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A contractor diagnosing a heat pump in Mellette County has to account for what the system has already been asked to carry before they can quote a repair. Homes in Mellette County, SD run heat about eight months a year, from October through May. Across a heating season that long, the compressor cycles repeatedly through temperatures where a heat pump's capacity is already under strain, and the reversing valve, the coil, and the refrigerant circuit all accumulate wear on the same schedule. When one part fails, a contractor checks the adjacent components too, because they have been under the same load and replacement of one item alone may not hold.

Ductwork that has served successive systems across a long history of hard winters collects debris, develops leaks at joints, and loses integrity in ways that show up as a heat pump problem before anyone opens the unit. Half the homes in Mellette County, South Dakota were built in 1969 or earlier (2020-2024 ACS 5-year). A contractor pulling a heat pump apart in a house from that era will find equipment faults, but the ductwork feeding it often explains why the same faults keep returning. Seals fail. Insulation thins. The repair on the unit is straightforward; what the ducts have quietly been doing to its performance is the finding that changes the scope of the job.
The Parts of a Heat Pump a Contractor Checks First

The outdoor unit holds the compressor and one set of coils, and it sits on a pad outside the house. The compressor is where contractors look when the system runs but moves no heat. The coils next to it are the first stop when the unit ices over or the refrigerant charge is off.
The air handler lives inside, usually in a utility closet or basement, and it pushes conditioned air through the house. The expansion valve sits between the two coil sets and controls refrigerant flow. The reversing valve, also inside the refrigerant loop, is what a contractor checks when the system heats in cooling mode or cools in heating mode.
The drawing shows a typical layout, and a licensed contractor determines what applies to your specific system and house.
Find a contractor in Mellette CountyMellette County, by the numbers
144 severe weather events were recorded in Mellette 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 Mellette 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 EstimatesMellette County, South Dakota holds 779 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 60.4% of the occupied homes in Mellette County, South Dakota (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesSevere Weather Events in Mellette County
Extreme weather puts heat pumps under strain, and how hard a system works over time shapes what repairs it eventually needs. Mellette County's weather record is part of what any contractor here has to account for.
144 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.