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The reversing valve and refrigerant circuit in a heat pump carry the full weight of the heating load in this county. Homes in McCook County, SD run heat about nine months a year, from September through May. That sustained demand cycles the compressor through more heating-mode starts than most residential heat pumps are sized around, and the reversing valve, which toggles the system between heating and cooling, is what a contractor checks first when a unit here starts losing capacity or short-cycling. Refrigerant charge drift, coil fouling, and valve wear all show up earlier on a system that has spent most of its life working against cold outdoor air.
Half the homes in McCook County, South Dakota were built in 1970 or earlier (2020-2024 ACS 5-year). A house that old has likely run more than one heating and cooling system in its lifetime, and what a contractor opens up reflects that layered history. The refrigerant circuit, the reversing valve, the coil condition: whatever is in there now is the product of prior repairs and replacements, and the parts it requires may sit well outside current production runs. That is the thing a contractor has to establish before a quote means anything.
The Parts of a Heat Pump a Contractor Checks First
The outdoor unit sits outside the house and holds the compressor and condenser coil. The compressor is the part contractors go to first when a heat pump stops moving heat effectively, because it does the pressurizing work the whole system depends on. The condenser coil wraps around the inside of that cabinet, and a bent, corroded, or iced-over coil is one of the more common reasons a heat pump underperforms.
The indoor air handler mounts inside the house, usually in a utility closet, attic, or basement, and it contains the evaporator coil and the blower. The blower pushes conditioned air through the home, and a failing motor or a clogged coil shows up as weak airflow or uneven temperatures room to room. The reversing valve, also inside the refrigerant circuit, is what lets a heat pump switch between heating and cooling, and a stuck valve is one reason a system runs but only does one job.
The drawing shows the general layout of a heat pump system, and a licensed contractor determines what applies to the specific equipment and configuration in your home.
Find a contractor in McCook CountyMcCook County, by the numbers
130 severe weather events were recorded in McCook 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 McCook County, South Dakota were built in 1970 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesMcCook County, South Dakota holds 2,473 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 79.5% of the occupied homes in McCook County, South Dakota (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesSevere Weather Events in McCook County
South Dakota weather puts real stress on heat pump systems, and McCook County gets its share of the conditions that shorten equipment life and push components toward failure. Repair demand here follows the weather, which makes local pattern a practical factor in keeping a heat pump running.
130 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.