Heat Pump Repair in Knoxville, Tennessee
A heat pump repair visit in Knoxville, TN usually costs $160 to $780. 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.
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Knoxville Weather and HVAC Load
NOAA's 1991-2020 climate normals put Knoxville at 3,911 heating degree days and 1,363 cooling degree days per year. Heating is the bigger job here, and furnaces and heat pumps in Knoxville put in far more hours than the air conditioner. Count on roughly 87 nights below 32°F and 36 afternoons past 90°F in a typical year. Snowfall averages about 5 inches.
| Heating degree days / year | 3,911 |
|---|---|
| Cooling degree days / year | 1,363 |
| Nights at or below 32°F | 87 |
| Days above 90°F | 36 |
| Average low / high | 45.9°F / 70°F |
Knoxville Housing Stock
Census figures put the median build year in Knoxville at 1974, so a typical house here has about 52 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. Knoxville has roughly 40,000 owner-occupied homes, or 46.6% of households. The median home value is $214,000, and median household income is $50,994. We use both figures to adjust labor and pricing for this page.
Knox County had 12 hail days and 54 days with damaging thunderstorm winds from 2020 through 2025, according to NOAA storm records. The largest hail reported was 1.75 inches across. Hail flattens the thin aluminum fins on condenser coils and cuts airflow. After a big storm, take a look at the outdoor unit; homeowners insurance often covers the damage.
Symptoms Worth a Service Call
- Grinding or loud buzzing from the outdoor unit
- The system is stuck in heating or cooling
- Ice builds up on the unit and doesn't melt off
- The backup heat runs nonstop
What Moves the Price
- Which part needs replacing: a reversing valve, defrost board or sensor
- Emergency or after-hours service
- Whether the parts warranty still covers it
- Finding and fixing a refrigerant leak, then recharging
- The diagnostic fee
We lowered the national figures about 8% for Knoxville 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
- Checking refrigerant pressures
- Diagnosis in both heating and cooling mode
- A defrost cycle test
- A full test run
- Replacing the failed parts
Tennessee Licensing and Efficiency Rules
Tennessee is in the DOE's Southeast region, where new split central air conditioners need at least 14.3 SEER2 (13.8 SEER2 for systems of 45,000 BTU/h and up). A repair usually goes ahead without a permit, but the tech handling refrigerant must hold EPA 608 certification. Ask the company for its Tennessee license or registration number before the visit.
Before You Hire
- Many heat pumps carry a 10-year parts warranty if they were registered. Find out whether yours was.
- Keep two feet clear around the outdoor unit, including snow.
- Book maintenance twice a year, once before summer and once before winter.
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Heat Pump Repair Questions from Knoxville Homeowners
What does heat pump repair cost in Knoxville?
Most bills land between $160 and $780, including the service call. A typical visit is about $500. Night and weekend calls cost more.
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.
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.
Heat Pump Repair Near Knoxville
- Memphis $160 to $780
- Chattanooga $170 to $830
- Nashville $190 to $910
- Clarksville $170 to $830
Sources: U.S. Census Bureau ACS 5-year estimates 2019-2023 and 2024 population estimates; NOAA NCEI U.S. Climate Normals 1991-2020, station Knoxville Experiment Station; NOAA Storm Events Database 2020-2025, Knox County. Prices are our estimates, not contractor quotes. Updated 2026.