HVAC System Replacement Cost in Montana

Across Montana, homeowners pay $10,500 to $22,800 for full HVAC system replacement. Climate, labor rates and housing age all move the price. In Montana's cities, the median home dates to about 1978.

HVAC System Replacement Prices in Montana Cities

City	Estimate	Heating / cooling degree days
Billings	$10,000 to $21,900	6,753 / 662
Missoula	$10,600 to $23,100	7,182 / 340
Great Falls	$9,500 to $20,600	6,942 / 421
Bozeman	$12,200 to $26,500	7,827 / 229
Butte	$9,400 to $20,400	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

Both the heating and cooling equipment are 15 years old or more
Both units keep needing repairs
Some rooms are uncomfortable, and the energy bills are high
An old R-22 AC paired with an aging furnace

What Moves the Price

Furnace plus AC, or heat pump plus air handler
Efficiency ratings: SEER2, AFUE and HSPF2
Equipment sized to the house and climate
Duct repair or replacement
Thermostat and zoning upgrades
Permits and electrical work

Common Questions

How often should an HVAC system be replaced?

Most systems get replaced every 15 to 20 years. AC units and heat pumps usually wear out before gas furnaces do.

Can I replace only the AC and keep my furnace?

Yes, as long as the indoor coil and blower work with the new AC. A mismatched system loses efficiency and can void the warranty.

Other HVAC Prices in Montana

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