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Sizing a central AC system in Lee County is not a generic exercise. Homes in Lee County, SC run cooling about five months a year, from May through September. The compressor starts and stops across those months, and so does the condenser fan and the contactor that switches it. An undersized unit runs longer cycles trying to meet a load it cannot clear, and that strain accumulates on parts that have no off-season to recover in. A contractor quoting a replacement works out the actual load on the house before settling on equipment, because a box that is too small for this house will fail on its own schedule regardless of brand.
Existing ductwork is what a contractor has to size a new system against, and in a county where the older half of the housing stock was built for equipment generations removed from what gets installed today, the ducts a house already has are where an installation quote either holds or falls apart. Half the homes in Lee County, South Carolina were built in 1983 or earlier (2020-2024 ACS 5-year). That gap between what the house was ducted for and what a new central AC unit actually needs is what a contractor opens walls and pulls measurements to answer before anything else is ordered. Electrical service follows the same logic: a panel that was adequate when the house went up may not carry the load a modern unit draws.
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, the two components that do the heaviest work. Inside, the air handler mounts in a utility closet, attic, or basement and contains the evaporator coil along with the blower that moves conditioned air through the home.
The refrigerant lines run between the outdoor unit and the air handler, connecting the two halves of the system through the wall or floor. A thermostat goes on an interior wall and gives the homeowner control over when the system runs.
The drawing shows a typical central AC layout, and a licensed contractor determines exactly how each piece is configured for this house.
Get matched in Lee CountyLee County, SC, by the numbers
66 severe weather events were recorded in Lee 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 Lee County, South Carolina were built in 1983 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesLee County, South Carolina holds 7,602 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 70.5% of the occupied homes in Lee 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 Lee 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 Lee 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 Lee County
Storm activity puts real hours on HVAC equipment. How much strain the climate places on a system here in Lee County shapes what a contractor installs and how they size it.
66 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.