HVAC System Replacement Cost in Fort Collins, Colorado
Expect to pay $11,200 to $24,300 for full HVAC system replacement in Fort Collins, CO. Most homeowners end up near $18,400, depending on the equipment tier and how much of the old setup can be reused.
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Fort Collins Weather and HVAC Load
In a normal year, Fort Collins racks up 5,797 heating and 624 cooling degree days (NOAA 1991-2020 normals). Heating is the bigger job here, and furnaces and heat pumps in Fort Collins put in far more hours than the air conditioner. On average, Fort Collins gets 150 freezing nights and 30 days above 90°F per year. Snowfall averages about 51 inches. For a 2,000 sq ft house, this climate points to a heating load somewhere near 65,000 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 | 5,797 |
|---|---|
| Cooling degree days / year | 624 |
| Nights at or below 32°F | 150 |
| Days above 90°F | 30 |
| Average low / high | 37°F / 64.5°F |
Fort Collins Housing Stock
Half the homes in Fort Collins were built before 1992 (Census ACS median), so the typical house is about 34 years old. Plenty of houses from this period still run original 1990s or early-2000s equipment, which is past its expected service life. Fort Collins has roughly 37,000 owner-occupied homes, or 52.1% of households. The median home value is $548,400, and median household income is $83,598. We use both figures to adjust labor and pricing for this page.
Larimer County had 22 hail days and 9 days with damaging thunderstorm winds from 2020 through 2025, according to NOAA storm records. The largest hail reported was 2.5 inches across. Hail flattens the thin aluminum fins on condenser coils and cuts airflow. After a big storm, take a look at the outdoor unit; homeowners insurance often covers the damage.
When Replacement Makes Sense
- Both units keep needing repairs
- An old R-22 AC paired with an aging furnace
- Both the heating and cooling equipment are 15 years old or more
What Moves the Price
- Duct repair or replacement
- Permits and electrical work
- Thermostat and zoning upgrades
- Equipment sized to the house and climate
- Furnace plus AC, or heat pump plus air handler
- Efficiency ratings: SEER2, AFUE and HSPF2
For Fort Collins we raised the national figures about 31%, 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
- Startup, testing and warranty registration
- New, matched heating and cooling equipment
- A load calculation and system design
- Removing the old equipment
- Duct connections and sealing
Colorado Permits, Efficiency Rules and Rebates
Colorado 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. Expect the contractor to pull a mechanical permit for a replacement job in Fort Collins. If a bidder suggests skipping it, move on. Also ask for a Colorado 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
- Get one quote for a heat pump system and one for a furnace plus AC.
- Replacing both pieces at once usually costs less than two separate jobs a few years apart.
- Make every bidder quote the same efficiency ratings, or the prices won't compare.
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HVAC System Replacement Questions from Fort Collins Homeowners
How much is full HVAC system replacement in Fort Collins?
Plan on $11,200 to $24,300, with most jobs near $18,400. Equipment efficiency, house size and the condition of the ducts and wiring decide where your quote falls.
When is the best time to schedule full HVAC system replacement in Fort Collins?
Between late spring and early fall. Fort Collins averages 150 freezing nights a year, and heating calls spike from November through February.
Can I replace only the AC and keep my furnace?
Yes, as long as the indoor coil and blower work with the new AC. A mismatched system loses efficiency and can void the warranty.
How often should an HVAC system be replaced?
Most systems get replaced every 15 to 20 years. AC units and heat pumps usually wear out before gas furnaces do.
HVAC System Replacement Near Fort Collins
- Aurora $10,700 to $23,300
- Lakewood $11,300 to $24,600
- Colorado Springs $10,600 to $23,000
- Denver $11,600 to $25,200
Sources: U.S. Census Bureau ACS 5-year estimates 2019-2023 and 2024 population estimates; NOAA NCEI U.S. Climate Normals 1991-2020, station Fort Collins; NOAA Storm Events Database 2020-2025, Larimer County. Prices are our estimates, not contractor quotes. Updated 2026.