Furnace Replacement Cost in Biloxi, Mississippi

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. Heating equipment gets light use, so a furnace here often outlasts the AC it's paired with. A normal year brings 11 nights at or below freezing and 52 days over 90°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

• A tech found a cracked heat exchanger, or the CO detector has gone off
• The furnace is 15 to 20 years old or more
• Some rooms stay cold, the burner short-cycles, or the ignitor keeps failing
• A repair quote runs past a third of the cost of a new unit

What Moves the Price

• New PVC venting if you move to a condensing model
• AFUE rating: a basic 80% unit vs. a 96% condensing furnace
• Permit and inspection fees, which the local building department sets
• Single-stage, two-stage or modulating gas valve
• Condition of the existing ductwork and any changes it needs
• BTU size, which should come from a Manual J load calculation

For Biloxi we lowered the national figures about 18%, 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

• Combustion and safety tests
• The permit and the manufacturer warranty registration
• Gas line and vent connections
• The new furnace, filter rack and thermostat wiring
• Removing and hauling away the old furnace

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

• Replace it in early fall if you can. A no-heat emergency in January costs more and leaves you fewer choices.
• Ask for the Manual J load calculation in writing. Oversized furnaces are the most common mistake we see.
• Look up utility rebates on 95%+ AFUE units before you buy.

Furnace Replacement Questions from Biloxi Homeowners

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Furnace Replacement Near Biloxi

• Gulfport $2,500 to $6,100
• Hattiesburg $2,500 to $6,200
• Southaven $3,100 to $7,500
• Jackson $2,600 to $6,300