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Sizing central AC in Waller County means accounting for what the equipment will run against, not just what the catalog says fits the square footage. 33 severe weather events were recorded in Waller County, Texas between 2015 and 2024. At that rate, severe weather is a standing feature of the local climate, and a system sized to bare-minimum specs will be undersized in practice. A contractor working here factors that load into equipment selection and duct design before the first component is ordered.
Existing ductwork is what a contractor has to price before the new unit ever matters. Half the homes in Waller County, Texas were built in 1998 or earlier (2020-2024 ACS 5-year). Houses built in that era were ducted for equipment with different airflow requirements than what gets installed today, and what looked like adequate trunk sizing then can restrict a modern system enough to hurt performance. The electrical is a separate check, but ductwork is where the real unknowns live in a house of that vintage.
What Central AC Puts in Your Home
The outdoor condenser unit sits on a concrete pad beside the house and holds the compressor and condenser coil. Inside, the air handler or furnace cabinet mounts in a utility space, basement, or attic and carries the evaporator coil that conditions the air before it moves through the house.
The thermostat goes on a main living area wall and gives the homeowner control over the whole system. A refrigerant line set runs between the outdoor and indoor units, and a condensate drain line carries moisture away from the evaporator coil to a floor drain or outside.
The drawing shows a typical layout, and a licensed contractor determines exactly what fits and where in your home.
Get matched in Waller CountyWaller County, by the numbers
33 severe weather events were recorded in Waller 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 Waller County, Texas were built in 1998 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesWaller County, Texas holds 20,345 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 72.0% of the occupied homes in Waller 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 Waller County, Texas9 sourced rules and standards
What the installation looks like in practice
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 Waller 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 Events in Waller County
Weather puts a measurable load on HVAC equipment, and that load varies by location. What happens in Waller County shapes how hard a system has to work and how well it needs to be sized, which makes local weather data a practical input for any installation decision.
33 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.