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Sizing a central AC system for a Castro County home means accounting for a climate that puts real, repeated stress on equipment. 137 severe weather events were recorded in Castro County, Texas between 2015 and 2024. At that rate, severe weather is a standing condition in this area, and a contractor who ignores it when calculating load capacity will undersize the equipment for what it actually has to run against. Duct routing, unit placement, and equipment ratings all get decided with that load in mind.
Ductwork laid in for an older system carries assumptions about airflow, return paths, and load distribution that a modern central AC unit does not share. Half the homes in Castro County, Texas were built in 1966 or earlier (2020-2024 ACS 5-year). A contractor pricing an installation has to assess whether existing duct runs can move the volume a new system pushes, and where they cannot, the scope changes before the equipment is ever ordered. The electrical service gets the same look: a panel sized for the draw of older equipment may need upgrading before a new unit can run on it. The unit itself is straightforward to specify once those answers are in.
What a Central AC System Includes
The outdoor condenser unit sits outside the house, usually along a side or rear wall, and holds the compressor and condenser coil. Inside, the air handler or furnace cabinet stands in a utility closet, basement, or attic and moves air across the evaporator coil, which pulls heat out of the air before sending it through the ducts.
The refrigerant line set runs between the two units, carrying refrigerant back and forth through copper tubing. A thermostat on an interior wall ties the whole system together, reading the indoor temperature and telling the equipment when to run.
The drawing beside this text shows how those pieces relate in a typical layout, and a licensed contractor determines exactly what the configuration looks like in your home.
Get matched in Castro CountyCastro County, by the numbers
137 severe weather events were recorded in Castro 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 Castro County, Texas were built in 1966 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCastro County, Texas holds 3,024 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 63.6% of the occupied homes in Castro 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 Castro 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 Castro 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.
Severe Weather in Castro County
Weather puts load on HVAC equipment, and what Castro County sees shapes what the hardware here has to handle. A system sized and installed for local conditions lasts longer and works harder when the weather turns.
137 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.