Furnace Installation in Miles City, MT
A new furnace here will run from September through May every year. Tell us about the house, and a licensed contractor who covers Custer County will get in touch.
Tell us about the job
It takes about a minute.
Nine months of heat, down to 11 degrees
In Custer County, a furnace works from September through May. Winter nights average 11°F, and that is the average, not the coldest it gets. A new furnace here is sized and installed for that kind of cold, not for a mild snap now and then.
Most homes in Miles City heat with gas, and any new non-weatherized gas furnace has to reach at least 80 percent AFUE by federal rule. Power matters too. Across Montana, about 18 percent of households lost power for a full day or more in 2024, and this area has logged 17 winter storms and 94 damaging wind events over the past ten years. A furnace installed here should be set up to start back up on its own once power returns.
- 9 months
- September through May, your furnace is on duty
- 11°F
- the average winter night it heats against
- 62%
- of homes here heat with gas, so most furnaces here burn gas
- 80% AFUE
- the federal minimum any new unit must meet
NOAA nClimDiv, 1991–2020 normals
A high-efficiency gas furnace would save about $70 a year to run in Custer County compared with a gas furnace.
Estimates for a typical Custer 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.
The Department of Labor and Industry tests and records the contractor holding this license. It belongs to the contractor, not to any single job. Montana draws a line at $2,500. Work under that does not need a licensed contractor. A furnace installation runs well past that mark, so the contractor doing this job should hold the state license.
The license covers who is allowed to do the work. It does not cover the installation itself. That comes from the local building office in Custer County, which issues a permit for a furnace replacement and inspects it once the work is done. Most homes in Custer County heat with gas, and that inspection is what catches a bad gas connection before it becomes dangerous.
Source: Montana Legislature
- What size furnace does my house need?
- The right size depends on your square footage, your insulation, your windows, and your ceiling height, so there's no number that works for every house. A contractor works this out with a load calculation, which looks at the whole house rather than just floor space. This matters more here than in a mild climate, since winter nights average 11°F and the furnace has to keep up from September through May. Too big and it short cycles. Too small and it runs constantly without keeping the house warm.
- How do I know it's time to replace my furnace?
- Age is the first thing to look at. Furnaces installed new gas units built since November 2015 to run at least 80 percent AFUE, so if yours is older than that, it may be burning more fuel than it needs to. Rising repair frequency is the other sign. If you're calling for service every winter, or a repair is going to cost a large share of what a new furnace would, replacement usually makes more sense than another patch. With heat needed here nine months of the year, a furnace that's struggling doesn't get much rest to recover.
- Is a high-efficiency furnace worth it?
- It depends on how long you plan to stay in the house and what you're replacing. A high-efficiency furnace burns less gas to produce the same heat, which matters in a place where the furnace runs from September through May. Since 61.9 percent of homes in Custer County heat with gas, that efficiency difference shows up on more bills here than in a place that leans electric. A contractor can walk you through the actual efficiency ratings and price the job for your house.