Heat Pump Repair in Hattiesburg, Mississippi
Heat pump repair in Hattiesburg starts near $160 for a simple fix and can reach $780 for after-hours calls or major parts. A typical bill is closer to $500.
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Hattiesburg Weather and HVAC Load
NOAA's 1991-2020 climate normals put Hattiesburg at 1,922 heating degree days and 2,439 cooling degree days per year. Neither season dominates in Hattiesburg. That balance is a big reason heat pumps and dual-fuel systems sell well in Mississippi. A normal year brings 32 nights at or below freezing and 85 days over 90°F.
| Heating degree days / year | 1,922 |
|---|---|
| Cooling degree days / year | 2,439 |
| Nights at or below 32°F | 32 |
| Days above 90°F | 85 |
| Average low / high | 55.4°F / 77.3°F |
Hattiesburg Housing Stock
Half the homes in Hattiesburg were built before 1980 (Census ACS median), so the typical house is about 46 years old. A lot of these homes are on their second or third system by now. The ductwork is usually original, and leaky joints are common. Hattiesburg has roughly 7,400 owner-occupied homes, or 36.5% of households. The median home value is $153,600, and median household income is $44,140. We use both figures to adjust labor and pricing for this page.
Forrest County had 13 hail days and 32 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. Forrest County also had 5 tornado days in that period.
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
- Cool air coming out in heating mode
What Moves the Price
- Whether the parts warranty still covers it
- The diagnostic fee
- Emergency or after-hours service
- Which part needs replacing: a reversing valve, defrost board or sensor
- Finding and fixing a refrigerant leak, then recharging
For Hattiesburg we lowered the national figures about 8%, based on local income, home values and climate-based equipment sizing. Get at least three written quotes; real bids can land outside this range.
What the Quote Should Cover
- A defrost cycle test
- Checking refrigerant pressures
- Replacing the failed parts
- A full test run
- Diagnosis in both heating and cooling mode
Mississippi Licensing and Efficiency Rules
Mississippi 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). Most repairs don't need a permit. Anyone who opens the refrigerant circuit does need EPA Section 608 certification, and in Mississippi the company should carry a state license or registration. Ask for both.
Before You Hire
- Light frost on the outdoor unit in winter is normal. A solid block of ice is not.
- Book maintenance twice a year, once before summer and once before winter.
- 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 Hattiesburg Homeowners
What does heat pump repair cost in Hattiesburg?
Most bills land between $160 and $780, including the service call. A typical visit is about $500. 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 Hattiesburg
Sources: U.S. Census Bureau ACS 5-year estimates 2019-2023 and 2024 population estimates; NOAA NCEI U.S. Climate Normals 1991-2020, station Hattiesburg; NOAA Storm Events Database 2020-2025, Forrest County. Prices are our estimates, not contractor quotes. Updated 2026.