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Sizing a heat pump for a house in Marlboro County starts with what the coldest nights actually demand, because a heat pump loses capacity as outdoor temperatures drop and back-up heat is not optional on those days. Homes in Marlboro County, SC run heat about five months a year, from November through March. The compressor and the reversing valve carry the full heating load through those months, and a unit that is undersized will not degrade gradually enough to warn anyone. It runs at its limit until it fails. A contractor quoting this job has to run a proper load calculation against the house envelope before settling on equipment size, because the mild shoulder months will not surface a mismatch until the weather turns hard.
Ductwork sized and sealed for an older system can become the binding constraint on a heat pump installation, and in Marlboro County that constraint is common enough to be the first thing a contractor prices, not the last. Half the homes in Marlboro County, South Carolina were built in 1977 or earlier (2020-2024 ACS 5-year). What that means for an installation job is that the ducts running through the walls and attic of a typical house here were built around equipment with different airflow and static pressure requirements than what a heat pump needs. A contractor who quotes only the unit and skips the duct assessment sends a homeowner a number that changes once the walls are open.
What Gets Installed With a New Heat Pump
The outdoor unit is the piece most homeowners see first. It sits on a pad beside the house and holds the compressor and the outdoor coil, which are the core of the system. Inside, the air handler mounts in a utility space, closet, or attic and moves conditioned air through the home.
A refrigerant line set runs between the two units, connecting the outdoor pad to the air handler through an exterior wall. The thermostat goes on an interior wall and gives the homeowner control over the whole system. A condensate drain line runs from the air handler to carry away moisture the indoor coil pulls from the air.
The drawing shows the general layout of a heat pump system, and a licensed contractor determines what applies to this particular house.
Get matched in Marlboro CountyMarlboro County, by the numbers
83 severe weather events were recorded in Marlboro 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 Marlboro 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 EstimatesMarlboro County, South Carolina holds 12,077 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 63.0% of the occupied homes in Marlboro County, South Carolina (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesRules and Standards Behind Heat Pump Installation in Marlboro County, South Carolina1 sourced rules and standards
Licensing and Legal Requirements in Marlboro 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 Marlboro County
Weather puts a load on heating and cooling equipment, and that load shapes what a heat pump has to do year after year. Sizing and installing for Marlboro County means accounting for what the local climate actually demands.
83 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.