Boiler Replacement Cost in Hattiesburg, Mississippi

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. For a 2,000 sq ft house, this climate points to a heating load somewhere near 35,000 BTU/h. Treat that as a starting number. A Manual J calculation will move it up or down based on insulation and windows.

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.

When Replacement Makes Sense

• Leaks, rust, or pressure that keeps dropping
• The pilot or ignition keeps failing
• Some radiators stay cold
• The boiler is 20 to 30 years old or more

What Moves the Price

• Pumps, zone valves and the piping around the boiler
• Condensing or non-condensing boiler
• A new chimney liner or venting
• A combi boiler that also makes your hot water
• Fuel type: gas, oil or propane

For Hattiesburg we lowered the national figures about 21%, 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

• The new boiler and the piping around it
• Flushing and refilling the system
• Venting and fuel hookups
• Startup and safety tests
• Removing the old boiler

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). Equipment replacements in Hattiesburg generally need a mechanical permit, and a reputable contractor will pull it for you. Ask for their Mississippi license or registration number and a certificate of insurance with the quote. 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

• Ask for a heat-loss calculation. A lot of old boilers are much bigger than the house needs.
• For a steam system, hire a contractor who works on steam regularly.
• Ask your gas or oil company about rebates on condensing boilers.

Boiler Replacement Questions from Hattiesburg Homeowners

More HVAC Prices in Hattiesburg

• Furnace Replacement in Hattiesburg
• Furnace Repair in Hattiesburg
• AC Installation in Hattiesburg
• AC Repair in Hattiesburg
• Heat Pump Installation in Hattiesburg
• Heat Pump Repair in Hattiesburg
• HVAC System Replacement in Hattiesburg
• Ductless Mini-Split Installation in Hattiesburg
• Emergency HVAC Repair in Hattiesburg
• HVAC Tune-Up & Maintenance in Hattiesburg
• Air Duct Cleaning in Hattiesburg

Boiler Replacement Near Hattiesburg

• Gulfport $4,300 to $9,700
• Southaven $5,300 to $11,900
• Biloxi $4,500 to $10,200
• Jackson $4,400 to $10,000