HVAC Replacement Cost in Hattiesburg, MS (2026)
Updated October 2026 · Hattiesburg, MS · index 0.85
How much does a new HVAC system cost in Hattiesburg? For a 3-ton system with central AC + gas furnace, homeowners in Hattiesburg, MS pay about $8,950 on average, and most quotes land between $6,100 and $11,800 — $2,038 to $3,940 per ton. The price covers removing the old system, the new outdoor and indoor equipment, a new line set, electrical and condensate connections, the thermostat, the permit, start-up and commissioning.
The HVAC replacement price in Hattiesburg runs 15% below the U.S. average: construction labor in the Hattiesburg area runs 24% below the national mean, materials 3% below. The same job averages $10,500 nationally and about $9,050 at the Mississippi statewide index.
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HVAC replacement price in Hattiesburg by system type
What a 3-ton system costs in Hattiesburg with each system type, installed:
| Option | Average · range |
|---|---|
| Central AC + gas furnacesplit AC, matched coil and an 80,000 BTU furnace$2,989 per ton | $8,950$6,100 – $11,800 |
| Heat pump + air handlerall-electric split heat pump, no furnace$2,773 per ton | $8,300$5,600 – $11,100 |
| Cold-climate heat pump + air handlervariable-speed heat pump rated for deep winter$3,166 per ton | $9,500$6,400 – $12,600 |
The least expensive option in Hattiesburg is heat pump + air handler, at about $8,300; cold-climate heat pump + air handler averages $9,500, 1.1 times as much.
Cost to replace an HVAC system in Hattiesburg by size
With central AC + gas furnace, priced for Hattiesburg, MS:
| Size | Average · range |
|---|---|
| A 2-ton system$3,893 per ton | $7,800$5,300 – $10,300 |
| A 3-ton system$2,989 per ton | $8,950$6,100 – $11,800 |
| A 4-ton system$2,536 per ton | $10,100$6,900 – $13,400 |
Some costs stay the same whatever the size — load calculation and equipment sizing, mechanical permit and inspection, old system removed, refrigerant recovered — so a bigger job costs less per unit: $2,536 per ton for a 4-ton system against $3,893 for a 2-ton system.
What an HVAC replacement in Hattiesburg includes
Line by line, the $8,950 average for a 3-ton system breaks down like this: 32% labor, 65% materials and equipment, and $280 in permit fees passed through at cost.
| Line | Low – high |
|---|---|
| Load calculation and equipment sizing | $60 – $190 |
| Mechanical permit and inspection | $150 – $400 |
| Old system removed, refrigerant recovered | $290 – $520 |
| Gas furnace (about 80,000 BTU) | $1,300 – $2,350 |
| Outdoor unit, set on a new pad | $1,950 – $3,600 |
| Matched indoor coil | $840 – $1,800 |
| New refrigerant line set (25 ft) | $320 – $520 |
| Disconnect, whip and thermostat wire | $180 – $290 |
| Condensate drain and safety switch | $100 – $230 |
| Gas connection and furnace venting | $270 – $500 |
| Plenums and transitions to the ducts | $230 – $520 |
| Programmable or smart thermostat | $190 – $360 |
| Evacuation and refrigerant charge | $100 – $190 |
| Start-up and commissioning | $100 – $230 |
| Warranty registration and walk-through | $50 – $110 |
Each line is the price book's U.S. rate for that step, scaled by 0.76 to the installed price published sources give for the whole job (see how these prices are built), times Hattiesburg's index of 0.85; permit fees are not scaled.
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What affects HVAC replacement prices in Hattiesburg
Labor and materials in Hattiesburg
Construction wages in the Hattiesburg metro run 26% below the U.S. mean (BLS, May 2025), and specialty-contractor pay in the city's county moves that up by 3%, to 24% below the national mean. Materials in the area's ZIP codes price 3% below the national average. Together they give Hattiesburg a construction cost index of 0.85.
Where Hattiesburg sits in Mississippi
Hattiesburg is the 2nd most expensive of the 3 Mississippi cities in our index, against a statewide index of 0.86. Gulfport is the dearest at 0.88; no Mississippi city in it costs less.
Against the rest of the country
Of the 306 U.S. cities in JobFlex's index, Hattiesburg ranks 299th from the most expensive. The job that averages $8,950 here averages $10,500 at the national rate.
Climate a system is sized for in Mississippi
Contractors size equipment for the local design temperatures. Across Mississippi's counties the median is about 95°F on a hot summer day and 25°F on a cold winter night (ENERGY STAR county table), and your county can differ. A standard heat pump handles most winters here; a furnace or a cold-climate model covers the coldest nights.
Sales tax in Mississippi
Mississippi's base state sales tax is 7%, and cities and counties can add their own. How it applies to a home-improvement contract varies, so ask whether a quote includes it. Prices on this page are before tax.
What a Hattiesburg contractor will ask before quoting
- Job type — new construction, replacement or upgrade — and the evidence for it
- Heating and cooling load for this house (not the old nameplate), tonnage, fuel and refrigerant
- Ducts, line set, circuit, gas line and flue: keep, fix or replace, each with its reason
- Water heater in scope, and whether it shared the old flue
- Panel main amps, free slots and the new equipment's MCA
- Permits, tests and incentives that apply in this state
HVAC replacement cost in other Mississippi cities
A 3-ton system with central AC + gas furnace averages $8,950 in Hattiesburg; $9,250 in Gulfport, $8,950 in Jackson.
| City | Average · range |
|---|---|
| Gulfport, MS4% more | $9,250$6,300 – $12,200 |
| Jackson, MSsame as Hattiesburg | $8,950$6,100 – $11,800 |
HVAC replacement price in Hattiesburg: questions
How much does a new HVAC system cost in Hattiesburg, MS?
About $8,950 for a 3-ton system with central AC + gas furnace, and most Hattiesburg quotes fall between $6,100 and $11,800. That is 15% below the U.S. average, where the same job averages $10,500.
What is the HVAC price per ton in Hattiesburg?
$2,038 to $3,940 per ton, about $2,989 on average with central AC + gas furnace. Smaller jobs cost more per unit, because the fixed costs are spread over less.
How much is a 4-ton system in Hattiesburg?
$6,900 to $13,400, about $10,100 on average, with central AC + gas furnace — $2,536 per ton.
Do you need a permit for HVAC replacement in Hattiesburg?
Yes — installing HVAC or fuel-burning equipment needs a permit nearly everywhere, Hattiesburg included. The prices on this page carry $150–$400 for the permit and inspection.
Does the price include sales tax in Mississippi?
No. The prices here are before tax; Mississippi's base state rate is 7%, plus any local rate.
What size HVAC system does a house in Hattiesburg need?
It is worked out with a Manual J load calculation for the house — included in the prices above — not from square footage alone. Here it is run against design temperatures of about 95°F in summer and 25°F in winter (the Mississippi median).
Other home projects in Hattiesburg
HVAC replacement cost in Mississippi
How these prices are built
Every price on this page comes from JobFlex's contractor price book: what a homeowner pays a licensed contractor for each step of the job, as a U.S. national average per unit, with the contractor's overhead and profit included and sales tax left out. The HVAC replacement is priced step by step, then multiplied by Hattiesburg's construction cost index of 0.85.
Where the price book's steps for an option add up to more than 20% over the installed price a published source gives for the whole job, every step but a permit fee is scaled down to the middle of that range: central AC + gas furnace × 0.76 (HomeCostCalcs 2026: $7,000–$14,000); heat pump + air handler × 0.76, following central AC + gas furnace; cold-climate heat pump + air handler × 0.76, following central AC + gas furnace.
The index weighs local construction wages (BLS Occupational Employment and Wage Statistics, May 2025) at 60% and the area's material prices (Craftsman ZIP-area factors) at 40%. Published indices for Hattiesburg, each on its own base: Craftsman 1.03. Treat any city figure as about ±5%; a contractor's quote for your house is the number to plan with.
Contractors in Hattiesburg build quotes like these with JobFlex's HVAC estimator.
- HomeCostCalcs 2026: furnace + AC replacement $7,000-$14,000 standard, $10,000-$20,000 high efficiency
- Today's Homeowner 2025: complete HVAC system install $5,000-$12,500