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Sizing a heat pump for Union County means accounting for what happens to its output when outdoor temperatures fall hard. Homes in Union County, SD run heat about eight months a year, from October through May. A heat pump's capacity drops as the air gets colder, so a system that covers the house comfortably in October may fall short by February. The contractor doing the load calculation has to establish both the heating demand at design-day conditions and the point at which backup heat takes over, because those two numbers decide what gets installed. Get the first one wrong and the resistance heat strip carries the season.
Ductwork sized and routed for an older system does not automatically suit a heat pump, and in Union County a significant portion of the housing stock was built when equipment choices looked very different from what contractors install today. Half the homes in Union County, South Dakota were built in 1993 or earlier (2020-2024 ACS 5-year). That gap between what was put in at construction and what a heat pump draws on now is where installation decisions get made. A contractor has to assess whether the existing duct runs, their sizing, and the electrical service can support the new unit before the equipment itself becomes the question.
What Gets Installed With a New Heat Pump
The outdoor unit sits on a pad beside the house and holds the compressor and the heat exchanger that does the main work of the system. Inside, the air handler mounts in a utility space, a closet, or an attic and moves conditioned air through the home. Together those two pieces are the core of what a contractor puts in.
A refrigerant line set runs between the outdoor unit and the air handler, connecting the two along an exterior wall. A thermostat goes on an interior wall where it reads the living space and tells the system when to run. A condensate drain line carries moisture away from the air handler to a floor drain or outside.
The drawing shows a typical layout, and a licensed contractor determines exactly how each piece fits the house in front of them.
Find a contractor in Union CountyUnion County by the Numbers
118 severe weather events were recorded in Union 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 Union County, South Dakota were built in 1993 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesUnion County, South Dakota holds 7,588 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 73.1% of the occupied homes in Union County, South Dakota (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesSevere Weather Events in Union County by Year
The weather a heat pump works against shapes how hard it runs and how long it lasts. Sizing and installing equipment for Union County means accounting for what the local climate actually demands.
118 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.