Furnace Repair in Great Falls, Montana
A furnace repair visit in Great Falls, MT usually costs $170 to $730. Where you land depends on the part. A flame sensor cleaning or a new ignitor sits at the low end, while a blower motor or control board pushes the bill toward the top.
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Great Falls Weather and HVAC Load
Great Falls logs 6,942 heating degree days and 421 cooling degree days in a normal year, based on the closest NOAA weather station. Heating is the bigger job here, and furnaces and heat pumps in Great Falls put in far more hours than the air conditioner. Count on roughly 143 nights below 32°F and 25 afternoons past 90°F in a typical year. Snowfall averages about 66 inches. For a 2,000 sq ft house, this climate points to a heating load somewhere near 70,000 BTU/h. Treat that as a starting number. A Manual J calculation will move it up or down based on insulation and windows.
| Heating degree days / year | 6,942 |
|---|---|
| Cooling degree days / year | 421 |
| Nights at or below 32°F | 143 |
| Days above 90°F | 25 |
| Average low / high | 35.1°F / 59°F |
Great Falls Housing Stock
Census figures put the median build year in Great Falls at 1965, so a typical house here has about 61 years on it. A lot of these homes are on their second or third system by now. The ductwork is usually original, and leaky joints are common. Great Falls has roughly 18,000 owner-occupied homes, or 68.4% of households. The median home value is $237,400, and median household income is $63,934. We use both figures to adjust labor and pricing for this page.
NOAA storm reports for Cascade County show 12 hail days and 22 days with damaging thunderstorm winds over the six years from 2020 to 2025. The largest hail reported was 3 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 Great Falls, 20% 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.
Symptoms Worth a Service Call
- Banging, squealing or rattling from the furnace
- Cold air coming out of the vents
- A yellow or flickering flame instead of a steady blue one
- The burners light, then shut off a few seconds later
- The blower won't stop running
What Moves the Price
- Night, weekend or holiday rates
- Whether the part is still under the manufacturer warranty
- Which part failed: a flame sensor costs far less than a control board or blower motor
- The diagnostic or service call fee
- The furnace's age and brand, which affect parts availability
For Great Falls we raised the national figures about 12%, based on local income, home values and climate-based equipment sizing. Get at least three written quotes; real bids can land outside this range.
What the Quote Should Cover
- Replacing the part that failed
- A diagnostic check
- A safety and combustion check
- A test run through a full heating cycle
Montana Licensing and Efficiency Rules
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. Most repairs don't need a permit. Anyone who opens the refrigerant circuit does need EPA Section 608 certification, and in Montana the company should carry a state license or registration. Ask for both.
Before You Hire
- Check the filter, the thermostat batteries and the breaker first. Those three cause a surprising number of no-heat calls.
- If the furnace is past 15, ask the tech to price both a repair and a replacement.
- Ask whether the diagnostic fee comes off the repair bill.
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Furnace Repair Questions from Great Falls Homeowners
What does furnace repair cost in Great Falls?
Most bills land between $170 and $730, including the service call. A typical visit is about $480. Night and weekend calls cost more.
What is the most common furnace repair?
Cleaning a dirty flame sensor or replacing a cracked hot-surface ignitor. They're also two of the cheapest repairs.
Should I repair or replace my furnace?
Here's a rule many techs use: multiply the furnace's age by the repair quote. If the number is over $5,000, replacing it usually makes more sense.
Furnace Repair Near Great Falls
Sources: U.S. Census Bureau ACS 5-year estimates 2019-2023 and 2024 population estimates; NOAA NCEI U.S. Climate Normals 1991-2020, station Great Falls 16st; NOAA Storm Events Database 2020-2025, Cascade County. Prices are our estimates, not contractor quotes. Updated 2026.