Furnace Replacement Cost in Montana

Across Montana, homeowners pay $3,900 to $9,600 for furnace replacement. Climate, labor rates and housing age all move the price. In Montana's cities, the median home dates to about 1978.

Furnace Replacement Prices in Montana Cities

City	Estimate	Heating / cooling degree days
Billings	$3,800 to $9,200	6,753 / 662
Missoula	$4,000 to $9,700	7,182 / 340
Great Falls	$3,600 to $8,700	6,942 / 421
Bozeman	$4,600 to $11,200	7,827 / 229
Butte	$3,500 to $8,600	9,128 / 82

From 2020 through 2025, NOAA recorded 1,442 winter storm and ice events, 13 heat events, 471 extreme cold events and 905 hail reports in Montana. Those are the days when emergency HVAC calls pile up.

When Replacement Makes Sense

The furnace is 15 to 20 years old or more
A repair quote runs past a third of the cost of a new unit
Gas or electric bills keep climbing even though usage hasn't changed
Some rooms stay cold, the burner short-cycles, or the ignitor keeps failing
A tech found a cracked heat exchanger, or the CO detector has gone off

What Moves the Price

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

Common Questions

How long does a furnace replacement take?

A straight swap is usually done in one day, somewhere between 4 and 10 hours. Moving to a condensing furnace with new PVC venting can add a few more.

Is a high-efficiency furnace worth it?

In cold climates, a 95%+ AFUE furnace usually earns back the price difference in lower gas bills. Where winters are mild, the payback can take a very long time.

Other HVAC Prices in Montana

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