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A heat pump repair in Bon Homme County starts with the refrigerant circuit and the reversing valve, not with the secondary components. Homes in Bon Homme County, SD run heat about eight months a year, from October through May. Through those months the outdoor coil operates at low ambient temperatures where capacity is already strained, and the reversing valve cycles between heating and cooling mode at the shoulders of the season. A contractor checking a system that has been running hard through a South Dakota winter will look at refrigerant charge and valve function before anything else, because that is where the load lands.

Opened equipment in a house this old often reveals a system whose replacement parts sit at the edge of what suppliers still stock. Half the homes in Bon Homme County, South Dakota were built in 1958 or earlier (2020-2024 ACS 5-year). That depth of housing history means the unit a contractor opens has likely been swapped out at least once from whatever ran here originally, and the parts it takes now may be a generation behind current production. A contractor repairing a heat pump here checks parts availability before quoting a repair, because a fix that looks straightforward on a newer system can stall on sourcing alone.
The Parts of a Heat Pump a Contractor Checks First

The outdoor unit is where most diagnostic work begins. It houses the compressor, which is the heart of the system, along with the outdoor coil and a fan that pulls air across it. When the system stops heating or cooling, or makes noise it did not make before, the compressor and the outdoor coil are the first places a contractor looks.
Inside the house, the air handler holds the indoor coil and the blower that pushes conditioned air through your home. The refrigerant lines run between the two units, and the reversing valve inside the system is what lets a heat pump shift between heating and cooling. A faulty reversing valve is a common reason a heat pump works in one mode but not the other.
The drawing shows a typical heat pump layout, and a licensed contractor will assess exactly which components apply to your specific setup.
Find a contractor in Bon Homme CountyBon Homme County by the numbers
135 severe weather events were recorded in Bon Homme 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 Bon Homme County, South Dakota were built in 1958 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesBon Homme County, South Dakota holds 2,842 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 80.5% of the occupied homes in Bon Homme County, South Dakota (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesSevere Weather Events in Bon Homme County
Extreme weather puts heat pumps under load they were not sized to ignore, and repeated stress is where repair needs start. How hard the weather hits Bon Homme County is a local factor that shapes how hard the equipment works.
135 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.