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A heat pump in this area works both sides of the year, but the heating load is where the mechanical strain lands hardest. Homes in Darlington County, SC run heat about five months a year, from November through March. Running in heating mode taxes the compressor and reversing valve in ways that cooling duty does not, because the refrigerant circuit is pushed through a different pressure regime and the outdoor coil is pulling heat from cold air. By the time a system shows a fault, those parts have a full season of hard cycling behind them, and a contractor diagnosing the failure will open that equipment knowing where the hours have accumulated.
Ductwork in houses this old carries a physical record of every system that has run through it, and that record shows up the moment a contractor opens a heat pump for repair. Half the homes in Darlington County, South Carolina were built in 1984 or earlier (2020-2024 ACS 5-year). Refrigerant pathways, coil condition, and what has accumulated on internal components all reflect what the ductwork has been doing around them for decades. A part that reads as failed in isolation often makes more sense once a contractor traces back through airflow restrictions the ducts have been imposing on the system. That context is what separates a single-component fix from a repair that holds.
The Parts of a Heat Pump a Contractor Checks First
The outdoor unit is the piece most homeowners can point to: a metal cabinet sitting on a pad beside the house, holding the compressor and the outdoor coil. The compressor is the heart of the system, and when it fails, the heat pump stops moving heat entirely. The outdoor coil is where that heat transfer happens, and a damaged or dirty coil shows up fast as a system that runs but does nothing useful.
Inside the house, the air handler holds the indoor coil and the blower fan, and this is where a contractor looks when the system is running but the air coming out feels wrong. The refrigerant lines connect the two units, and the expansion valve inside the system controls how refrigerant moves between them. A fault in either place can mimic a compressor problem, so a contractor works through both before drawing a conclusion.
The drawing shows a general layout of these components, and a licensed contractor determines what applies to the specific equipment and configuration in your house.
Get matched in Darlington CountyDarlington County, by the Numbers
159 severe weather events were recorded in Darlington County, South Carolina 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 Darlington County, South Carolina were built in 1984 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesDarlington County, South Carolina holds 29,763 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 70.9% of the occupied homes in Darlington County, South Carolina (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Governing Heat Pump Repair in Darlington County, South Carolina1 sourced rules and standards
Licensing Rules for HVAC Repair in Darlington County, South Carolina
South Carolina requires a mechanical contractor license for contracting work whose total cost of construction is greater than ten thousand dollars.
Severe Weather Events in Darlington County
Heat pump systems carry the full load of keeping a home comfortable through whatever the local climate delivers, and that workload is not the same everywhere. Weather stress shortens equipment life and drives repair needs, which is why storm history for Darlington County is a relevant starting point for understanding what local heat pumps are up against.
159 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.