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AC Installation in Ste. Genevieve

Serving Ste. Genevieve and every community across Ste. Genevieve County.

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Step 1 of 3: Equipment
A two-story beige house with gabled roofs and a light-colored front door, fronted by a lawn with a running sprinkler, a concrete walkway, sidewalk and wet street, flanked by large green deciduous trees in low sunlight.

Size the system wrong and the compressor pays for it. Homes in Ste. Genevieve County, MO run cooling about four months a year, from June through September. A unit that is undersized cycles harder through those months, and the contactor and condenser fan accumulate wear at a rate a correctly sized system would not. Contractors pricing a new installation here run a load calculation before anything else, because a shortcut at that step produces a machine that is already behind on its service life when it starts its second cooling season.

NOAA National Centers for Environmental Information, nClimDiv county and statewide normals, 1991-2020.
Crawlspace or basement with insulated flexible HVAC duct running along wooden floor joists above a concrete block wall, with two cardboard boxes and a coiled corrugated hose on the concrete floor.

Existing ductwork is what a central AC installation turns on here. Half the homes in Ste. Genevieve County, Missouri were built in 1981 or earlier (2020-2024 ACS 5-year). Duct systems laid out for earlier equipment were sized around airflow and load expectations that do not match what a modern unit delivers, and a contractor putting in a new system has to establish whether what is already in the walls and ceilings will carry it before anything else gets priced. Electrical service gets the same look. A panel that was right for the original equipment draws a different number against today's units, and that gap has to be measured, not assumed.

U.S. Census Bureau, 2020-2024 American Community Survey 5-Year Estimates

What a Central AC System Looks Like Before Installation

Isometric cutaway illustration of a single-story house showing interior rooms with ductwork and an air handler, connected by refrigerant lines to an outdoor condenser unit on the left.

The outdoor condenser unit sits on a pad outside the house, usually along a side or rear wall. Inside, the air handler or furnace-mounted evaporator coil occupies a utility space such as a basement, attic, or mechanical closet. These are the two central pieces a contractor brings into the home.

A refrigerant line set runs between those two units, passing through a small penetration in the wall. The thermostat mounts on an interior wall and serves as the control point for the whole system, telling it when to run.

The drawing shows a typical layout, and a licensed contractor determines exactly how each piece fits into your particular home.

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Ste. Genevieve County by the Numbers

43

43 severe weather events were recorded in Ste. Genevieve 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.
1981

Half the homes in Ste. Genevieve County, Missouri were built in 1981 or earlier (2020-2024 ACS 5-year).

U.S. Census Bureau, 2020-2024 American Community Survey 5-Year Estimates
8,326

Ste. Genevieve County, Missouri holds 8,326 housing units (2020-2024 ACS 5-year).

U.S. Census Bureau, 2020-2024 American Community Survey 5-Year Estimates
83.0%

Owners occupy 83.0% of the occupied homes in Ste. Genevieve County, Missouri (2020-2024 ACS 5-year).

U.S. Census Bureau, 2020-2024 American Community Survey 5-Year Estimates
Code, Licensing, and Efficiency Rules for Central AC Installation in Ste. Genevieve County, Missouri8 sourced rules and standards

What the installation looks like from your side

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.

U.S. Department of Energy10 CFR 430.32, Energy and water conservation standards and their compliance dates, Electronic Code of Federal Regulations.Verified 2026-09-10

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.

U.S. Department of Energy10 CFR 430.32, Energy and water conservation standards and their compliance dates, Electronic Code of Federal Regulations.Verified 2026-09-10

Split-system central air conditioners manufactured between January 1, 2015 and December 31, 2022 had to meet 13 SEER, the metric that preceded SEER2.

U.S. Department of Energy10 CFR 430.32, Energy and water conservation standards and their compliance dates, Electronic Code of Federal Regulations.Verified 2026-09-10

Single-package central air conditioners manufactured on or after January 1, 2023 must meet a federal minimum of 13.4 SEER2.

U.S. Department of Energy10 CFR 430.32, Energy and water conservation standards and their compliance dates, Electronic Code of Federal Regulations.Verified 2026-09-10

Space-constrained central air conditioners manufactured on or after January 1, 2023 must meet a federal minimum of 11.7 SEER2.

U.S. Department of Energy10 CFR 430.32, Energy and water conservation standards and their compliance dates, Electronic Code of Federal Regulations.Verified 2026-09-10

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.

U.S. Department of Energy10 CFR 430.32, Energy and water conservation standards and their compliance dates, Electronic Code of Federal Regulations.Verified 2026-09-10

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.

U.S. Environmental Protection AgencyU.S. Environmental Protection Agency, Technology Transitions HFC Restrictions by Sector, implementing the American Innovation and Manufacturing Act.Verified 2026-09-10

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.

U.S. Environmental Protection AgencyU.S. Environmental Protection Agency, Technology Transitions HFC Restrictions by Sector, implementing the American Innovation and Manufacturing Act.Verified 2026-09-10

Severe Weather Events in Ste. Genevieve County

Local weather puts real demand on cooling equipment, and that demand shapes what a system needs to handle over its life. Sizing and installation decisions are local decisions, and the weather record for this area is part of that picture.

Severe weather events by county — Ste. Genevieve County
10.58530
2015201620172018201920202021202220232024
9

43 severe weather events, 2015–2024. Source: NOAA National Centers for Environmental Information, Storm Events Database.