AC Installation Cost in Billings, Montana
Expect to pay $3,800 to $8,700 for new AC installation in Billings, MT. Most homeowners end up near $6,500, depending on the equipment tier and how much of the old setup can be reused.
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Billings Weather and HVAC Load
Billings logs 6,753 heating degree days and 662 cooling degree days in a normal year, based on the closest NOAA weather station. Heating is the bigger job here. The AC still runs every summer, but it works far fewer hours than the furnace does. On average, Billings gets 142 freezing nights and 32 days above 90°F per year. Snowfall averages about 57 inches. On the cooling side, a 2,000 sq ft house here usually needs around 2.5 tons. A tight, well-insulated house may get by with half a ton less.
| Heating degree days / year | 6,753 |
|---|---|
| Cooling degree days / year | 662 |
| Nights at or below 32°F | 142 |
| Days above 90°F | 32 |
| Average low / high | 37°F / 59.4°F |
Billings Housing Stock
Half the homes in Billings were built before 1979 (Census ACS median), so the typical house is about 47 years old. A lot of these homes are on their second or third system by now. The ductwork is usually original, and leaky joints are common. Owners live in 64.8% of occupied homes, roughly 33,000 households. Homes here have a median value of $311,800 and households a median income of $71,855. Those two numbers drive the labor adjustment in our estimate.
Yellowstone County had 21 hail days and 32 days with damaging thunderstorm winds from 2020 through 2025, according to NOAA storm records. The largest hail reported was 2.75 inches across. Hail flattens the thin aluminum fins on condenser coils and cuts airflow. After a big storm, take a look at the outdoor unit; homeowners insurance often covers the damage. In Billings, 18.4% of residents are 65 or older. For older adults, a house with no heat in January or no AC during a heat wave is a medical risk. Mention it when you call, since many companies put those calls first.
When It Makes Sense
- The house can't reach the thermostat setting on hot afternoons
- Summer electric bills keep going up
- It has had more than one refrigerant leak
- The AC is 12 to 15 years old or more
What Moves the Price
- Electrical work such as a new disconnect, breaker or wiring
- Whether the coil and line set also need replacing
- Tonnage, based on house size and local climate
- SEER2 rating and whether the compressor is single-stage or variable-speed
- The pad, permit and refrigerant (R-410A or the newer R-454B)
We lowered the national figures about 9% for Billings using local income, home values and the equipment size this climate needs. Real bids can still come in outside the range, so collect three written quotes.
What the Quote Should Cover
- Removing the old condenser and coil
- Startup, an airflow check and warranty registration
- The new condenser, coil and, if needed, line set
- Refrigerant charge and a leak test
- The electrical disconnect and wiring
Montana Permits, Efficiency Rules and Rebates
Montana falls in the DOE's North region. New split central air conditioners must meet at least 13.4 SEER2, and heat pumps sold anywhere in the U.S. need 14.3 SEER2 and 7.5 HSPF2. Equipment replacements in Billings generally need a mechanical permit, and a reputable contractor will pull it for you. Ask for their Montana license or registration number and a certificate of insurance with the quote. The federal 25C tax credit ended for equipment installed after December 31, 2025, so incentives now come mostly from utilities and state programs. Check your electric and gas utility's rebate page before you pick equipment.
Before You Hire
- Ask for a Manual J calculation. "Same size as the old one" isn't sizing.
- Buy the condenser and coil as a matched set, or you may void the manufacturer warranty.
- Ask what federal, state or utility incentives apply to the model you're quoted.
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AC Installation Questions from Billings Homeowners
How much is new AC installation in Billings?
Plan on $3,800 to $8,700, with most jobs near $6,500. Equipment efficiency, house size and the condition of the ducts and wiring decide where your quote falls.
When is the best time to schedule new AC installation in Billings?
Between late spring and early fall. Billings averages 142 freezing nights a year, and heating calls spike from November through February.
How long does a new AC last?
With yearly maintenance, 12 to 17 years. Salt air and extreme heat shorten that.
What size AC do I need?
It depends on square footage, insulation, windows and climate. The rough rule is a ton for every 450 to 650 sq ft, but only a Manual J calculation gives you a real number.
AC Installation Near Billings
- Bozeman $4,300 to $9,800
- Missoula $3,800 to $8,700
- Great Falls $3,500 to $7,900
- Butte $3,300 to $7,600
Sources: U.S. Census Bureau ACS 5-year estimates 2019-2023 and 2024 population estimates; NOAA NCEI U.S. Climate Normals 1991-2020, station Billings Logan International Airport; NOAA Storm Events Database 2020-2025, Yellowstone County. Prices are our estimates, not contractor quotes. Updated 2026.