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A heat pump working a Lawrence County winter is running at the edge of its rated capacity for months at a stretch, not cycling briefly and resting. Homes in Lawrence County, SD run heat about ten months a year, from September through June. The refrigerant circuit and defrost controls carry that load directly: when outdoor temperatures drop hard, the system runs longer cycles and triggers defrost more often, which is where the compressor and reversing valve earn their wear. A contractor diagnosing a failed heat pump here checks those components first, because the heating season is where the hours stack up.

Stock built for equipment that no longer exists leaves a contractor opening a heat pump and working out whether what it needs can still be ordered. Half the homes in Lawrence County, South Dakota were built in 1987 or earlier (2020-2024 ACS 5-year). That gap between the building and what runs in it now is where repair jobs get complicated: a refrigerant line set, a control board, a reversing valve that fit a system from that era may have no current equivalent, and a contractor sourcing parts has to know what is still made before a repair scope can be priced.
The Parts of a Heat Pump a Contractor Checks First

The outdoor unit is where most repairs begin. It houses the compressor, which pressurizes the refrigerant, and the condenser coil, which releases or absorbs heat depending on the season. When a heat pump stops heating or cooling, or starts making noise, the compressor and that coil are where a contractor looks first.
Inside the house, the air handler holds the evaporator coil and the blower fan. The coil does the indoor heat exchange, and the fan pushes conditioned air through the home. Refrigerant lines run between the two units, and the reversing valve, which sits in the outdoor unit, is what lets the system switch between heating and cooling modes. That valve is a common repair point on its own.
The drawing shows a general layout of these components, and a licensed contractor determines which parts apply to your specific system and what work they actually need.
Find a contractor in Lawrence CountyLawrence County by the numbers
390 severe weather events were recorded in Lawrence 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 Lawrence County, South Dakota were built in 1987 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesLawrence County, South Dakota holds 14,840 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 65.1% of the occupied homes in Lawrence County, South Dakota (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesSevere Weather Events in Lawrence County
Heat pumps work harder when the weather turns extreme, and that workload shows up as wear. How often conditions push the equipment here in Lawrence County shapes how often repair becomes a real question.
390 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.