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Sizing a heat pump for a Horry County home starts with what the outdoor temperature does to the unit's capacity, not just how big the house is. Homes in Horry County, SC run heat about five months a year, from November through March. A heat pump loses heating output as temperatures drop, so the contractor has to establish where that capacity floor lands for this address before they can specify the right backup resistance or fossil-fuel stage. Get the sizing wrong and the backup runs constantly through the cold months, driving bills up and wearing a secondary element that was meant to cover edge cases. The load calculation is what ties the equipment choice to this county's actual winter demand.
Ductwork sized and routed for older equipment does not automatically carry a heat pump's airflow patterns, and in Horry County that gap is where installations get complicated. Half the homes in Horry County, South Carolina were built in 1999 or earlier (2020-2024 ACS 5-year). A contractor pricing a heat pump here has to assess what the existing ducts actually do with the air volume a heat pump moves, because an undersized or poorly routed trunk will limit performance regardless of what unit sits on top of it. The electrical service is a separate question, and a panel that was adequate for the original system may need an upgrade to meet what a new heat pump draws.
What Gets Installed With a New Heat Pump
The outdoor unit is the piece most homeowners notice first. It sits on a pad beside the house and holds the compressor and the outdoor coil, which together do the heavy work of moving heat in or out depending on the season. Inside, the air handler mounts in a utility closet, attic, or basement and pushes conditioned air through the home.
A refrigerant line set runs between the two units, carrying the refrigerant that ties the outdoor and indoor sides together. The thermostat goes on an interior wall and gives the homeowner control over the whole system. Some installations also include a supplemental heat strip inside the air handler for the coldest days.
The drawing shows a typical layout, and a licensed contractor determines exactly what applies to this house.
Get matched in Horry CountyHorry County, by the numbers
211 severe weather events were recorded in Horry 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 Horry County, South Carolina were built in 1999 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesHorry County, South Carolina holds 217,419 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 77.3% of the occupied homes in Horry County, South Carolina (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesHeat Pump Installation Rules for Horry County, South Carolina1 codes, standards, and licensing rules
Licensing Rules for Horry 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 Horry County
Horry County's climate puts real demands on heating and cooling equipment, and those demands show up in the local weather record. A heat pump sized and installed for this area has to hold up to what this county actually gets.
211 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.