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A heat pump running a repair call in Fall River County has almost certainly been cycling hard through cold weather for a long time before anything broke. Homes in Fall River County, SD run heat about nine months a year, from September through May. The compressor bears the heaviest share of that load, since capacity drops as outdoor temperatures fall and the unit works harder to pull heat from cold air. The reversing valve cycles with every mode switch and accumulates wear that outdoor-only inspection misses. A contractor opening the cabinet here checks both before quoting anything else.

Ductwork routed for the original equipment in a house this old has been adapted more than once, and each adaptation leaves its own set of junctions, seals, and oddities for a contractor to work through before they can assess the heat pump itself. Half the homes in Fall River County, South Dakota were built in 1972 or earlier (2020-2024 ACS 5-year). That means a repair call here often turns on what the contractor finds once the cabinet is open: whether the refrigerant lines are the right gauge, whether the wiring was ever brought up to what the current unit requires, and whether any prior field repair left components that are now part of the failure. Parts sourcing runs into the same history, because a system that has lived in adapted infrastructure tends to show wear in ways that a clean original installation does not.
The Parts of a Heat Pump a Contractor Checks First

The outdoor unit is where most repair calls begin. It houses the compressor, which moves refrigerant through the system, and the condenser coil, which sits wrapped around the unit's interior. When the compressor fails, the system stops moving heat altogether. When the coil is damaged or blocked, the unit runs but produces little effect indoors.
Inside the house, the air handler holds the evaporator coil and the blower motor. The coil absorbs or releases heat depending on the season, and the blower pushes conditioned air through the home. The reversing valve, which sits in the outdoor unit, is what lets the system shift between heating and cooling. A fault there shows up as a system stuck in one mode.
The drawing shows a typical layout, and a licensed contractor determines which components are involved in your specific situation.
Find a contractor in Fall River CountyFall River County by the Numbers
330 severe weather events were recorded in Fall River 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 Fall River County, South Dakota were built in 1972 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesFall River County, South Dakota holds 4,093 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 72.4% of the occupied homes in Fall River County, South Dakota (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesWeather Stress on HVAC Equipment in Fall River County
Extreme weather events put real strain on heat pump systems, forcing them to run harder and longer than they were sized to handle. How much strain depends on where you are, and Fall River County has its own record.
330 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.