Furnace Replacement Cost in St. George, Utah
Our 2026 estimate for furnace replacement in St. George, UT is $3,500 to $8,400. That puts St. George 8% above the national average, mainly because of higher incomes and home values, which push labor rates up.
Compare Free Quotes in St. George
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. For a 2,000 sq ft house, this climate points to a heating load somewhere near 45,000 BTU/h. Treat that as a starting number. A Manual J calculation will move it up or down based on insulation and windows.
| 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 Replacement Makes Sense
- A repair quote runs past a third of the cost of a new unit
- Some rooms stay cold, the burner short-cycles, or the ignitor keeps failing
- A tech found a cracked heat exchanger, or the CO detector has gone off
- The furnace is 15 to 20 years old or more
What Moves the Price
- Single-stage, two-stage or modulating gas valve
- AFUE rating: a basic 80% unit vs. a 96% condensing furnace
- Condition of the existing ductwork and any changes it needs
- BTU size, which should come from a Manual J load calculation
- New PVC venting if you move to a condensing model
- Permit and inspection fees, which the local building department sets
For St. George we raised the national figures about 8%, 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
- Combustion and safety tests
- The new furnace, filter rack and thermostat wiring
- Removing and hauling away the old furnace
- The permit and the manufacturer warranty registration
- Gas line and vent connections
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
- Make sure all three quotes are for the same AFUE and staging, or you can't compare them.
- Ask for the Manual J load calculation in writing. Oversized furnaces are the most common mistake we see.
- Replace it in early fall if you can. A no-heat emergency in January costs more and leaves you fewer choices.
Get Free Furnace Replacement Quotes in St. George
Tell us where you are and up to three licensed local pros will get in touch. You don't have to hire any of them.
Furnace Replacement Questions from St. George Homeowners
How much is furnace replacement in St. George?
Plan on $3,500 to $8,400, with most jobs near $6,200. Equipment efficiency, house size and the condition of the ducts and wiring decide where your quote falls.
When is the best time to schedule furnace replacement in St. George?
In spring or fall. Those are the slow months between heating and cooling season in St. George.
How long does a furnace replacement take?
A straight swap is usually done in one day, somewhere between 4 and 10 hours. Moving to a condensing furnace with new PVC venting can add a few more.
Is a high-efficiency furnace worth it?
In cold climates, a 95%+ AFUE furnace usually earns back the price difference in lower gas bills. Where winters are mild, the payback can take a very long time.
Furnace Replacement Near St. George
- Provo $3,600 to $8,800
- West Jordan $4,200 to $10,100
- West Valley City $3,800 to $9,400
- Salt Lake City $3,800 to $9,300
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.