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A contractor quoting a central AC install in Galveston County has to account for what the equipment will actually run against, not just the square footage of the house. 94 severe weather events were recorded in Galveston County, Texas between 2015 and 2024. At that rate, severe weather is a standing condition of operating here, and a system sized without accounting for that load will be undersized in practice even if it meets the spec on paper. Duct layout, equipment capacity, and refrigerant charge all want to be calculated for this climate specifically.
Ductwork sized and routed for an older generation of equipment carries assumptions a modern central AC system was not designed around. Half the homes in Galveston County, Texas were built in 1990 or earlier (2020-2024 ACS 5-year). That gap between what the house was built with and what a contractor is fitting now is where most of the real complexity in an installation lives. Before any equipment is ordered, a contractor has to assess whether the existing duct layout can handle the airflow a current system delivers, and whether the electrical service will carry the load. If either falls short, the scope of the job changes.
What a Central AC System Includes
The outdoor condenser unit sits outside the house, usually along a side wall or at the back, and it holds the compressor and the condenser coil. Inside, the air handler or furnace sits in a utility closet, basement, or attic and moves air across the evaporator coil, which is the part that pulls heat out of the air in your living space.
The thermostat mounts on an interior wall and is the control point for the whole system. A refrigerant line set runs between the indoor and outdoor units, and a condensate drain line carries moisture away from the evaporator coil to a floor drain or outside.
The drawing shows a typical layout, and a licensed contractor determines exactly what applies to your house.
Get matched in Galveston CountyGalveston County, by the numbers
94 severe weather events were recorded in Galveston County, Texas 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 Galveston County, Texas were built in 1990 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesGalveston County, Texas holds 161,868 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 67.6% of the occupied homes in Galveston County, Texas (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesRules & Standards Behind Central AC Installation in Galveston County, Texas9 sourced rules and standards
What happens on installation day
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 Galveston County, Texas
In Texas a person may not engage in air conditioning and refrigeration contracting unless that person holds a license issued under the state air conditioning and refrigeration contractor law.
Severe Weather Events in Galveston County
Gulf Coast weather puts sustained pressure on cooling equipment that inland climates rarely match. How hard a system has to work, and how long it holds up, is shaped by local conditions, which is why weather history belongs on a page about what to install and how to size it.
94 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.