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A contractor diagnosing a heat pump in Walworth County checks the compressor and reversing valve before anything else, because those parts bear the full burden of heating work and show accumulated wear before other components do. Homes in Walworth County, SD run heat about nine months a year, from September through May. Cold outdoor air pushes a heat pump harder than mild air does, and a system that has been running near its capacity limit for months at a stretch will show stress in the compressor windings and the refrigerant circuit first. When capacity drops or the unit starts short-cycling, that mechanical history is usually where the repair begins.

Ductwork laid in for the original heating plant in a house this old was fitted around what existed then. Half the homes in Walworth County, South Dakota were built in 1969 or earlier (2020-2024 ACS 5-year). When a repair opens a heat pump in stock like this, a contractor often finds the duct connections at the air handler pulling away, flex runs that have collapsed in sections, or return paths too small to move the volume the system needs. Those conditions change the repair scope. A refrigerant issue stays a refrigerant issue; a refrigerant issue sitting inside a duct system that starves the coil becomes a pattern of repeat failures.
The Parts of a Heat Pump a Contractor Checks First

The outdoor unit sits outside the house and holds the compressor and one set of coils. The compressor is where most mechanical failures start, so it is the first thing a contractor listens and tests for. The coils beside it transfer heat, and when they are damaged or fouled, the whole system labors.
Inside the house, the air handler pushes conditioned air through the home and contains a second set of coils along with the blower motor. The reversing valve, which lives in the outdoor unit, is what lets a heat pump move heat in either direction, and a stuck or leaking valve is a common reason a system heats in one season but not the other. The refrigerant lines that run between the two units and the thermostat that signals them round out what a contractor examines.
The drawing shows the general layout of a heat pump system, and a licensed contractor determines which components and conditions apply to your particular house.
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164 severe weather events were recorded in Walworth 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 Walworth County, South Dakota were built in 1969 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesWalworth County, South Dakota holds 2,932 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 76.2% of the occupied homes in Walworth County, South Dakota (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesSevere Weather Events in Walworth County
Extreme weather puts heat pumps under load they were not built to sustain indefinitely. Repair needs in Walworth County track closely with what the climate asks of the equipment, which is why local weather patterns are part of the picture here.
164 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.