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Size a central AC system for Llano County and the weather record is one input among several, but it is not the one that drives the decision. 77 severe weather events were recorded in Llano County, Texas between 2015 and 2024. At that rate, severe weather touches this area with some regularity but does not define every cooling season the way it does in counties that absorb storm after storm. A contractor quoting a new install here will spend more time on the load calculation for the structure, the duct layout, and the quality of the refrigerant lines than on factoring in storm exposure as a primary design constraint. Age, installation quality, and how well the equipment has been maintained are what shape the job.
Ductwork laid in for older equipment carries different static pressure assumptions than a modern central AC system requires, and whether what is already in the walls can handle the new load is the first question a contractor has to answer before anything else on the job can be priced. Half the homes in Llano County, Texas were built in 1990 or earlier (2020-2024 ACS 5-year). That puts a large share of Llano County homes in the range where the existing duct layout, not the unit itself, is what a contractor spends the most time evaluating. Electrical service gets checked too, since load requirements have shifted. But the duct system is where an installation job here most often turns harder or simpler than the initial walkthrough suggested.
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 the evaporator coil housed inside it. The outdoor condenser unit sits on a concrete pad beside the house and holds the compressor and condenser coil. These two units are the core of what a contractor installs.
A refrigerant line set runs between the indoor and outdoor units, carrying refrigerant back and forth through copper tubing. The thermostat mounts on an interior wall and gives the homeowner control over when the system runs and what temperature it holds.
The drawing shows a typical layout, and a licensed contractor determines what fits the specifics of your house.
Get matched in Llano CountyLlano County, by the numbers
77 severe weather events were recorded in Llano 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 Llano County, Texas were built in 1990 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesLlano County, Texas holds 15,788 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 76.5% of the occupied homes in Llano County, Texas (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesRules & Standards Behind HVAC Installation in Llano 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 Llano 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 in Llano County
Weather puts direct demands on cooling equipment: how hard it runs, how long seasons last, and how quickly systems wear. A contractor sizing and installing central AC in Llano County needs to account for local conditions, not generic ones.
77 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.