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Sizing a central AC system in Lexington County is not a generic calculation a contractor can pull from a national chart. Homes in Lexington County, SC run cooling about five months a year, from May through September. The compressor and condenser fan carry real accumulated runtime each year, and a unit that is undersized for the house does not fail on the first hot day. It runs short of capacity, cycles harder than it should, and the contactor wears faster than it would in a shorter season. A contractor who quotes without a proper load calculation is setting the homeowner up for a compressor replacement before the equipment has earned it.
Existing ductwork shapes every central AC installation in ways that the equipment selection does not. Half the homes in Lexington County, South Carolina were built in 1993 or earlier (2020-2024 ACS 5-year). A house built to that point was ducted for whatever was running then, and a modern system's airflow demands are not the same. A contractor will check whether the supply and return runs can carry the load before anything else gets priced, because undersized or poorly routed ductwork produces an uncomfortable house regardless of what unit sits at the end of it. The electrical service gets the same look. Matching the equipment to what is actually in the walls is where the job is decided.
What Gets Installed With a New Central AC
The outdoor condenser unit sits outside the house, usually on a concrete pad beside the foundation, and holds the compressor and condenser coil. Inside, the air handler or furnace-coil combination occupies a closet, utility room, or attic space and contains the evaporator coil that the refrigerant lines connect to.
A refrigerant line set runs between the two units, typically along an exterior wall or through a small penetration in the structure. The thermostat mounts on an interior wall and gives the homeowner control over the whole system, while a condensate drain line carries moisture away from the evaporator coil to a floor drain or outdoors.
The drawing shows a standard layout, and a licensed contractor determines exactly how each piece is positioned and connected in your home.
Get matched in Lexington CountyLexington County, by the numbers
434 severe weather events were recorded in Lexington 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 Lexington County, South Carolina were built in 1993 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesLexington County, South Carolina holds 132,916 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 77.4% of the occupied homes in Lexington 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 Lexington 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 Lexington 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 Lexington County
The local climate puts real demands on cooling equipment, and those demands shape what a properly sized and installed system needs to handle. How hard a unit works over its life is a local question, and the weather record for this area is part of the answer.
434 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.