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Sizing a heat pump for Teton County requires knowing what happens to its output when outdoor temperatures drop hardest, because capacity falls as the cold deepens and a unit that looks adequate on paper can fall short when the heating load peaks. Homes in Teton County, MT run heat about ten months a year, from September through June. The compressor and the reversing valve carry that load across most of the calendar, and a contractor has to establish how much capacity the chosen unit retains at the coldest design temperature before the quote means anything. Backup heat sizing follows from that calculation, not from a guess.
Ductwork laid out for a furnace moves air differently than a heat pump needs it to, and when most of the housing stock has been carrying that original configuration for a long time, the duct layout becomes the first thing a contractor prices, not the last. Half the homes in Teton County, Montana were built in 1962 or earlier (2020-2024 ACS 5-year). A heat pump installation on stock like this turns on whether the existing runs can handle the distribution a heat pump demands, and whether the electrical service will carry the load. Those are the two variables a contractor opens up and measures before anything else is quoted.
What Gets Installed With a New Heat Pump
The outdoor unit is the piece most homeowners notice first. It sits on a concrete pad or wall bracket outside the house and holds the compressor and the outdoor coil. Inside, an air handler mounts in a utility space, closet, or attic and moves conditioned air through the home.
A refrigerant line set runs between the two units, carrying the working fluid that lets the system do its job. A thermostat goes on an interior wall where it reads the living space and tells the system when to run. Some installations also include a disconnect box on the exterior wall beside the outdoor unit.
The drawing shows a typical layout, and a licensed contractor determines what applies to your specific house.
Find a contractor in Teton CountyTeton County, Montana, by the numbers
206 severe weather events were recorded in Teton County, Montana between 2015 and 2024.
NOAA National Centers for Environmental Information, Storm Events Database, bulk CSV export, events 2015-01-01 through 2024-12-31.Half the homes in Teton County, Montana were built in 1962 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesTeton County, Montana holds 2,945 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 75.5% of the occupied homes in Teton County, Montana (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesHeat Pump Installation Rules for Teton County, Montana2 sourced rules and standards
Licensing and Legal Requirements in Teton County, Montana
Montana’s contractor licence does not reach a casual, minor or inconsequential job whose total price for labour, materials and everything else is less than $2,500 — and the exemption is lost if the work is only part of a larger operation, or if a job is divided up to get under the figure.
Montana requires a current construction contractor licence from the Department of Labor and Industry: an individual or business may not engage in business as a construction contractor without one.
Severe Weather Events in Teton County
Extreme weather puts a direct load on heating and cooling equipment, and how hard a heat pump has to work is a function of local conditions. That makes the weather record in {county} a practical reference point for anyone sizing or installing equipment here.
206 severe weather events, 2016–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.