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Sizing central AC for a home in Durham County starts with what the climate actually asks of a system year after year. 143 severe weather events were recorded in Durham County, North Carolina between 2015 and 2024. At that rate, severe weather is a standing feature of the operating environment, and a contractor who ignores it when selecting equipment or specifying installation details is underpricing the work. Duct sealing, refrigerant line protection, and unit placement all carry more consequence here than they would somewhere the weather seldom stresses the system. A proper install accounts for that load before the first breaker is thrown.
Ductwork sized and routed for an older system does not automatically carry a new one well, and in Durham County's housing stock that is the question a contractor has to answer before anything else on a central AC installation. Half the homes in Durham County, North Carolina were built in 1993 or earlier (2020-2024 ACS 5-year). A house built in that period was designed around equipment with different airflow demands than current units carry, which means the existing duct layout gets measured and assessed before the new system is priced. Electrical service gets the same look. The unit itself comes last.
What Gets Installed With a New Central AC
The outdoor condenser unit sits outside the house, usually on a pad at ground level beside the foundation, and holds the compressor and condenser coil. Inside, the air handler or furnace cabinet stands in a utility closet, basement, or attic and contains the evaporator coil along with the blower that moves air through the home.
A refrigerant line set runs between the two units, carrying refrigerant back and forth through insulated copper tubing that passes through the wall. A thermostat mounts on an interior wall and serves as the control point, telling the system when to run and when to stop.
The drawing shows the general layout of these components, and a licensed contractor determines exactly how each one is configured and positioned in your specific house.
Find a contractor in Durham CountyDurham County, by the numbers
143 severe weather events were recorded in Durham County, North 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 Durham County, North Carolina were built in 1993 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesDurham County, North Carolina holds 153,022 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 55.5% of the occupied homes in Durham County, North Carolina (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCode & Licensing Record for Central AC Installation in Durham County, North Carolina10 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 Durham County, North Carolina
North Carolina issues Class I heating licenses covering all systems in all structures, and Class II licenses covering heating systems in single-family detached residential dwellings.
North Carolina requires a license before any person or firm may engage in, or offer to engage in, the business of heating contracting.
Severe Weather Events in Durham County
Local weather puts real demands on cooling equipment, and those demands shape what a properly installed system needs to handle. Sizing and installation decisions for central AC are tied to conditions on the ground here, not to a regional average.
143 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.