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The compressor in a central AC unit starts and stops every time the house calls for cooling, and in Union County those start cycles stack up across a long run of consecutive warm months. Homes in Union County, SC run cooling about five months a year, from May through September. By the time a compressor fails, the contactor and the condenser fan motor have logged the same hours. A contractor diagnosing a breakdown here works through those high-cycle components before pricing anything else, because the wear pattern points there first.
Ductwork in much of this county was routed and sealed for systems that have since been replaced at least once, sometimes more. Half the homes in Union County, South Carolina were built in 1972 or earlier (2020-2024 ACS 5-year). A contractor opening a unit here finds components that have spent years working against whatever was already in the walls, and the repair scope shifts depending on whether the part that failed is still manufactured. A refrigerant valve or a control board for a system of that vintage can mean a parts search, not a shelf pull, and that changes what the repair costs and how long it takes.
The Parts of a Central AC a Contractor Checks First
The outdoor condenser unit sits outside the house, usually on a concrete pad beside the foundation, and it holds the compressor and condenser coil. These are the pieces a contractor goes to first when a system stops cooling. A failed compressor, a refrigerant leak at the coil, or a burned capacitor all show up here.
Inside the house, the air handler or furnace cabinet holds the evaporator coil and the blower. The evaporator coil is where refrigerant does its work on the indoor air, and a frozen coil or a blocked blower are common reasons a system runs but delivers no relief. The refrigerant lines connecting the two units and the thermostat on the wall round out what a contractor checks.
The drawing shows a typical layout, and a licensed contractor determines which components apply and what condition they are in for your specific house.
Get matched in Union CountyUnion County by the Numbers
73 severe weather events were recorded in Union 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 Union County, South Carolina were built in 1972 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesUnion County, South Carolina holds 13,527 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 71.3% of the occupied homes in Union 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 Union County, South Carolina9 sourced rules and standards
What Happens When the Contractor Shows Up
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 Rules for Union 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 Union County
Weather puts hours on HVAC equipment. Every storm cycle that runs a system hard is one more reason a repair call happens sooner rather than later, and what that looks like in Union County shapes the workload local contractors deal with.
73 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.