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Sizing a central AC system for Oldham County starts with what the climate actually demands. 187 severe weather events were recorded in Oldham County, Texas between 2015 and 2024. At that rate, severe weather is a standing feature of the operating environment, and a contractor who ignores it will undersize the equipment or specify components that wear faster than they should. A unit built to catalog assumptions runs hard to keep up, and the strain shows up early in its service life. A licensed contractor accounts for this before settling on equipment, not after.
Ductwork laid down for one era of equipment does not automatically carry what a current central AC system pushes through it. Half the homes in Oldham County, Texas were built in 1967 or earlier (2020-2024 ACS 5-year). A contractor pricing an installation here has to assess what is already in the walls and attic before the equipment itself becomes the conversation, because ducts sized and sealed for an older system can undercut a new unit's performance regardless of how well the unit itself is specified. The electrical service is a separate question, and it gets answered at the same time. What the house already contains sets the scope.
What a Central AC System Includes
The indoor air handler sits inside the house, usually in a utility closet, attic, or dedicated mechanical space, and it pulls warm air from the rooms, passes it across the evaporator coil, and pushes the cooled air back through the supply registers. The outdoor condenser unit sits on a concrete pad beside the house and holds the compressor and condenser coil, which together shed the heat that was pulled from inside.
The refrigerant line set runs between those two units, carrying refrigerant back and forth through a pair of insulated copper lines that pass through the wall or floor. The thermostat mounts on an interior wall and serves as the control point, reading the indoor temperature and telling the system when to run.
The drawing shows the general layout of a central AC system, and a licensed contractor determines exactly how each piece fits the conditions of your specific home.
Get matched in Oldham CountyOldham County, by the numbers
187 severe weather events were recorded in Oldham 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 Oldham County, Texas were built in 1967 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOldham County, Texas holds 776 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 73.6% of the occupied homes in Oldham 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 Oldham 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 Oldham 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 Oldham County
Weather puts a load on HVAC equipment, and that load varies by where you live. A system sized and installed for local conditions handles the work that this county's climate actually delivers.
187 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.