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On a heat pump repair call in Harding County, a contractor starts with the compressor and the reversing valve before anything else. Homes in Harding County, SD run heat about nine months a year, from September through May. Cold outdoor air pushes a heat pump toward the lower edge of its operating range, and the compressor cycles hard to keep up. That sustained load wears the compressor and its contacts faster than the refrigerant lines or the air handler. A contractor who skips straight to a refrigerant check without testing the compressor under load is working in the wrong order.
The house has already answered one version of this question. Half the homes in Harding County, South Dakota were built in 1973 or earlier (2020-2024 ACS 5-year). A heat pump now running in stock like that is almost certainly the second or third mechanical generation to live in those walls, and each changeover left something behind: a splice, a field-modified connection, a section of ductwork re-routed to fit something it was not designed for. When a system opens up, a contractor is sorting through that accumulated history to find what actually failed, and whether the part it needs is still in supply for a unit of that vintage.
The Parts of a Heat Pump a Contractor Checks First
The outdoor unit is the piece most homeowners recognize, sitting on a pad beside the house and holding the compressor and condenser coil. The compressor is where most serious failures start. When it labors, shorts, or seizes, the system loses its ability to move heat at all. The condenser coil surrounds it, and a bent, dirty, or corroded coil forces the compressor to work harder than it should.
Inside the house, the air handler contains the blower motor and the evaporator coil. The blower pushes conditioned air through the home, so a failing motor shows up as weak or absent airflow. The expansion valve sits between the two coils and controls refrigerant flow. A contractor also checks the reversing valve, which is what allows a heat pump to heat and cool, because a stuck reversing valve leaves the system locked in one mode.
The drawing shows a general layout of these components, and a licensed contractor determines what applies to the specific system and setup in your home.
Find a contractor in Harding CountyHarding County, by the numbers
326 severe weather events were recorded in Harding 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 Harding County, South Dakota were built in 1973 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesHarding County, South Dakota holds 688 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 76.5% of the occupied homes in Harding County, South Dakota (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesSevere Weather Events in Harding County
Extreme weather puts heat pumps under stress that routine use does not. How often that pressure arrives in your county shapes how hard local equipment works and how quickly wear accumulates.
326 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.