Furnace Installation in Kalispell, MT
A new furnace here will run from August through June every year. Tell us about the house, and a licensed contractor who covers Flathead County will get in touch.
Tell us about the job
It takes about a minute.
Kalispell asks a furnace to run almost all year
Winter nights here average 17°F, and homes need heat from August through June. That's 11 months of the year the furnace has to be ready to run.
Any non-weatherized gas furnace made since November 2015 has to reach at least 80 percent AFUE. That's the federal floor, not a mark of how well suited it is to a Flathead County winter. Power matters too. In 2024, 18% of Montana households lost power for 24 hours or more, and the last ten years brought 124 winter storms and 69 damaging wind events to the state. A furnace installed here has to hold up through that kind of weather, not just the easy nights.
- 11 months
- August through June, your furnace is on duty
- 17°F
- the average winter night it heats against
- 80% AFUE
- the federal minimum any new unit must meet
NOAA nClimDiv, 1991–2020 normals
A high-efficiency gas furnace would save about $90 a year to run in Flathead County compared with a gas furnace.
Estimates for a typical Flathead County home, from EIA household energy data, Montana fuel prices and NOAA climate normals. Your home will differ.
Montana requires HVAC contractors to hold a state license.
Montana licenses HVAC contractors through the Department of Labor and Industry. The state tests the contractor and keeps that record on file, but the license covers the contractor, not each job. Work under $2,500 does not need a licensed contractor here. A furnace installation runs well past that, so this job falls inside what the state expects a licensed contractor to hold.
The license covers who is allowed to do the work. Most cities and counties also require a permit for a furnace installation, and the local building office inspects the job once it is done, including the gas connection and venting that make the difference between a furnace that runs safely and one that does not. In Flathead County, 43.4% of homes heat with gas, and that inspection is what checks the part of the job that can actually hurt someone.
Source: Montana Legislature
- What size furnace does my house need?
- That depends on your square footage, your insulation, your windows, and how your house is laid out, so it takes a load calculation to get right. A contractor measures the house and figures the exact heat loss rather than going by a rule of thumb. Getting this right matters here, since your house needs heat from August through June and winter nights average 17°F. Too small and it runs constantly without keeping up. Too large and it short cycles, wearing out parts faster and leaving rooms uneven.
- How do I know it's time to replace my furnace?
- Age is one thing to look at, especially on a furnace running nearly year round like it does here, needing heat from August through June. Rising repair calls are another sign, particularly if the same part keeps failing or a repair would cost close to what a new unit runs. Uneven heat, a burner flame that looks yellow instead of blue, or a furnace that cycles on and off too often all point the same direction. A contractor can look at the actual unit and tell you whether it is worth repairing again or time to install new.
- Is a high-efficiency furnace worth it?
- For a house that needs heat 11 months of the year, a high-efficiency furnace has a lot more months to earn back the difference than it would somewhere with a short winter. Any non-weatherized gas furnace built since November 2015 has to reach at least 80 percent AFUE, so even a standard model here is not wasting huge amounts of gas. A high-efficiency furnace burns less gas for the same heat over a heating season this long. Whether the extra cost makes sense for your house is something a contractor can work through with you, since it depends on your gas use and how long you plan to stay in the house.