AC Installation in St. George

Serving St. George and every community across Washington County.

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Step 1 of 3: Equipment

What kind of equipment?*

A two-story house with tan horizontal siding and a dark shingled roof, fronted by a mowed lawn, trimmed shrubs, leafy trees on both sides, and a concrete walkway leading from a wet sidewalk to the white front door.

Getting the sizing right matters more in a desert cooling climate than a contractor's rule-of-thumb table can tell you. Homes in Washington County, UT run cooling about four months a year, from June through September. A compressor that is undersized for the actual load starts and stops harder through those months, and the contactor and condenser fan take that same punishment on every cycle. A contractor quoting a new central AC system here has to run a proper load calculation against the house envelope, not carry over whatever tonnage was installed before.

NOAA National Centers for Environmental Information, nClimDiv county and statewide normals, 1991-2020.

Unfinished basement with concrete block walls, exposed wood floor joists and galvanized metal ductwork overhead, and a stack of split firewood on a concrete floor scattered with sawdust.

Ductwork sized and routed for central air is already in most houses here, and the electrical service was put in expecting it. Half the homes in Washington County, Utah were built in 2003 or earlier (2020-2024 ACS 5-year). That means a contractor pricing a new central AC system is not hunting for a workaround before the job starts. The variables that drive scope and cost are the condition of what is already there and the unit that has to run on it, not a gap between what the house was built for and what modern equipment needs.

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

What a Central AC Install Puts in Your Home

Isometric cutaway illustration of a single-story house showing interior rooms, ceiling ductwork, an indoor air handler, and an outdoor condenser unit connected by lines, in gray and white tones on a white background.

The outdoor condenser unit sits on a pad beside the house and holds the compressor and condenser coil. Inside, the air handler or furnace with an evaporator coil sits in a utility space, basement, or closet. These two units are what a homeowner is buying when they install a central system.

A refrigerant line set runs between the two units, connecting the indoor and outdoor sides. A programmable thermostat mounts on a main-floor wall and gives the homeowner control over the whole system. Each of these pieces is part of what a contractor quotes and places during the install.

The drawing alongside shows a typical layout, and a licensed contractor determines exactly how each piece fits the conditions of your specific home.

Get matched in Washington County

Washington County, Utah, by the numbers

110

110 severe weather events were recorded in Washington County, Utah between 2015 and 2024.

NOAA National Centers for Environmental Information, Storm Events Database, bulk CSV export, events 2015-01-01 through 2024-12-31.

2003

Half the homes in Washington County, Utah were built in 2003 or earlier (2020-2024 ACS 5-year).

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

82,189

Washington County, Utah holds 82,189 housing units (2020-2024 ACS 5-year).

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

71.6%

Owners occupy 71.6% of the occupied homes in Washington County, Utah (2020-2024 ACS 5-year).

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

Rules & Standards for Central AC Installation in Washington County, Utah10 sourced rules and standards

What happens on installation day in Washington County

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.