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The compressor in a central AC unit in Charleston County has been starting and stopping through a long stretch of heat every year it has run. Homes in Charleston County, SC run cooling about five months a year, from May through September. Contactors, condenser fan motors, and capacitors carry that cycling load season after season, and those are the parts a contractor checks first on a repair call here. A system that was undersized or poorly charged at installation shows that wear sooner, because there is no long idle period to mask it.
Half the homes in Charleston County, South Carolina were built in 1991 or earlier (2020-2024 ACS 5-year). That figure matters to repair work in a specific way. A system sitting in a house built around that period is not ancient machinery running on discontinued components. When a contractor opens the unit, the parts it needs are still catalogued, still available, and the diagnostic question is what actually failed, not whether a replacement exists for it.
The Parts of a Central AC a Contractor Checks First
The outdoor condenser unit sits on a pad beside the house and is where a contractor starts when something goes wrong. The cabinet holds the compressor and the condenser coil, and either one failing will stop the system cold. A refrigerant leak, a seized compressor, or a failed capacitor all show up here first.
Inside the house, the air handler or furnace cabinet holds the evaporator coil and the blower motor. The evaporator coil is a common trouble spot, collecting ice when refrigerant is low or airflow is blocked. The blower motor, the contactor, and the thermostat round out the pieces a contractor works through before a diagnosis is confirmed.
The drawing shows a typical layout, and a licensed contractor determines which components apply to the specific system in your house.
Get matched in Charleston CountyCharleston County by the Numbers
436 severe weather events were recorded in Charleston 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 Charleston County, South Carolina were built in 1991 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCharleston County, South Carolina holds 209,803 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 63.9% of the occupied homes in Charleston County, South Carolina (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Governing Central AC Repair in Charleston County, South Carolina9 sourced rules and standards
What the Repair Work 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 Charleston 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 Charleston County
Storm activity puts direct strain on cooling equipment: power fluctuations, debris, and heat spikes all accelerate wear on components that were already working hard. How much of that pressure a system faces depends on where it sits, which makes local weather history a real factor in repair frequency.
436 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.