AC Installation Cost in St. George, Utah
New AC installation in St. George runs about $8,300 for a typical job. Basic installs start near $4,900. High-efficiency equipment with duct or electrical work can reach $11,100.
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St. George Weather and HVAC Load
NOAA's 1991-2020 climate normals put St. George at 3,205 heating degree days and 2,416 cooling degree days per year. Neither season dominates in St. George. That balance is a big reason heat pumps and dual-fuel systems sell well in Utah. Count on roughly 62 nights below 32°F and 128 afternoons past 90°F in a typical year. Snowfall averages about 1 inches. On the cooling side, a 2,000 sq ft house here usually needs around 3.5 tons. A tight, well-insulated house may get by with half a ton less.
| Heating degree days / year | 3,205 |
|---|---|
| Cooling degree days / year | 2,416 |
| Nights at or below 32°F | 62 |
| Days above 90°F | 128 |
| Average low / high | 48.2°F / 77.3°F |
St. George Housing Stock
Census figures put the median build year in St. George at 2000, so a typical house here has about 26 years on it. Plenty of houses from this period still run original 1990s or early-2000s equipment, which is past its expected service life. About 24,000 households here own their home, 68.2% of the occupied total. With a median household income of $72,870 and a median home value of $456,900, local labor rates come out near the national middle in our model.
NOAA storm reports for Washington County show 4 hail days and 15 days with damaging thunderstorm winds over the six years from 2020 to 2025. The largest hail reported was 1 inches across. Storms here are more likely to cause power surges than coil damage, so a surge protector on the outdoor unit is worth the small cost. In St. George, 22% of residents are 65 or older. For older adults, a house with no heat in January or no AC during a heat wave is a medical risk. Mention it when you call, since many companies put those calls first.
When It Makes Sense
- It still runs on R-22 refrigerant
- The house can't reach the thermostat setting on hot afternoons
- Summer electric bills keep going up
- The AC is 12 to 15 years old or more
What Moves the Price
- Electrical work such as a new disconnect, breaker or wiring
- Whether the coil and line set also need replacing
- The pad, permit and refrigerant (R-410A or the newer R-454B)
- Tonnage, based on house size and local climate
- SEER2 rating and whether the compressor is single-stage or variable-speed
For St. George we raised the national figures about 17%, based on local income, home values and climate-based equipment sizing. Get at least three written quotes; real bids can land outside this range.
What the Quote Should Cover
- The electrical disconnect and wiring
- The new condenser, coil and, if needed, line set
- Removing the old condenser and coil
- Startup, an airflow check and warranty registration
- Refrigerant charge and a leak test
Utah Permits, Efficiency Rules and Rebates
Utah falls in the DOE's North region. New split central air conditioners must meet at least 13.4 SEER2, and heat pumps sold anywhere in the U.S. need 14.3 SEER2 and 7.5 HSPF2. Plan on a mechanical permit for most replacements in St. George; the contractor normally pulls it. Before you sign, ask each bidder for their Utah license or registration number and proof of insurance. The federal 25C tax credit ended for equipment installed after December 31, 2025, so incentives now come mostly from utilities and state programs. Check your electric and gas utility's rebate page before you pick equipment.
Before You Hire
- Buy the condenser and coil as a matched set, or you may void the manufacturer warranty.
- Ask for a Manual J calculation. "Same size as the old one" isn't sizing.
- Fall and early spring installs often come with better pricing and shorter waits.
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AC Installation Questions from St. George Homeowners
How much is new AC installation in St. George?
Plan on $4,900 to $11,100, with most jobs near $8,300. Equipment efficiency, house size and the condition of the ducts and wiring decide where your quote falls.
When is the best time to schedule new AC installation in St. George?
In spring or fall. Those are the slow months between heating and cooling season in St. George.
What size AC do I need?
It depends on square footage, insulation, windows and climate. The rough rule is a ton for every 450 to 650 sq ft, but only a Manual J calculation gives you a real number.
How long does a new AC last?
With yearly maintenance, 12 to 17 years. Salt air and extreme heat shorten that.
AC Installation Near St. George
- Provo $4,200 to $9,500
- West Jordan $4,800 to $10,900
- West Valley City $4,500 to $10,200
- Salt Lake City $4,600 to $10,300
Sources: U.S. Census Bureau ACS 5-year estimates 2019-2023 and 2024 population estimates; NOAA NCEI U.S. Climate Normals 1991-2020, station St. George; NOAA Storm Events Database 2020-2025, Washington County. Prices are our estimates, not contractor quotes. Updated 2026.