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A heat pump in Bennett County runs its heating cycle hard, and the parts that wear under repeated cold-weather cycling are the compressor, the reversing valve, and the defrost controls. Homes in Bennett County, SD run heat about nine months a year, from September through May. Contractors diagnosing a failed or underperforming unit here typically find the compressor first on their list, because that component absorbs the mechanical cost of every heating cycle the system completes before the weather finally breaks. When a unit loses capacity gradually rather than stopping outright, the reversing valve is worth opening up early, since partial failures there mask themselves as low-output heating rather than a clean fault code.

Ductwork in a house of this vintage was sized and routed for whatever heating system the original builder put in, and a heat pump running through it today is working against geometry it did not choose. Half the homes in Bennett County, South Dakota were built in 1973 or earlier (2020-2024 ACS 5-year). When a contractor opens a heat pump here for diagnosis, the repair scope depends heavily on what that inherited infrastructure is doing to the system: restricted airflow starves a heat pump of what it needs to move heat, and the symptoms at the unit can look like a refrigerant or compressor problem until the ducts get checked.
The Parts of a Heat Pump a Contractor Checks First

The outdoor unit sits outside the house and holds the compressor and the condenser coil. The compressor is where most repair calls start. When it fails, the system loses its ability to move heat at all, and the outdoor unit may run continuously or not start. The condenser coil wraps around that cabinet, and a bent or dirty coil forces the compressor to work harder than it should.
Inside the house, the air handler holds the evaporator coil and the blower fan, which pulls household air across the coil and pushes conditioned air back through the vents. The reversing valve sits inside the outdoor unit and is what allows the system to switch between heating and cooling. The expansion valve and the refrigerant lines that run between the two units are also points a contractor checks when the system is losing capacity or cycling off before the house reaches the set temperature.
The drawing shows the general layout of a heat pump system, and a licensed contractor determines which components apply and what service they need in your specific house.
Find a contractor in Bennett CountyBennett County, by the numbers
161 severe weather events were recorded in Bennett 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 Bennett 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 EstimatesBennett County, South Dakota holds 1,151 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 61.2% of the occupied homes in Bennett County, South Dakota (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesSevere Weather Events in Bennett County
Extreme weather puts heat pumps under stress that ordinary use does not. How hard the equipment works, and how often it needs repair, is shaped by what the local climate actually delivers.
161 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.