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Sizing a central AC system for this house means sizing it for what the compressor is actually asked to do. Homes in Montgomery County, KS run cooling about four months a year, from June through September. A compressor that starts and stops across that span builds heat and mechanical wear on every cycle, and one that was undersized at installation works harder than it should through every one of those starts. A contractor quoting a new system here needs a load calculation tied to the house itself, because an undersized unit does not coast through a compressed season. It runs short of where it should be, and the compressor pays for it.
Ductwork laid down for one system does not automatically carry another. Half the homes in Montgomery County, Kansas were built in 1958 or earlier (2020-2024 ACS 5-year). A house that old was ducted for whatever was running at the time, and what a contractor finds when they get into the trunk lines decides whether those runs can deliver what a new central AC unit demands or whether sections need to go. The electrical question follows the same logic: service panels in houses of that vintage were sized for a smaller draw, and a new unit's requirements land on infrastructure that was never spec'd for it.
What a Central AC Installation Covers, Piece by Piece
The outdoor condenser unit sits on a concrete pad beside the house and holds the compressor and condenser coil, the two components that do the heaviest work in the system. Inside, the air handler or furnace-mounted evaporator coil lives in a utility space, basement, or closet and is the indoor half of that pair.
The refrigerant line set runs between those two units through a small penetration in the wall, carrying the working fluid back and forth. The thermostat goes on a main living-area wall and is the control point a homeowner touches to set temperatures and run schedules.
The drawing shows a typical layout, and a licensed contractor determines exactly what applies to this house.
Get matched in Montgomery CountyMontgomery County, Kansas, by the numbers
174 severe weather events were recorded in Montgomery 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 Montgomery County, Kansas were built in 1958 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesMontgomery County, Kansas holds 15,538 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 72.9% of the occupied homes in Montgomery County, Kansas (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Governing Central AC Installation in Montgomery County, Kansas8 sourced rules and standards
What the installation looks like in Montgomery 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.
Severe Weather Events in Montgomery County
Extreme weather puts direct strain on cooling equipment, shortening service life and pushing systems past their rated capacity. How hard a central AC unit has to work is a local question, and the answer starts with what the climate here actually does.
174 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.