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A heat pump here runs in heating mode for most of its life, which puts sustained wear on the reversing valve, the refrigerant circuit, and the defrost controls rather than spreading it evenly across the system. Homes in Weston County, WY run heat about nine months a year, from September through May. The reversing valve cycles every time the unit shifts between heating and defrost mode, and a system doing that through a full Wyoming winter accumulates wear on that component faster than any other single part. A contractor on a repair call in Weston County starts there, not at the thermostat or the air handler.

Stock built for an earlier generation of heating equipment has cycled through replacements the original house never anticipated. Half the homes in Weston County, Wyoming were built in 1974 or earlier (2020-2024 ACS 5-year). What that means for a repair job is concrete: once a contractor opens the unit, the question is whether the refrigerant fittings, the control boards, and the compressor components inside match anything a supplier still stocks. Older housing tends to hold older equipment longer, and parts for systems that have been out of production for years are not always findable at standard lead times. That gap between what the unit needs and what distributors carry is where a repair estimate can shift.
The Parts of a Heat Pump a Contractor Checks First

The outdoor unit holds the compressor and the condenser coil. It sits outside the house, usually on a pad at ground level or mounted to the wall. When a heat pump stops moving heat the way it should, the compressor and that coil are where a contractor starts.
Inside, the air handler contains the evaporator coil and the blower that pushes conditioned air into the house. The reversing valve, which is what lets the system run in both heating and cooling modes, lives in the outdoor unit as well and is a common point of failure when the system heats but will not cool, or the other way around. Refrigerant lines connect the two units and are checked whenever a coil or valve is in question.
The drawing shows a typical layout, and a licensed contractor determines which components apply to your specific system and what work each one needs.
Find a contractor in Weston CountyWeston County, by the numbers
275 severe weather events were recorded in Weston 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 Weston County, Wyoming were built in 1974 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesWeston County, Wyoming holds 3,406 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 86.8% of the occupied homes in Weston County, Wyoming (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesSevere Weather Events in Weston County
Extreme weather puts heat pumps under sustained stress, and equipment that runs hard through harsh conditions is equipment that fails sooner or needs more frequent repair. How much weather a county sees is a direct factor in how hard local contractors work and how often homeowners call them.
275 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.
