HVAC Installation in Lewistown, MT
A new system here will heat from September through June and cool from July through August every year. Tell us about the house, and a licensed contractor who covers Fergus County will get in touch.
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Ten months of heating in Fergus County
Your furnace here works most of the year. Homes in Lewistown need heat from September through June, and on winter nights that average 14°F, it runs hard to keep up. Only July and August ask for cooling, and even then afternoons average just 79°F. A new system still has to handle both jobs, but the furnace is doing the heavy lifting almost year round.
Winter here brings real weather. Fergus County saw 28 winter storms and 147 damaging wind events over the past ten years, and across Montana, 18% of households lost power for at least 24 hours in 2024. A furnace that shuts down when the power goes out leaves a house with no heat on the coldest nights. Whatever you install needs to be sized for 14°F lows and built to hold up through the storms that come with a Montana winter.
- 10 months
- September through June, your system heats
- 2 months
- July through August, it cools
- 14°F
- the average winter night it heats against
- 79°F
- the average summer afternoon it cools against
NOAA nClimDiv, 1991–2020 normals
Montana requires HVAC contractors to hold a state license.
The license is issued to the contractor, not to the job, so the same license covers this installation and the next one they do. Work under $2,500 falls outside that requirement, but a heating and cooling system installation runs well past that, so the contractor putting it in needs to hold the state license.
A permit and inspection from the local building office are the other piece of this. Most cities and counties require both when a furnace, air conditioner or heat pump gets replaced, and the inspection is what checks the work after it is done, separate from whatever the license already says about the contractor.
Source: Montana Legislature
- When should I replace my HVAC system?
- Replace it when repairs get frequent, the equipment is old, or it can't keep up on the coldest or hottest days. Parts get harder to find as a system ages, and efficiency drops off well before it fails completely. With winter lows here averaging 14°F, a furnace that struggles in cold weather is worth replacing before it leaves you without heat. A contractor can look at the age and condition of your system and tell you if repair still makes sense or if it's time to replace it.
- Should I replace my furnace and air conditioner at the same time?
- If both are old, replacing them together often makes sense, but it depends on the condition of each one. A furnace and air conditioner installed at the same time are matched to work together, and doing the job at once means only one round of ductwork checks and one inspection instead of two. Homes here need heat from September through June and cooling only in July and August, so the furnace carries most of the load and often wears out first. A contractor can check both systems and tell you whether one or both need to go.
- What happens during an HVAC installation?
- A contractor removes the old furnace or air conditioner, sets the new equipment, and connects it to your ductwork, gas line or electrical, and venting. They check that the ducts are sized right for the new unit, then test the system once it's running to make sure it's producing the airflow and temperature it's supposed to. In most cities and counties, this work needs a permit from the local building office and an inspection when it's done. Montana also requires the contractor doing the work to hold a state HVAC license, and a job like this is not the kind of small repair that falls under the state's cutoff for unlicensed work. A contractor will price the job once they see the house.