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Sizing central AC in Cobb County starts with what the climate actually demands of a system, not what a catalog default suggests. 105 severe weather events were recorded in Cobb County, Georgia between 2015 and 2024. At that rate, severe weather is part of the normal operating life of equipment here, which means a contractor has to account for it when choosing unit capacity, specifying components, and planning where and how the equipment sits. A unit installed without that accounting gets undersized, overworked, or positioned in a way that shortens what it can do.
Ductwork designed for a different era of equipment is what a contractor runs into across much of Cobb County. Half the homes in Cobb County, Georgia were built in 1990 or earlier (2020-2024 ACS 5-year). Trunks and branch lines put in decades before current systems existed were laid out for different load calculations, different static pressure, different everything. A new central AC unit can be quoted in an afternoon, but whether the existing duct system will carry it without leaking, restricting, or starving certain rooms is what the contractor has to verify before that quote means much. The electrical service raises its own questions, since panel capacity for modern equipment has to be confirmed against what is actually in the house.
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 in the system. Inside, the air handler mounts in a utility closet, attic, or basement and houses the evaporator coil and blower that move conditioned air through the home.
The thermostat goes on an interior wall where it reads the temperature of the living space and tells the system when to run. A condensate drain line runs from the air handler to a floor drain or outside, carrying away the moisture the evaporator coil pulls from the air.
The drawing shows a representative layout, and a licensed contractor determines exactly what applies to your house.
Get matched in Cobb CountyCobb County by the numbers
105 severe weather events were recorded in Cobb 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 Cobb County, Georgia were built in 1990 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCobb County, Georgia holds 314,104 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 67.0% of the occupied homes in Cobb County, Georgia (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesRules and Standards Behind Central AC Installation in Cobb 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 Cobb County
Georgia's climate puts real stress on cooling equipment, and Cobb County gets its share of weather that forces systems to work harder and recover faster. How often that happens locally shapes what a central AC installation here needs to handle.
105 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.