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A contractor quoting central AC in McLennan County cannot treat equipment sizing as a catalog exercise. 174 severe weather events were recorded in McLennan County, Texas between 2015 and 2024. At that rate, severe weather is part of what every system here runs against season after season, and a unit sized for mild conditions will be undersized for the real ones. The contractor has to match the equipment to what the climate actually demands, which means load calculations specific to this area, not defaults pulled from a national standard.
Ductwork laid down for one generation of equipment rarely moves air the way a new central AC system needs it to. Half the homes in McLennan County, Texas were built in 1983 or earlier (2020-2024 ACS 5-year). That age of construction predates the load calculations and duct sizing standards that modern central AC is designed around, so what a contractor finds behind the walls and in the ceiling often has to be evaluated, rerouted, or replaced before a new unit can do its job. The electrical service gets the same look: what the house was wired to handle and what a new system draws are questions a contractor answers by opening the panel, not by reading 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 it holds the evaporator coil that pulls heat out of the air moving through your home. The outdoor condenser unit sits on a concrete pad beside the house and carries the compressor and condenser coil, which are the two pieces that shed that heat outside.
A refrigerant line set runs between the indoor and outdoor units, carrying refrigerant back and forth through copper tubing insulated against the Texas heat. A thermostat on an interior wall ties the whole system together, reading the temperature in the home and telling the system when to run.
The drawing shows a typical layout, and a licensed contractor determines exactly what fits and where in your specific home.
Get matched in McLennan CountyMcLennan County, by the numbers
174 severe weather events were recorded in McLennan 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 McLennan County, Texas were built in 1983 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesMcLennan County, Texas holds 108,454 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 61.8% of the occupied homes in McLennan County, Texas (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesRules & Standards Governing Central AC Installation in McLennan County, Texas9 sourced rules and standards
What happens during an HVAC installation in McLennan County
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 McLennan 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 McLennan County
Extreme weather puts a measurable load on cooling equipment, and that load varies by location. How hard the climate pushes here shapes what a correctly sized, properly installed central AC system needs to handle.
174 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.