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Sizing a central AC system for this house is not a catalog exercise. The compressor, the condenser fan, and the contactor all accumulate wear across every start-stop cycle, and a system that was undersized at installation runs harder than it should from day one. Homes in Douglas County, KS run cooling about four months a year, from June through September. A contractor quoting a replacement here works out the actual load the house puts on the equipment before settling on a unit, because an undersized system does not get to hide its shortfall in idle months. The condenser coil and contactor take the full weight of that season without relief.
Ductwork sized and routed for older equipment is what a contractor opening walls in much of Douglas County actually finds. Half the homes in Douglas County, Kansas were built in 1988 or earlier (2020-2024 ACS 5-year). That history means the ducts were laid out around something that is no longer in the house, and what a new central AC unit needs to push air through a home efficiently is a different set of pressures and volumes. A contractor quoting the job has to walk the existing trunk lines before the equipment conversation starts. The electrical service gets the same look, since a modern unit draws what the original panel may not have been sized to handle. The unit itself gets specified after that.
What a Central AC System Includes
The outdoor condenser unit sits outside the house, usually on a concrete pad at ground level, and holds the compressor and condenser coil. Inside, the air handler or furnace-mounted evaporator coil sits in a utility space, basement, or closet, and is where the system pulls heat out of the air moving through your home.
The refrigerant line set runs between the two units, connecting the outdoor and indoor sides through an exterior wall. A thermostat mounts on an interior wall and gives the homeowner control over when the system runs and what temperature it holds.
The drawing beside this text shows the general layout of these components, and a licensed contractor determines exactly how the system comes together in your house.
Get matched in Douglas CountyDouglas County, Kansas, by the numbers
208 severe weather events were recorded in Douglas County, Kansas 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 Douglas County, Kansas were built in 1988 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesDouglas County, Kansas holds 53,675 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 50.1% of the occupied homes in Douglas County, Kansas (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesRules & Standards for Central AC Installation in Douglas County, Kansas8 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.
Severe Weather in Douglas County
Outdoor conditions drive how hard cooling equipment has to work, and how often. A system sized and installed for what Douglas County actually experiences holds up differently than one spec'd for somewhere else.
208 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.