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Sizing a central AC system for a home in Union County starts with what the house demands of the equipment, not with the area's weather record. 60 severe weather events were recorded in Union County, Georgia between 2015 and 2024. At that rate, severe weather lands here as an event, not a steady operating pressure, which means a contractor quoting or installing a system is working out duct layout, load calculations, and equipment capacity against the structure and the local climate's cooling demands. Age of the existing equipment and quality of the original install are what drive most replacement decisions here.
Ductwork laid for an older system carries assumptions about airflow, routing, and load that a new central AC unit does not share. Half the homes in Union County, Georgia were built in 1995 or earlier (2020-2024 ACS 5-year). That gap between what the house was built around and what a contractor is now setting in place is where installation jobs get complicated or straightforward. A contractor sizing new equipment has to check whether the existing duct runs can move the right volume of air before the unit is ever ordered, because ducts that cannot handle the load turn a clean install into a retrofit.
What Gets Installed With a New Central AC
The outdoor condenser unit sits on a pad beside the house and holds the compressor and condenser coil, the two components doing the heaviest work in the system. Inside, the air handler mounts in a utility closet, basement, or attic and contains the evaporator coil and the blower that pulls air through the system.
A metering device, usually an expansion valve, connects the indoor and outdoor sides and controls how refrigerant moves between the coils. The thermostat goes on an interior wall and is the control point the homeowner touches directly, telling the system when to run.
The drawing beside this text shows a typical layout, and a licensed contractor determines exactly what the installation requires in your house.
Get matched in Union CountyUnion County, Georgia, by the numbers
60 severe weather events were recorded in Union County, Georgia 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, Georgia were built in 1995 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesUnion County, Georgia holds 15,164 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 84.4% of the occupied homes in Union County, Georgia (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesRules & Standards Behind Central AC Installation in Union County, Georgia8 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.
Severe Weather Events in Union County
Storms and extreme heat place real demand on cooling equipment, shortening run cycles and pushing systems harder than mild climates do. A central AC installation sized and built for local conditions holds up differently than one that was not.
60 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.