Denver, CO · 2026
Furnace repair in Denver
By the HeatAndAirCost editors · Last updated October 5, 2026 · How we research prices
Short answer
A furnace repair in Denver runs $125 to $480 for most jobs, with a national average near $350 and a $75 to $200 diagnostic fee before any parts. Denver sits a mile above sea level, and that thinner air changes how a furnace burns fuel, which is worth knowing before a technician quotes you.[1]
Why Denver's altitude matters for your furnace
Denver sits at roughly 5,280 feet, and at that elevation the air holds less oxygen than at sea level. Gas furnaces have to be derated for altitude: the manufacturer specifies a reduction in the input firing rate above about 2,000 feet, and a furnace set up as if it were at sea level will run rich, soot the burners, and trip on flame or limit faults. If your unit was installed by someone unfamiliar with high-altitude setup, that is a real and common source of no-heat calls along the Front Range.
Denver's winters are cold and dry, with January design temperatures well below freezing, but the bigger seasonal stress is the daily swing. A sunny 60-degree afternoon can drop to the teens overnight, which cycles the furnace hard and exposes weak igniters and flame sensors. Dry indoor air is also common here, and it makes static and cracked heat exchangers more noticeable.
When you get a quote in Denver, it is fair to ask whether the technician has confirmed the furnace is properly derated for altitude. A correctly set-up furnace at 5,280 feet is quieter, cleaner-burning, and less likely to nuisance-trip.
Common no-heat problems in a Denver winter
Most furnace calls in Denver trace back to a short list of causes, and some cost nothing to rule out. Work the free checks first.
- Furnace won't turn on at all. A dead thermostat battery, a tripped furnace switch, a clogged filter, or an ajar access panel can all shut a furnace down. Cold, dry Denver air makes filters load up faster during heating season.
- Runs but blows cold air. A furnace that starts and then blows cold usually points to a flame sensor, igniter, or a burner that is not staying lit, which altitude-related rich combustion can aggravate here.
- Short cycling on cold mornings. An overheating furnace with a dirty filter, or an oversized furnace that satisfies the thermostat too fast, will cycle on and off. Denver's big overnight temperature swings make short cycling easy to notice.
Who licenses HVAC contractors in Colorado
Colorado has no statewide HVAC contractor license. Trade licensing is handled at the local level, so who you hire in Denver is regulated by the City and County of Denver rather than the state.
Denver Community Planning and Development issues contractor licenses and supervisor certificates for construction and trade work, and Denver does not reciprocate licenses from other counties or states. Before you hire, ask for the contractor's Denver license and confirm they pull a mechanical permit for any furnace replacement or gas work.[3]
Denver areas we can connect you across
The independent, licensed contractors we work with serve the Denver metro, including:
Capitol Hill · Wash Park (Washington Park) · Cherry Creek · Highlands (LoHi) · Berkeley · Park Hill · Stapleton / Central Park · Sloan's Lake · Congress Park · Baker · Five Points · University Hills · Green Valley Ranch · Lakewood · Aurora · Littleton · Arvada · Westminster
We are not a contractor and do not have an office in Denver. We connect you with independent, licensed HVAC contractors who serve these areas.
Denver by the numbers: climate, energy prices, homes and contractors
Federal figures for Denver, each linked to its source and dated. They describe local conditions; they are not quotes and do not rate any business.
How hard Denver's climate works an HVAC system
Degree days count how far each day's average temperature sits from 65°F. Heating is the bigger job here. A normal year carries about 7.1 times as many heating degree days as cooling degree days, so the furnace or heat pump logs far more run time than the air conditioner. At this station the normal summer high is 87°F (June through August) and the normal winter low is 18°F (December through February).
Source: NOAA NCEI U.S. Climate Normals, 1991 to 2020, station DENVER-STAPLETON (USW00023062), 0.6 miles from the Census center point of Denver. Data as of 1991-2020. Retrieved October 5, 2026.
What electricity and natural gas cost in Colorado
Homes in Colorado paid an average of 15.85 cents per kilowatt-hour in 2025, 8% below the U.S. average of 17.30 cents. Natural gas delivered to homes averaged $10.58 per thousand cubic feet in 2024, 27% below the U.S. figure of $14.50. Most Denver homes heat with utility gas (see the next block), so the gas price drives the winter bill, while the furnace blower and controls draw electricity. Comparing a repair quote against the cost of a new unit? Our furnace replacement cost guide has the ranges.
Source: U.S. Energy Information Administration, Colorado state energy profile and electricity data browser (average retail price, residential sector), and natural gas prices by state (price delivered to residential consumers). The $ per 1,000 kWh figure is the state average price times 1,000. Data as of 2025 / 2024. Retrieved October 5, 2026.
How Denver homes heat, and how old they are
Utility gas heats 61% of occupied homes in Denver and electricity heats 36%, so a gas furnace is the most common setup. The usual gas-furnace failures are covered in furnace not turning on. Half of the city's housing units were built in 1975 or earlier, and 56% predate 1980, while 20% went up in 2010 or later. Our HVAC lifespan guide explains how long furnaces, air conditioners and heat pumps typically last.
Source: U.S. Census Bureau, American Community Survey 2020-2024 ACS 5-year estimates for Denver city, Colorado, table B25040 (House Heating Fuel) and table B25034 (Year Structure Built). Survey estimates carry margins of error; percentages are our arithmetic on the published counts. Data as of 2020-2024. Retrieved October 5, 2026.
Plumbing, heating and air-conditioning businesses in Denver County
The Census Bureau counted 159 plumbing, heating and air-conditioning contractor establishments in Denver County in 2023, with 2,798 employees between them. The industry code (NAICS 238220) includes plumbers and counts business locations, not licenses, so treat it as an upper bound on HVAC firms. It names no company; check any contractor's license before you hire.
Source: U.S. Census Bureau, County Business Patterns 2023, NAICS 238220 (program overview). Payroll per employee is annual payroll divided by employees. Data as of 2023. Retrieved October 5, 2026.
What HVAC technicians earn in the Denver-Aurora-Centennial, CO area
The median heating, air-conditioning and refrigeration mechanic in the Denver-Aurora-Centennial, CO metro area earned $71,580 a year in May 2025, 17% above the national median of $61,010. An invoice adds parts, travel, overhead and margin to that wage, so read it as context for labor rates, not a price; our service call cost guide breaks a bill down.
Source: U.S. Bureau of Labor Statistics, Occupational Employment and Wage Statistics, May 2025, metropolitan areas, occupation 49-9021, area code 19740 (data file). The U.S. comparison uses the national estimate from the same release. Data as of May 2025. Retrieved October 5, 2026.
Know a fair price first
Before you accept any furnace repair quote in Denver, compare it against our researched national ranges on the furnace repair cost page. If your system is older and the quote is steep, run the $5,000 rule and check furnace replacement cost before you commit[2].
Before you call: try the free checks
Not every heating problem is a repair. Work through the no-tool checks on our furnace not turning on and furnace blowing cold air guides, and read how to choose an HVAC contractor before you hire.
More guides for Denver homeowners
Start from the symptom you are seeing on the HVAC troubleshooting hub or the HVAC symptoms index, then check the fair price for the repair you are quoted.
Other cities we cover
Labor rates and the failures that show up first change with the climate, so the city pages are written one at a time rather than stamped out. Every metro we have published so far is on the service areas hub.
Nearest city guides
- Furnace repair in Aurora, CO (9 miles away)
- AC repair in Colorado Springs, CO (62 miles away)
- AC repair in Albuquerque, NM (336 miles away)
- AC repair in Amarillo, TX (357 miles away)
- Furnace repair in Salt Lake City, UT (378 miles away)
- AC repair in Lubbock, TX (459 miles away)
How this works, and how we get paid
HeatAndAirCost connects homeowners with independent, licensed HVAC contractors. The service is free to you: contractors pay us, and that never changes what you pay. We are not a contractor, we do not perform repairs, and the prices on this site are researched ranges, not quotes.
- Free to homeowners
- Independent licensed contractors
- Contractors pay us, not you
- Researched price ranges, not quotes
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Angi is a national marketplace for home services. You describe the job, and heating and furnace contractors who work in your area contact you with their own quotes. Requesting quotes is free and you are never obliged to hire anyone.
Angi pays us a referral fee for a completed service request. The fee comes from Angi, not from you, and it does not change the cost figures on this page.
Is this covered by a home warranty?
A home warranty is an annual service contract that pays to repair or replace covered home systems and appliances when they fail from normal use, in exchange for a monthly premium and a fixed service fee per visit. It does not cover a failure that has already happened or a fault that existed before the plan started, so it only helps if it is in place before the breakdown.
Choice Home Warranty pays us a referral fee for a quote request made through this link. You pay nothing extra. We do not sell warranties and we are not an insurer.
People also ask
Denver furnace repair FAQs
What's the average furnace repair cost in Denver?
Most furnace repairs run $125 to $480, with a national average near $350. Simple fixes like a flame sensor or thermostat sit at the low end; a blower motor, control board, or heat exchanger can reach $600 to $2,000 or more. Expect a $75 to $200 diagnostic fee before parts. These are researched 2026 ranges, not Denver quotes.
What is the most common problem of a furnace?
The most common furnace problems are a dirty or failed flame sensor, a worn hot-surface igniter, a clogged air filter, and thermostat faults. In Denver, a furnace that is not properly derated for the mile-high altitude can also run rich and nuisance-trip more often.
Does high altitude affect a furnace in Denver?
Yes. At Denver's elevation near 5,280 feet the air holds less oxygen, so gas furnaces must be derated, meaning the input firing rate is reduced per the manufacturer's instructions. A furnace set up as if it were at sea level burns rich, soots the burners, and can trip on flame or limit faults.
Do I need a licensed contractor for furnace work in Denver?
Colorado has no statewide HVAC license, but the City and County of Denver licenses contractors locally. Ask for the contractor's Denver license and confirm they pull a mechanical permit for a furnace replacement or any gas work.
What is the $5,000 rule for HVAC?
Multiply your furnace's age in years by the repair quote. If the result tops $5,000, replacement usually makes more sense; under $5,000, repair. A $400 repair on a 10-year-old furnace scores 4,000, so you repair; the same repair on a 15-year-old furnace scores 6,000, which leans toward replacement. Our $5,000 rule guide walks through the full math.
Ready when you are
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Compare any quote against our researched 2026 ranges, then get connected with independent, licensed HVAC contractors serving Denver when you are ready. Free to you.