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Sizing a heat pump for a Greenwood County home is where an installation either holds together or quietly starts to fail. Homes in Greenwood County, SC run heat about five months a year, from November through March. The compressor carries the full heating load through those months, and as outdoor temperatures drop toward freezing, a heat pump's output falls with them. A contractor has to run a load calculation that accounts for the house envelope, not just its square footage, before they can specify the right equipment and the right backup heat source. Get the sizing wrong and the backup strips run hard every cold snap, driving the electric bill up while the heat pump itself never quite keeps pace.
Ductwork sized and sealed for a previous generation of equipment is what a contractor runs into on a significant share of jobs here. Half the homes in Greenwood County, South Carolina were built in 1977 or earlier (2020-2024 ACS 5-year). That matters for heat pump installation specifically because a heat pump moves air differently than the systems much of this housing was built around, and duct runs that handled the old load without complaint can starve the new unit or drive up static pressure until efficiency drops. The electrical service is the second check: panels in houses of this vintage were not sized for the draw a modern heat pump puts on them. Both get measured before anything is quoted.
What Gets Installed With a New Heat Pump
The outdoor unit is the piece a homeowner sees first, sitting on a pad beside the house. It holds the compressor and the outdoor coil, and it is where heat moves in or out depending on the season. The indoor air handler mounts inside, usually in a closet, attic, or utility space, and it pushes conditioned air through the home.
A refrigerant line set runs between the two units, carrying the working fluid back and forth through copper tubing wrapped in insulation. A thermostat goes on an interior wall and gives the homeowner control over the whole system. The disconnect box mounts near the outdoor unit and lets a contractor cut power to it safely.
The drawing shows a typical layout, and a licensed contractor determines exactly what applies to this house.
Get matched in Greenwood CountyGreenwood County, by the numbers
69 severe weather events were recorded in Greenwood 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 Greenwood County, South Carolina were built in 1977 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesGreenwood County, South Carolina holds 31,702 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 67.0% of the occupied homes in Greenwood County, South Carolina (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Governing Heat Pump Installation in Greenwood County, South Carolina1 sourced rules and standards
Licensing and Legal Requirements in Greenwood 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 Greenwood County
Greenwood County's climate puts real demand on heating and cooling equipment, and weather pressure is part of what determines how hard a heat pump works over its life. That load profile is a local fact, which is why installation decisions here are not the same as they would be somewhere else.
69 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.