Heat Pump Repair in Mount Prospect, Illinois
A heat pump repair visit in Mount Prospect, IL usually costs $230 to $1,110. 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.
Compare Free Quotes in Mount Prospect
Mount Prospect Weather and HVAC Load
In a normal year, Mount Prospect racks up 6,085 heating and 933 cooling degree days (NOAA 1991-2020 normals). Heating is the bigger job here, and furnaces and heat pumps in Mount Prospect put in far more hours than the air conditioner. A normal year brings 122 nights at or below freezing and 17 days over 90°F. Snowfall averages about 38 inches.
| Heating degree days / year | 6,085 |
|---|---|
| Cooling degree days / year | 933 |
| Nights at or below 32°F | 122 |
| Days above 90°F | 17 |
| Average low / high | 42.3°F / 59.2°F |
Mount Prospect Housing Stock
Census figures put the median build year in Mount Prospect at 1969, so a typical house here has about 57 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. Mount Prospect has roughly 15,000 owner-occupied homes, or 70% of households. The median home value is $377,000, and median household income is $103,911. We use both figures to adjust labor and pricing for this page.
NOAA storm reports for Cook County show 27 hail days and 75 days with damaging thunderstorm winds over the six years from 2020 to 2025. The largest hail reported was 2.75 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. Cook County also had 8 tornado days in that period. In Mount Prospect, 18.3% of residents are 65 or older. For older adults, a house with no heat in January or no AC during a heat wave is a medical risk. Mention it when you call, since many companies put those calls first.
Symptoms Worth a Service Call
- The backup heat runs nonstop
- Ice builds up on the unit and doesn't melt off
- Cool air coming out in heating mode
- The system is stuck in heating or cooling
What Moves the Price
- Which part needs replacing: a reversing valve, defrost board or sensor
- Emergency or after-hours service
- The diagnostic fee
- Finding and fixing a refrigerant leak, then recharging
- Whether the parts warranty still covers it
We raised the national figures about 31% for Mount Prospect 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
- Diagnosis in both heating and cooling mode
- Replacing the failed parts
- Checking refrigerant pressures
- A defrost cycle test
Illinois Licensing and Efficiency Rules
Illinois 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 Illinois 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.
- Light frost on the outdoor unit in winter is normal. A solid block of ice is not.
- Keep two feet clear around the outdoor unit, including snow.
Get Free Heat Pump Repair Quotes in Mount Prospect
Tell us where you are and up to three licensed local pros will get in touch. You don't have to hire any of them.
Heat Pump Repair Questions from Mount Prospect Homeowners
What does heat pump repair cost in Mount Prospect?
Most bills land between $230 and $1,110, including the service call. A typical visit is about $710. 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 Mount Prospect
- Des Plaines $220 to $1,050
- Arlington Heights $240 to $1,170
- Oak Lawn $200 to $970
- Berwyn $200 to $960
- Orland Park $220 to $1,080
- Tinley Park $220 to $1,080
- Wheaton $250 to $1,190
- Skokie $220 to $1,090
Sources: U.S. Census Bureau ACS 5-year estimates 2019-2023 and 2024 population estimates; NOAA NCEI U.S. Climate Normals 1991-2020, station Chicago Palwaukee Airport; NOAA Storm Events Database 2020-2025, Cook County. Prices are our estimates, not contractor quotes. Updated 2026.