Bureau ACS 5-year estimates 2019-2023 and 2024 population estimates; NOAA NCEI U.S. Climate Normals 1991-2020, station Durham; NOAA Storm Events Database 2020-2025, Strafford County. Prices are our estimates, not contractor quotes. Updated 2026.