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Sizing a central AC unit in Atascosa County starts with what the climate actually demands, not with a catalog default. 39 severe weather events were recorded in Atascosa County, Texas between 2015 and 2024. At that rate, severe weather is a real but occasional part of life here, not a constant grind on equipment. A contractor quoting a new installation accounts for summer heat loads and the site conditions of the specific home. Poor duct layout, undersized equipment, or a rushed refrigerant charge will cause problems well before weather does.
Ductwork sized for an older generation of equipment is what a contractor finds in a large share of homes here, and whether it can carry a modern central AC system is the question that determines the real scope of the job. Half the homes in Atascosa County, Texas were built in 1993 or earlier (2020-2024 ACS 5-year). A house that old was ducted for equipment with different airflow requirements, which means a contractor has to assess what is already in the walls and attic before the new unit can be quoted accurately. The electrical service runs into the same question. What the house already contains either fits a modern system or it does not, and that answer comes from measuring, not from the year on the permit.
What Gets Installed With a New Central AC
The outdoor condenser unit sits on a pad outside 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 closet, attic, or utility space and contains the evaporator coil and the blower that moves air through the house.
The thermostat goes on an interior wall where it reads the air temperature and tells the system when to run. A copper refrigerant line set runs between the outdoor and indoor units, and a condensate drain line carries moisture away from the evaporator coil to a floor drain or outdoors.
The drawing shows a typical layout, and a licensed contractor determines exactly what applies to your home.
Get matched in Atascosa CountyAtascosa County, by the numbers
39 severe weather events were recorded in Atascosa 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 Atascosa County, Texas were built in 1993 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesAtascosa County, Texas holds 19,214 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 77.4% of the occupied homes in Atascosa County, Texas (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards for Central AC Installation in Atascosa County, Texas9 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 Rules for Atascosa 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 Atascosa County
Weather puts real demand on cooling equipment, and that demand is local. What the climate does in Atascosa County sets the baseline a central AC system has to meet, which makes installation sizing and equipment selection a decision rooted in conditions here.
39 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.