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Sizing a central AC system for a home here starts with what this area actually puts equipment through. 140 severe weather events were recorded in Coleman County, Texas between 2015 and 2024. At that rate, severe weather is part of the normal operating environment, and a contractor who ignores that when selecting and positioning equipment leaves the homeowner with a system built for somewhere easier. Duct routing, unit placement, and equipment ratings all get weighed against what the climate here demands, not against a generic regional spec.
Ductwork laid down for earlier systems was sized for what those systems moved, and a new central AC unit draws on it differently. Half the homes in Coleman County, Texas were built in 1966 or earlier (2020-2024 ACS 5-year). A contractor installing a new system here has to evaluate whether the existing duct network can carry the load the new equipment puts through it, and that assessment drives the scope before any other part of the job does. Where the ducts fall short, the electrical is the next question. Both variables are in the house before the contractor arrives.
What a Central AC System Includes
The outdoor condenser unit sits on a concrete pad outside the house and holds the compressor and condenser coil, the two components that do the heaviest work in the system. Inside, the air handler or furnace cabinet stands in a utility closet, basement, or attic and houses the evaporator coil along with the blower that moves air through the home.
The refrigerant line set runs between those two units, connecting the indoor and outdoor sides through the wall or floor. A thermostat mounts on an interior wall and gives the homeowner control over when the system runs and at what temperature.
The drawing shows a typical layout, and a licensed contractor determines exactly what applies to your house.
Get matched in Coleman CountyColeman County, by the numbers
140 severe weather events were recorded in Coleman 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 Coleman County, Texas were built in 1966 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesColeman County, Texas holds 4,899 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 77.2% of the occupied homes in Coleman County, Texas (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Governing Central AC Installation in Coleman 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 HVAC Work in Coleman 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 Coleman County
Weather puts a load on cooling equipment, and that load is not the same everywhere. What the sky does in Coleman County over time shapes how hard a system has to work and how it should be sized and installed.
140 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.