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A contractor diagnosing a heat pump here starts with the refrigerant circuit and the reversing valve, because those components carry the load through a long heating season where the equipment rarely goes idle. Homes in Haakon County, SD run heat about eight months a year, from October through May. As outdoor temperatures drop, a heat pump's capacity falls, which means the system cycles harder and longer to hold indoor temperatures, and the reversing valve toggles through that every single day. By the time a repair call comes in, the compressor and the valve have already logged the kind of accumulated stress that shows up as refrigerant loss, valve sticking, or compressor draw that reads outside spec.

Half the homes in Haakon County, South Dakota were built in 1974 or earlier (2020-2024 ACS 5-year). A heat pump running in a house from that era was almost certainly installed to replace something else, which means the system inside it has already been adapted at least once. When a repair opens that unit, what matters is whether the compressor, the reversing valve, or the control board it needs is still being manufactured. Older refrigerant lines and proprietary components from discontinued product runs can turn a straightforward repair into a parts search that determines whether the system is worth fixing at all.
The Parts of a Heat Pump a Contractor Checks First

The outdoor unit is usually where a contractor starts. It houses the compressor, which does the hardest mechanical work in the system, and the outdoor coil, which transfers heat. When the compressor runs rough or not at all, or when the coil is damaged or blocked, the whole system feels it.
Inside the house, the air handler moves conditioned air through the home and holds the indoor coil and the blower. The reversing valve, which sits in the outdoor unit, controls the direction of the refrigerant flow and is a common point of failure when the system heats in one mode but not the other. The refrigerant lines connecting both units can also develop leaks that a contractor will check.
The drawing shows a general layout of these components, and a licensed contractor determines what applies to the specific equipment and configuration in your home.
Find a contractor in Haakon CountyHaakon County, by the numbers
267 severe weather events were recorded in Haakon 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 Haakon County, South Dakota were built in 1974 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesHaakon County, South Dakota holds 895 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 79.2% of the occupied homes in Haakon County, South Dakota (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesSevere Weather Events in Haakon County
Weather in this part of South Dakota puts real stress on heat pump systems, cycling them hard through conditions they have to work against. A unit that carries that load year after year is one where wear shows up faster, and where repair decisions are tied directly to what the local climate demands.
267 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.