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Sizing central AC for a home here starts with what the system will actually run against, not just square footage. 163 severe weather events were recorded in Harrison County, Texas between 2015 and 2024. At that rate, severe weather is a routine part of every system's working life in this county, and a contractor who ignores that when selecting equipment or specifying installation details is leaving the homeowner with a unit built for quieter conditions. Duct sealing, refrigerant line protection, and unit placement all bear on how long a system holds up when the climate pushes it hard on a regular basis.
Ductwork laid down for an older system carries assumptions about static pressure, return air volume, and load distribution that a new central AC unit does not share. Half the homes in Harrison County, Texas were built in 1984 or earlier (2020-2024 ACS 5-year). A contractor sizing and installing a new system in stock like this opens duct runs before pricing the job, because what those runs can move determines which equipment fits and what else has to change. The electrical service gets the same check: a panel wired for what was standard decades back may not carry the draw a modern condenser puts on it. The duct condition and the panel capacity are what drive the scope here, and both have to be confirmed on site.
What a Central AC System Includes
The indoor air handler sits inside the house, most often in a utility closet, attic, or basement, and it holds the evaporator coil that pulls heat out of the indoor air. The outdoor condenser unit sits on a pad beside the house and carries the compressor, which is the engine of the whole system.
A refrigerant line set runs between the two units, carrying refrigerant back and forth through insulated copper tubing. A thermostat mounted on an interior wall ties everything together, 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 the components come together in your specific home.
Get matched in Harrison CountyHarrison County, by the numbers
163 severe weather events were recorded in Harrison 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 Harrison County, Texas were built in 1984 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesHarrison County, Texas holds 29,756 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 76.9% of the occupied homes in Harrison County, Texas (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesRules & Standards Behind Central AC Installation in Harrison County, Texas9 sourced rules and standards
What happens on installation day in Harrison County
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 Harrison 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 History in Harrison County
Harrison County's climate puts real stress on cooling equipment, and that stress compounds over years of hard seasons. Central AC sized and installed for local conditions holds up better than equipment spec'd to a generic standard.
163 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.