HVAC Repair & Replacement Cost in Denver, CO

Denver furnace, AC, and heat pump prices

† Central AC replacement: High end reflects two-stage and variable-speed equipment, larger homes, and duct modifications; a standard-efficiency change-out on sound ductwork lands in the lower half.

† Furnace replacement: Electric furnaces sit at the low end; gas furnaces run $3,800 to $10,000 in most guides, and high-efficiency condensing units push past the high end.

† Heat pump installation (air-source): Sources disagree widely (>3x): contractor-network averages (Angi, Bob Vila, Today's Homeowner) cluster near $6,000 for a like-for-like change-out, while HomeGuide, This Old House, and Carrier quote $10,000 to $25,000 for higher-efficiency and cold-climate systems. Range widened to cover both.

† Ductwork replacement: Whole-home replacement in a 1,500 to 2,500 sq ft house; replacing a few runs costs a fraction, and retrofitting ducts into a home that never had them runs above the high end.

Heating demand 2nd of 33: the furnace comes first

In budget terms, a failed furnace in Denver is an urgent call for a large part of the year, while a failed air conditioner is mostly a discomfort. NOAA's 1991-2020 normals at the Denver-Stapleton station, 1 km from the city center, show 5,765 heating degree days a year and only 813 cooling degree days. Of Denver's combined degree days, only 12% come from cooling. The January average low is 18°F, and nights fall to freezing or below 156 times a year.

Furnace repairs here run $150–$500; the usual culprits are igniters, flame sensors, pressure switches, and inducer motors. Replacement runs $2,800–$7,500. With a heating season this long, a condensing furnace earns back its higher price faster than it would in most cities on this index, and condensing units sit at the top of that row or past it because they need plastic venting and a condensate drain.

Altitude belongs on every Denver furnace quote

A gas furnace is rated for sea-level air. Up on the Front Range the air holds less oxygen, so manufacturers publish high-altitude instructions: depending on the model and the local gas supply, the installer may need to fit smaller burner orifices or a high-altitude kit, and condensing models sometimes need a different pressure switch. A furnace set up without those steps can burn rich, soot its heat exchanger, and produce more carbon monoxide.

What to ask for: the manufacturer's high-altitude setup followed in writing, a measured gas pressure and temperature rise at start-up, and a combustion analysis rather than a quick look at the flame. The same thin air trims a furnace's real output below its nameplate rating, which a proper Manual J and equipment selection should account for. A quote that matches the old furnace's nameplate size without either step is guessing twice.

Hot afternoons, cool nights, and a modest AC budget

Denver's July average high is 90°F, and the station records about 42 days a year at 90°F or above. Yet cooling degree days stay low, because dry air lets nights cool off and the daily average drops. Climate zone 5B is a dry zone, so an air conditioner here spends little effort pulling moisture out of the air compared with one in the humid South.

Fewer run hours mean an air conditioner here tends to last, a repair in the $150–$650 range is often the right answer, and a premium high-SEER2 unit pays back slowly. Colorado falls in the Department of Energy's North region, where the minimum for a new central air conditioner is 13.4 SEER2, and a standard-efficiency change-out on sound ductwork lands in the lower half of the $4,000–$12,000 replacement row.

Heat pumps on 156 freezing nights

Heat pumps are no longer warm-weather equipment only, and cold-climate models keep heating well below freezing. They cost more, which is why the heat pump row stretches from $4,200 to $15,000: standard models sit near the bottom and cold-climate systems near the top. With a January low of 18°F, a Denver install should either use a cold-climate model or keep the gas furnace as backup in a dual-fuel arrangement. A heat pump also replaces the air conditioner, so compare its price against a new furnace plus a new AC, not against either one alone.

On refrigerant: new split systems made since 2025 use R-454B or R-32 instead of R-410A. If your current AC is the older type and only the furnace is failing, ask whether the indoor coil sitting on top of the furnace will be reused, because a new coil for a new refrigerant generally means a new outdoor unit as well.

The Front Range hail reputation and what Denver County's count shows

The Front Range is known for some of the most severe hail in the country, yet Denver County's own count is moderate: 22 days with hail an inch or larger from 2016–2025, which ranks 23rd of 33. The county figure only counts reports inside Denver County's own boundary, a city-sized area, so storms that hit the surrounding suburban counties are not in it. El Paso County, home to Colorado Springs, logged 126 such days.

Hail that shreds a condenser's coil fins is the sort of event homeowners insurance usually covers, after the deductible, as it does lightning, fire, or a falling tree. A furnace or air conditioner that dies of age is not covered; insurers count that as mechanical breakdown and wear. Manufacturer warranties often cover a failed part on younger equipment but leave the labor to you, and a home warranty plan is a service contract meant for breakdowns.

Why Denver prices sit right at the national line

The labor factor here is 1.00, which puts Denver 13th of 33. The Bureau of Labor Statistics withholds the Denver metro construction wage, so this page uses Colorado's statewide figure, $1,568 a week, 1% above the national average. Colorado Springs, where a metro figure is published, comes out at 0.95. If quotes for the same job come in higher than this table, metro labor rates are a likely reason.

What Denver homeowners ask about furnaces, AC, and heat pumps

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