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A contractor quoting a central AC installation in Erath County cannot size the system off a spec sheet alone. 86 severe weather events were recorded in Erath County, Texas between 2015 and 2024. At that rate, severe weather is a standing part of what equipment here runs against, and a system sized without accounting for it will be undersized for the conditions it actually meets. That affects duct layout, equipment selection, and where a contractor draws the line on what the installation needs to handle long-term.
Ductwork sized and routed for older equipment is what a contractor runs into in a substantial share of Erath County homes. Half the homes in Erath County, Texas were built in 1991 or earlier (2020-2024 ACS 5-year). A system built for smaller cooling loads often left ducts that choke airflow when a modern central unit tries to push through them, and a new unit matched to the house's square footage still underperforms if the distribution cannot carry what it produces. The electrical side gets checked for the same reason: original service panels were sized for what the house drew then, not what a new system draws now. Getting the equipment selection right is straightforward once a contractor knows what the existing ductwork and electrical can handle.
What a Central AC System Is Made Of
The outdoor condenser unit sits on a concrete pad beside the house and holds the compressor and condenser coil, which together shed heat to the outside air. Inside, the air handler or furnace cabinet mounts in a utility space, closet, or attic and holds the evaporator coil that pulls heat out of the air moving through your home.
The refrigerant line set runs between the two units, carrying refrigerant back and forth through insulated copper tubing that passes through a small penetration in the wall or floor. A thermostat mounts on an interior wall and is the control point that tells the system when to run.
The drawing shows the general layout of these components, and a licensed contractor determines exactly how they apply to your house.
Get matched in Erath CountyErath County, by the numbers
86 severe weather events were recorded in Erath 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 Erath County, Texas were built in 1991 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesErath County, Texas holds 18,694 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 63.1% of the occupied homes in Erath 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 Erath 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 and Legal Requirements in Erath 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 Erath County
Weather puts a load on HVAC equipment, and that load is shaped by what the local climate actually does. A central AC system sized and installed for Erath County conditions handles that pressure differently than one built for somewhere else.
86 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.