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A heat pump here earns its wear in winter, running in heating mode through months that most cooling-climate units never see. Homes in Douglas County, SD run heat about eight months a year, from October through May. The reversing valve cycles every time the system switches between heating and defrost mode, and a season this long gives it a high cycle count before spring arrives. Refrigerant charge shifts under sustained cold, and a low-charge fault that starts in January rarely announces itself until the system is already struggling. Contractors diagnosing a repair in this county look at the reversing valve and the refrigerant circuit first, because that is where the heating load lands.

Ductwork that has been patched, re-routed, or simply left from an earlier system tells a contractor more about a heat pump repair job than the unit's age does. Half the homes in Douglas County, South Dakota were built in 1960 or earlier (2020-2024 ACS 5-year). Housing built that long ago has typically had its mechanical systems changed at least once, and the ductwork and refrigerant lines threading through it carry the evidence: crimped flex runs, mismatched fittings, insulation that has compressed or separated. When a heat pump loses capacity or cycles erratically, a contractor opening the system in a house like this checks that infrastructure before pricing parts, because a failing component can trace back to airflow restriction built into the ductwork decades before the current unit was installed.
The Parts of a Heat Pump a Contractor Checks First

The outdoor unit sits on a pad beside the house and holds the compressor and the outdoor coil. These are where most problems show up. A failed compressor stops the system entirely; a damaged or dirty coil makes it work harder and cool or heat poorly. A contractor looks here first.
Inside the house, the air handler moves conditioned air through the home and contains the indoor coil and the blower motor. The reversing valve, which sits inside the outdoor unit, is what lets a heat pump switch between heating and cooling. When that valve sticks, the system runs but delivers the wrong temperature. The refrigerant lines connecting both units are also checked for leaks.
The drawing shows the general layout of a heat pump system, and a licensed contractor determines which components apply to the specific setup in your house.
Find a contractor in Douglas CountyDouglas County by the numbers
125 severe weather events were recorded in Douglas 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 Douglas County, South Dakota were built in 1960 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesDouglas County, South Dakota holds 1,338 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 76.7% of the occupied homes in Douglas County, South Dakota (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesSevere Weather Events in Douglas County
Extreme weather puts heat pumps under sustained stress, and the repair picture in any area follows from how hard the climate pushes the equipment. What holds for Douglas County differs from what holds elsewhere, which is why local service history matters.
125 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.