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Sizing a central AC system here is not a generic exercise. Homes in Bollinger County, MO run cooling about four months a year, from June through September. The compressor, condenser fan, and contactor carry that full load every year, and a system that is undersized or installed with shortcuts will show wear sooner because the season gives it no slack. A contractor has to run a proper load calculation for the house before quoting, because an undersized unit will short-cycle through the summer and stress its components faster than a correctly sized one would.
Ductwork sized and routed for equipment that is no longer in these houses shapes what a central AC installation actually costs and how long it takes. Half the homes in Bollinger County, Missouri were built in 1982 or earlier (2020-2024 ACS 5-year). A contractor quoting a new system has to assess what those ducts will carry before settling on a unit, because a modern system pushed through undersized or poorly routed runs delivers less than its rated capacity regardless of what is written on the equipment. The electrical service gets the same look, since what the panel was built to handle and what a new unit draws do not always match.
What a Central AC System Includes
The outdoor condenser unit sits on a pad beside the house and holds the compressor and the condenser coil, which together shed the heat pulled from inside. The indoor air handler or furnace-mounted coil lives in a utility space, basement, or closet and is the point where the refrigerant line meets the indoor air supply.
A copper refrigerant line set runs between those two units, carrying refrigerant back and forth through the walls or along the exterior. The thermostat mounts on an interior wall and is the control point that tells the whole system when to run.
The drawing beside this shows the general layout of a central AC system, and a licensed contractor determines exactly what applies to this house.
Get matched in Bollinger CountyBollinger County, by the numbers
104 severe weather events were recorded in Bollinger County, Missouri 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 Bollinger County, Missouri were built in 1982 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesBollinger County, Missouri holds 5,046 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 82.3% of the occupied homes in Bollinger County, Missouri (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards for Central AC Installation in Bollinger County, Missouri8 sourced rules and standards
What happens when the contractor comes out
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 Bollinger County
Bollinger County's climate puts real demand on cooling equipment, and the workload a system carries is shaped by what the weather here actually does. That's a local fact, and it's part of what a contractor accounts for when sizing and installing central AC.
104 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.