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Sizing a central AC unit for this house is a local question, not a catalog decision. Homes in Newton County, MO run cooling about four months a year, from June through September. The compressor starts and stops on every warm day across that run, and a unit that is slightly undersized cycles harder than it should, loading the contactor and compressor motor in ways that accumulate. A contractor quoting a replacement here pulls a load calculation before specifying equipment, because a box that fits the square footage on paper and the box that fits the actual heat load of this house are often different things.
Ductwork sized for an earlier generation of equipment does not simply carry whatever comes next. Half the homes in Newton County, Missouri were built in 1984 or earlier (2020-2024 ACS 5-year). A contractor installing central AC in a house from that era has to assess whether the existing ducts can move the volume a new unit pushes, and whether the electrical service can handle the draw. If either falls short, those become part of the job before the unit itself is ever priced. The equipment selection comes after that assessment, not before.
What Goes Into a Central AC System
The outdoor condenser unit sits outside the house, usually on a concrete pad beside the foundation, and holds the compressor and condenser coil. Inside, the air handler or furnace-mounted evaporator coil sits where the ductwork begins, pulling warm air across a refrigerant-filled coil before sending it back through the house.
The refrigerant line set runs between the two units, carrying refrigerant back and forth through insulated copper tubing. The thermostat mounts on an interior wall and serves as the control point, telling the system when to run and when to stop.
The drawing shows a typical layout, and a licensed contractor determines what fits the specific configuration of your house.
Get matched in Newton CountyNewton County, Missouri, by the numbers
219 severe weather events were recorded in Newton 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 Newton County, Missouri were built in 1984 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesNewton County, Missouri holds 24,866 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 76.6% of the occupied homes in Newton County, Missouri (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesCodes & Standards Governing Central AC Installation in Newton County, Missouri8 sourced rules and standards
What Happens Once a Contractor Shows Up
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 Newton County
Weather puts a load on cooling equipment, and that load is shaped by what the local climate actually does. A central AC system sized and installed for Newton County conditions holds up differently than one spec'd for somewhere else.
219 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.