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Sizing a heat pump for this county means working out where outdoor temperatures push the unit below useful output, and what backup heat has to cover when that happens. Homes in Teton County, WY run heat in every month of the year. The refrigerant circuit is doing heating work across the whole calendar, which means the compressor, the reversing valve, and the defrost controls are all accumulating wear without a long idle stretch to obscure early faults. A contractor quoting the job here has to treat the low-end capacity curve as a local question, not a spec-sheet assumption, because an undersized unit will run hard and fall short on the coldest days rather than coast through them.

Ductwork laid in for an older forced-air system carries assumptions about airflow, return capacity, and routing that a heat pump does not share. Half the homes in Teton County, Wyoming were built in 1989 or earlier (2020-2024 ACS 5-year). A contractor pricing a heat pump installation in a house from that era of the stock has to assess whether the existing duct layout can actually deliver the volumes a heat pump moves, and in many cases it cannot without modification. The electrical service raises a parallel question: panels in houses of that vintage were sized for loads that predate modern heat pump draws, and what is already in the wall may not be enough. The equipment selection happens after those two answers come in.
What Gets Installed With a New Heat Pump

The outdoor unit is the piece most homeowners notice first. It sits on a pad beside the house and holds the compressor and the outdoor coil, which do the core work of moving heat between the refrigerant and the outside air. Inside, the air handler mounts in a utility closet, basement, or attic and pushes conditioned air through the home.
A refrigerant line set runs between the two units, carrying refrigerant back and forth through insulated copper tubing. The thermostat goes on an interior wall and gives the homeowner control over the whole system. A condensate drain line runs from the air handler to carry away moisture that collects during cooling.
The drawing shows a typical layout, and a licensed contractor determines exactly how each piece fits the setup in your home.
Find a contractor in Teton CountyTeton County, by the numbers
231 severe weather events were recorded in Teton County, Wyoming 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, Wyoming were built in 1989 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesTeton County, Wyoming holds 13,658 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 58.3% of the occupied homes in Teton County, Wyoming (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesSevere Weather Events in Teton County
Extreme weather puts direct demands on heating and cooling equipment, affecting how hard a heat pump has to work and how long it holds up under that load. What happens in Teton County shapes what a properly sized and installed system needs to handle.
231 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.
