HVAC System Replacement Cost in Biloxi, Mississippi
Expect to pay $8,500 to $18,500 for full HVAC system replacement in Biloxi, MS. Most homeowners end up near $14,000, depending on the equipment tier and how much of the old setup can be reused.
Biloxi Weather and HVAC Load
Biloxi logs 1,457 heating degree days and 2,754 cooling degree days in a normal year, based on the closest NOAA weather station. Cooling carries most of the load, which is why compressors and condenser fan motors wear out faster here than in northern cities. A normal year brings 11 nights at or below freezing and 52 days over 90°F.
| Heating degree days / year | 1,457 |
|---|---|
| Cooling degree days / year | 2,754 |
| Nights at or below 32°F | 11 |
| Days above 90°F | 52 |
| Average low / high | 60.6°F / 76.3°F |
Biloxi Housing Stock
The median Biloxi home dates to 1990, according to the Census ACS. That makes the typical house about 36 years old. Plenty of houses from this period still run original 1990s or early-2000s equipment, which is past its expected service life. Biloxi has roughly 9,600 owner-occupied homes, or 48.6% of households. Homes here have a median value of $203,200 and households a median income of $55,958. Those two numbers drive the labor adjustment in our estimate.
Between 2020 and 2025, NOAA's Storm Events Database logged 10 hail days and 21 days with damaging thunderstorm winds in Harrison County. The largest hail reported was 2 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. Harrison County also had 9 tornado days in that period.
When Replacement Makes Sense
- Both units keep needing repairs
- Both the heating and cooling equipment are 15 years old or more
- An old R-22 AC paired with an aging furnace
What Moves the Price
- Duct repair or replacement
- Furnace plus AC, or heat pump plus air handler
- Thermostat and zoning upgrades
- Equipment sized to the house and climate
- Permits and electrical work
- Efficiency ratings: SEER2, AFUE and HSPF2
For Biloxi we kept the national figures close to unchanged, 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
- Duct connections and sealing
- Startup, testing and warranty registration
- New, matched heating and cooling equipment
- Removing the old equipment
- A load calculation and system design
Mississippi Permits, Efficiency Rules and Rebates
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). Plan on a mechanical permit for most replacements in Biloxi; the contractor normally pulls it. Before you sign, ask each bidder for their Mississippi license or registration number and proof of insurance. The federal 25C tax credit ended for equipment installed after December 31, 2025, so incentives now come mostly from utilities and state programs. Check your electric and gas utility's rebate page before you pick equipment.
Before You Hire
- Make every bidder quote the same efficiency ratings, or the prices won't compare.
- Replacing both pieces at once usually costs less than two separate jobs a few years apart.
- Get one quote for a heat pump system and one for a furnace plus AC.
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HVAC System Replacement Questions from Biloxi Homeowners
How much is full HVAC system replacement in Biloxi?
Plan on $8,500 to $18,500, with most jobs near $14,000. Equipment efficiency, house size and the condition of the ducts and wiring decide where your quote falls.
When is the best time to schedule full HVAC system replacement in Biloxi?
Between late fall and early spring. With 52 days over 90°F, Biloxi contractors are booked solid all summer, and off-season jobs are easier to schedule and negotiate.
Can I replace only the AC and keep my furnace?
Yes, as long as the indoor coil and blower work with the new AC. A mismatched system loses efficiency and can void the warranty.
How often should an HVAC system be replaced?
Most systems get replaced every 15 to 20 years. AC units and heat pumps usually wear out before gas furnaces do.
HVAC System Replacement Near Biloxi
- Gulfport $8,000 to $17,500
- Hattiesburg $7,800 to $17,000
- Southaven $8,800 to $19,200
- Jackson $7,900 to $17,100
Sources: U.S. Census Bureau ACS 5-year estimates 2019-2023 and 2024 population estimates; NOAA NCEI U.S. Climate Normals 1991-2020, station Biloxi; NOAA Storm Events Database 2020-2025, Harrison County. Prices are our estimates, not contractor quotes. Updated 2026.