HVAC Replacement Costs in Denver, CO: 2026 Price Guide
A full HVAC replacement in the Denver metro typically runs $4,900 for an altitude-adjusted condenser-only swap up to $17,000 for a ducted heat pump install with new ductwork. Because Denver sits at 5,280 feet, equipment sizing needs altitude derating that a sea-level-focused contractor might skip, and many older homes converting from swamp coolers to central AC need new ductwork and electrical work on top of equipment cost. For the bigger picture on hiring in this market, see the Denver HVAC hub.
By Jason Green · HVAC · Published September 7, 2026 · Updated September 7, 2026 · 8 min read
What drives replacement cost in Denver
Equipment sizing at Denver's 5,280-foot altitude requires a licensed contractor to apply altitude derating to manufacturer capacity ratings, since a furnace or AC rated for sea-level performance will not deliver the same output here. Skipping this step is one of the most common reasons a newly installed system underperforms in Denver, so ask any contractor quoting a replacement how they are adjusting for altitude.
Homes in older neighborhoods like Wash Park, Park Hill, and Capitol Hill that still rely on an evaporative swamp cooler face a bigger project scope when converting to central refrigerated AC, since it typically requires new ductwork, a dedicated electrical circuit, and sometimes a new roof or attic penetration rather than a simple unit swap. Newer construction in Stapleton/Central Park more commonly already has ducted central air, which keeps replacement costs lower and closer to a straight equipment swap.
Typical Denver replacement pricing
A condenser-only AC replacement, keeping the existing furnace and ductwork, typically runs $4,900 to $8,600 in the Denver metro. A full split system replacement including a new furnace and air handler runs $7,200 to $13,500, and given Denver's long, cold heating season, furnace efficiency and proper sizing matter as much as the AC side.
Swamp cooler to central AC conversions typically run $5,500 to $12,000 depending on how much new ductwork and electrical work is needed. Ducted heat pump installs or conversions, increasingly popular given Xcel Energy's electrification rebates, run $8,500 to $17,000 depending on ductwork condition and whether backup gas heat is retained for the coldest winter nights.
Rebates and financing to check first
Xcel Energy offers heat pump and electrification rebates for Denver-metro customers installing qualifying equipment through a participating contractor, and the City of Denver runs additional home electrification rebate programs that can stack with Xcel incentives, particularly for income-qualified households 1. Ask your contractor whether they are a participating Xcel Energy trade ally, since rebate paperwork is typically easier when the installer already works within the program.
Federal tax credits for qualifying high-efficiency heat pumps may also apply on top of local rebates, though eligibility and amounts change, so confirm current details with your tax preparer or directly with Xcel Energy and the City of Denver before budgeting a specific number 2.
Licensing and permits before you sign
Colorado has no statewide HVAC contractor license, so confirm the company holds a current Denver mechanical contractor license through the city's contractor license search, and separately verify they carry liability insurance and are bonded 3. A mechanical permit filed through Denver Community Planning and Development, plus a final inspection, is required for any full system replacement inside city limits.
For a deeper look at vetting companies before you sign a contract, see our HVAC companies in Denver guide. Ready to compare quotes instead of researching alone? Get matched with vetted HVAC pros near 80211.
Typical cost ranges
| Condenser-only AC replacement | $4,900 - $8,600 |
| Full split system (furnace + AC) | $7,200 - $13,500 |
| Swamp cooler to central AC conversion | $5,500 - $12,000 |
| Ducted heat pump install | $8,500 - $17,000 |
| Ductwork resizing/repair | $1,600 - $6,800 |
Ranges are general estimates gathered from homeowner-reported quotes, not an offer or a quote for your project.
Common questions
How much does a full HVAC replacement cost in Denver?
A full split system replacement including a new furnace and air handler typically runs $7,200 to $13,500 in the Denver metro, while ducted heat pump installs run $8,500 to $17,000 depending on ductwork condition.
Why does altitude matter for HVAC sizing in Denver?
At 5,280 feet, thinner air changes equipment output, and manufacturer capacity ratings assume sea-level conditions. A licensed Denver contractor should apply altitude derating when sizing a new furnace or AC to avoid underperformance.
How much does it cost to convert a swamp cooler to central AC?
Swamp cooler to central refrigerated AC conversions typically run $5,500 to $12,000 in the Denver metro once new ductwork and a dedicated electrical circuit are included, since older homes rarely have ductwork already sized for AC.
Are there rebates for a new heat pump in Denver?
Xcel Energy offers heat pump and electrification rebates for Denver-metro customers, and the City of Denver runs additional home electrification rebate programs that can stack for income-qualified households. Confirm current amounts directly with Xcel Energy.
How do I verify a Denver HVAC contractor's license before a big replacement job?
Look up the contractor's Denver mechanical contractor license number using the city's contractor license search tool, and separately confirm the company carries current liability insurance and is bonded, since Colorado has no statewide HVAC license.
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