How this number is built
We start from a 2026 national baseline for HVAC replacement and apply a Montana cost factor of 0.95, which reflects local labour, permitting and material costs. That puts Montana 5% below the national average — ranked #25 of 51 from cheapest to most expensive.
That covers a full replacement — typically a 3–4 ton heat pump or AC-and-furnace pairing — installed and hauled away, before utility rebates. In Montana, where electricity is 12.4¢/kWh, efficiency rating changes running cost more than most people expect.
What moves the price
- System size (tonnage) for your square footage
- Efficiency rating (SEER2)
- Ductwork condition and any modifications
- Heat pump vs traditional AC and furnace
Get a figure modeled for your actual home
This page is a Montana average. Enter your address and we'll model HVAC replacement for your specific property, and render it on the satellite image of your home. Free, no account.
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Other Montana costs
Modeled estimate, not a quote. Figures come from 2026 national baselines adjusted for Montana; your installer sets the real price after seeing the property.