Tell us about the job
Takes about a minute. No obligation.
Sizing a central AC system for Marlboro County starts with what the compressor is actually being asked to carry. Homes in Marlboro County, SC run cooling about five months a year, from May through September. The contactor closes and opens on every cycle through those months, the condenser fan runs whenever the compressor runs, and a system that was undersized or poorly charged at installation starts accumulating wear immediately rather than over some distant future. A contractor quoting a new install here treats the load calculation as the first decision, because the refrigerant charge, the coil match, and the duct static pressure all follow from it, and errors in any one of them land on the compressor first.
Ductwork laid down for an earlier generation of equipment rarely matches what a new central AC system needs from it. Half the homes in Marlboro County, South Carolina were built in 1977 or earlier (2020-2024 ACS 5-year). A contractor sizing and routing a new system has to assess whether those ducts can actually carry the airflow the new unit delivers, and whether the existing electrical service will handle the load, before the equipment itself is chosen. In stock this old, those two assessments routinely change the scope of the job.
What Gets Installed With a New Central AC
The outdoor condenser unit sits on a concrete pad beside the house and holds the compressor and condenser coil. Inside, the air handler mounts in a utility closet, attic, or basement and contains the evaporator coil and blower that push conditioned air through the home.
The two units connect through a refrigerant line set, a pair of copper tubes that run between the outdoor and indoor equipment. A thermostat mounts on an interior wall and gives the homeowner control over when the system runs.
The drawing shows a typical layout, and a licensed contractor determines what fits the specific conditions of your house.
Get matched in Marlboro CountyMarlboro County, SC, 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 EstimatesCodes & Standards Governing Central AC Installation in Marlboro County, South Carolina9 sourced rules and standards
What the Installation Actually Looks Like
Split-system central air conditioners rated below 45,000 Btu/h manufactured on or after January 1, 2023 must meet a federal minimum of 13.4 SEER2.
Split-system central air conditioners rated at or above 45,000 Btu/h manufactured on or after January 1, 2023 must meet a federal minimum of 13.4 SEER2.
Split-system central air conditioners manufactured between January 1, 2015 and December 31, 2022 had to meet 13 SEER, the metric that preceded SEER2.
Single-package central air conditioners manufactured on or after January 1, 2023 must meet a federal minimum of 13.4 SEER2.
Space-constrained central air conditioners manufactured on or after January 1, 2023 must meet a federal minimum of 11.7 SEER2.
Federal efficiency standards for split-system central air conditioners and heat pumps are set on each certified combination of outdoor unit and indoor coil rather than on the outdoor unit alone.
Residential and light commercial air conditioning and heat pump systems assembled in the field, including mini-splits and unitary systems, may not be installed on or after January 1, 2025 using a refrigerant with a global warming potential above 700.
A field-assembled system whose specified components were all manufactured or imported before January 1, 2025 carries no installation compliance date under the refrigerant restrictions and may still be installed.
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 HVAC equipment, and that load varies by where you live. A system sized and installed for what Marlboro County actually experiences will run more reliably and last longer than one spec'd to a generic standard.
83 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.