FurnaceTallyInput BTU, output BTU, and the gap nobody explains.

How much does a 80% AFUE furnace replacement cost in Hattiesburg, MS?

An 80% AFUE furnace replacement in Hattiesburg, MS
$3,466
reuses the existing metal flue — the cheapest like-for-like swap · typical range $2,736 – $4,743
Typical totalinstalled, 80 afue$3,466
Range you should see in bidsthree bids on the same scope normally land inside this$2,736 – $4,743
Labor portion40% of the job — this is the part that moves by city$1,386
Material portion60% — bought at national prices$2,080
Heating, Air Conditioning, and Refrigeration Mechanics and Installers pay near Hattiesburgabout $24/hr · Hattiesburg, MS metro$50,550/yr
U.S. mean for the same tradeSOC 49-9021$64,780/yr
Versus the national pricetrade pay here runs −22% against the U.S. mean−$334
Design temperatures96°F summer and 25°F winter at Hattiesburg / Mars Hill — the two numbers a Manual J starts from, and the reason equipment sized for one city is wrong in another—

Notes

  • Where the number comes from. The national price for an 80% AFUE furnace replacement is $3,800 installed — gas furnace replacement pricing published for 2026. Labor is about 40% of that. Heating, Air Conditioning, and Refrigeration Mechanics and Installers near Hattiesburg, MS average $50,550 a year against a U.S. mean of $64,780 — a factor of 0.78 — so the labor half is scaled by that and the material half is not. Source: BLS OEWS May 2025 for the Hattiesburg, MS metro area, SOC 49-9021.
  • Why the city matters, not just the state. Trade pay moves inside a state as much as it does between states. Crews do not commute across a state to bid a job, and materials ship at national prices either way — so a metro wage is the honest input here and a state average quietly rounds four different cities into one number.
  • Design temperatures. 96°F summer and 25°F winter at Hattiesburg / Mars Hill — the two numbers a Manual J starts from, and the reason equipment sized for one city is wrong in another.
  • What is in the price: the furnace, removal and disposal of the old one, a new flue or vent kit, gas and electrical connections, a thermostat, permit and labor.
  • What is not: ductwork changes, a chimney liner where an 80% unit is orphaned by a water heater, and any return-air work the new blower needs. These are the lines that turn a $3,466 quote into a $4,333 invoice, so ask about each one before signing.
  • Use this as a bid check, not a quote. It prices an average job in average condition. Difficult access, the state of what is being replaced, the season, and a crew booked out three months all move the real number, and none of them are in a national average for the job.

an 80% AFUE furnace replacement in Hattiesburg, MS

$3,466 is the typical number, and three bids on the same scope normally land between $2,736 and $4,743.

That is $334 less than the same job priced at the national average.

Why the city changes the number

About 40% of this job is labor — $1,386 of the $3,466 above. Labor is the only part that moves locally; a bundle of material costs what it costs wherever it is nailed down.

Heating, Air Conditioning, and Refrigeration Mechanics and Installers near Hattiesburg average $50,550 a year, against a U.S. mean of $64,780. That is a factor of 0.78, so the labor half is scaled by it and the material half is not.

Source: BLS OEWS May 2025 for the Hattiesburg, MS metro area, SOC 49-9021.

What the quote should include

Design temperatures

The lines that turn a quote into an invoice

Ask about each of them before you sign. On a job this size they are the difference between $3,466 and something a quarter higher.

Use it as a bid check, not a quote

This prices an average job in average condition. Access, the state of what is being replaced, the season, and a crew booked out three months all move the real number, and none of them are in a national average.

If a bid lands outside $2,736 – $4,743, that is not automatically wrong — but it is the question worth asking out loud.

Nearby sizes

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