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Sizing a central AC system in Andrew County starts with understanding what the compressor is actually asked to do here. Homes in Andrew County, MO run cooling about three months a year, from June through August. That compressor spends the rest of the calendar standing off, and long idle periods let refrigerant leaks, contactor wear, and capacitor degradation go undetected until the heat arrives. A contractor quoting an install here has to account for that fault pattern when selecting equipment and checking the existing electrical supply, because a unit that starts hard after months off puts more stress on its components in the first week of summer than it will in any other.
Ductwork laid down for a previous generation of equipment is the variable that reshapes a central AC installation here. Half the homes in Andrew County, Missouri were built in 1980 or earlier (2020-2024 ACS 5-year). A contractor pulling permits in Andrew County finds that the supply and return runs in many of these houses were sized for systems with different airflow demands than what a new central unit requires. Where the existing duct layout restricts that flow, the installation scope changes before the new equipment is even staged.
What a Central AC Installation Covers
The outdoor condenser unit sits on a concrete pad beside the house and holds the compressor and condenser coil, which are the parts that shed heat to the outside air. Inside, the air handler or furnace-mounted evaporator coil lives in a utility space, basement, or closet and is the piece that pulls heat out of the indoor air. These two units are what a new installation puts in place.
A copper refrigerant line set runs between the indoor and outdoor units, connecting the two halves of the system through the wall or floor. The thermostat mounts on an interior wall and gives the homeowner control over when the system runs. Both are part of what a contractor accounts for during a new install.
The drawing shows a typical layout, and a licensed contractor determines exactly how the system comes together in your home.
Get matched in Andrew CountyAndrew County, by the numbers
46 severe weather events were recorded in Andrew 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 Andrew County, Missouri were built in 1980 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesAndrew County, Missouri holds 7,558 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 76.7% of the occupied homes in Andrew County, Missouri (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesRules and Standards Governing Central AC Installation in Andrew County, Missouri8 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 Events in Andrew County
Weather extremes put hours on HVAC equipment, and those hours add up differently depending on where the system runs. A unit sized and installed for the conditions here will carry that load more reliably than one spec'd to a national average.
46 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.