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A contractor quoting a central AC installation in Karnes County has to size the system around what the house actually demands, not around a picture of relentless storm punishment. 20 severe weather events were recorded in Karnes County, Texas between 2015 and 2024. At that rate, severe weather is an occasional event rather than a grinding seasonal condition, so a unit that has struggled or failed here was almost certainly working against poor original sizing, deferred maintenance, or age. Those are the variables a contractor establishes before they spec replacement equipment, because getting the load calculation right in a county like this is a local question shaped by the building, not by the weather record.
Ductwork laid down for an earlier generation of equipment is the first thing a contractor opens, measures, and prices around on a central AC installation here. Half the homes in Karnes County, Texas were built in 1988 or earlier (2020-2024 ACS 5-year). A system sized for today's efficiency standards draws and distributes air differently than what those ducts were designed to handle, so the runs, the returns, and the connections all get checked before the unit itself is quoted. The electrical panel follows the same logic. What the house already contains sets the real scope of the job.
What Central AC Puts in Your Home
The outdoor condenser unit sits outside the house, usually on a concrete pad along an exterior wall, and holds the compressor and the condenser coil. Inside, the air handler or furnace-mounted evaporator coil takes up space in a utility room, basement, or attic, and is where the system pulls heat out of your indoor air.
The refrigerant line set runs between those two units, connecting the indoor coil to the outdoor unit through a pair of insulated copper lines. A thermostat goes on an interior wall and gives you the single point of control for the whole system.
The drawing shows a typical layout, and a licensed contractor determines what fits the configuration of your specific home.
Get matched in Karnes CountyKarnes County, by the numbers
20 severe weather events were recorded in Karnes 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 Karnes County, Texas were built in 1988 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesKarnes County, Texas holds 5,975 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 62.4% of the occupied homes in Karnes 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 Karnes 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 Karnes 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.