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A contractor quoting central AC installation in DeWitt County has to work out what the house actually demands before settling on equipment size, and storm history is a smaller part of that calculation than it might be elsewhere in Texas. 22 severe weather events were recorded in DeWitt County, Texas between 2015 and 2024. At that rate, severe weather lands occasionally rather than as a standing operating condition, which means a sizing decision turns on the home's square footage, insulation, and existing duct layout far more than on weather resilience. A unit chosen to fit the house and installed with attention to airflow will carry the load here without being over-engineered for conditions that rarely arrive.
Ductwork sized and routed for earlier equipment is what a contractor has to evaluate before anything else can be priced. Half the homes in DeWitt County, Texas were built in 1978 or earlier (2020-2024 ACS 5-year). That gap between when a house was built and what a new central AC system draws is where installations either hold to the original scope or grow into reconfigurations. Electrical service in a house of this vintage may or may not support a modern unit's demand, and the answer comes from what is actually in the panel, not from the permit date.
What a Central AC System Includes
The indoor air handler sits inside the house, usually in a utility closet, attic, or basement, and pulls warm air across a cold coil before pushing it back through the vents. The outdoor condenser unit sits on a concrete pad beside the house and sheds the heat that was pulled from inside.
A refrigerant line set runs between those two units, carrying the working fluid that moves heat from one side to the other. A thermostat on the wall ties the whole system together, reading the air temperature in the home and telling the equipment when to run.
The drawing shows a typical layout, and a licensed contractor determines what the setup looks like in your specific house.
Get matched in DeWitt CountyDeWitt County, by the numbers
22 severe weather events were recorded in DeWitt 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 DeWitt County, Texas were built in 1978 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesDeWitt County, Texas holds 9,238 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 73.9% of the occupied homes in DeWitt 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 DeWitt 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.
What DeWitt County, Texas Requires for HVAC Installation
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.