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A heat pump running through a long heating season puts its hardest miles on the compressor and the reversing valve, both of which cycle repeatedly as outdoor temperatures drop. Homes in Perkins County, SD run heat about nine months a year, from September through May. Capacity falls as temperatures fall, which means the compressor is working against its own limits on the coldest days, not coasting. A contractor called out for a repair here checks the reversing valve function and compressor draw early, because those are the parts that carry the load when the system is working hardest.

Ductwork routed for earlier systems, electrical service sized for smaller loads, and repair histories layered over decades of equipment changes are what a contractor finds once a heat pump in this county is open. Half the homes in Perkins County, South Dakota were built in 1966 or earlier (2020-2024 ACS 5-year). That depth of accumulated change means the diagnosis lives inside the unit, not on the work order a homeowner describes over the phone. A refrigerant leak reads one way on paper and another once the coil is visible and the previous patch is sitting right there.
The Parts of a Heat Pump a Contractor Checks First

The outdoor unit is the piece most homeowners recognize, a metal cabinet sitting on a pad beside the house that holds the compressor and the outdoor coil. The compressor is the heart of the system, and when a heat pump stops moving heat the way it should, that cabinet is where a contractor starts. A failed compressor, a refrigerant leak at the outdoor coil, or a worn contactor all show up here.
Inside the house, the air handler holds the indoor coil and the blower that pushes conditioned air through the home. The reversing valve, which lets the system heat in winter and cool in summer, sits in the refrigerant line and is a common target when a heat pump runs but produces the wrong temperature. The expansion valve and the refrigerant lines connecting the two units round out what a contractor traces when diagnosing a problem.
The drawing shows the general layout of a heat pump system, and a licensed contractor determines which components and conditions apply to your specific home.
Find a contractor in Perkins CountyPerkins County, by the numbers
327 severe weather events were recorded in Perkins County, South Dakota 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 Perkins County, South Dakota were built in 1966 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesPerkins County, South Dakota holds 1,744 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 78.4% of the occupied homes in Perkins County, South Dakota (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesSevere Weather Events in Perkins County
Extreme weather puts heat pumps under stress they were not sized to ignore. How hard a system works, how often it cycles, and how long it holds up before needing repair are all shaped by what the local climate actually delivers.
327 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.