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Getting the load calculation right before any equipment is ordered matters more than most homeowners expect. Homes in Gasconade County, MO run cooling about three months a year, from June through August. The compressor, the condenser fan, and the contactor each start and stop dozens of times on a hot July day, and an undersized system runs those components harder to keep up. A contractor who skips a proper Manual J and installs to a rough estimate gives the homeowner a system that reveals that shortcut during the stretch when it has no rest.
Ductwork laid down for an older system was sized and routed for that system, and a new central AC unit draws differently enough that a contractor has to check whether what is in the walls will actually carry it before pricing anything else. Half the homes in Gasconade County, Missouri were built in 1976 or earlier (2020-2024 ACS 5-year). That vintage of construction also means the electrical service in a given house may have been expanded piecemeal over the decades, so what the panel can hand a new unit is something a contractor reads on site, not from the address.
What a Central AC System Includes
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 conditioned air enters the duct system. These two units are the core of what gets put in place.
A refrigerant line set runs between the indoor and outdoor units, and a thermostat on an interior wall gives the homeowner control over the whole system. An electrical disconnect box mounts near the outdoor unit as a local shutoff point for the contractor.
The drawing alongside shows a standard layout, and a licensed contractor determines exactly how these pieces apply to your house.
Get matched in Gasconade CountyGasconade County, by the numbers
41 severe weather events were recorded in Gasconade 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 Gasconade County, Missouri were built in 1976 or earlier (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesGasconade County, Missouri holds 7,574 housing units (2020-2024 ACS 5-year).
U.S. Census Bureau, 2020-2024 American Community Survey 5-Year EstimatesOwners occupy 80.9% of the occupied homes in Gasconade 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 Gasconade County, Missouri8 sourced rules and standards
What happens when the 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 Gasconade County
Weather puts a workload on cooling equipment, and that workload varies by where you are. A contractor sizing and installing central AC here is working from conditions specific to Gasconade County, not a national average.
41 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.