HVAC Replacement Cost Calculator

How this estimate works

Each system type uses a published installed-cost range: gas furnaces by efficiency and central AC by tonnage from HomeGuide, cold-climate heat pumps from Power Ahead Colorado’s Denver-region cost summary, dual-fuel from Fixr and mini-splits by zone count from HomeGuide. Extras add their own published ranges. Incentives are subtracted only for heat pump systems.

Altitude matters in Colorado: gas furnaces lose roughly 4% of output per 1,000 feet, and condensing furnaces need different venting. See our altitude guide and the full 2026 Denver HVAC cost guide.

Questions

Are these MrFixer prices?

No. The calculator uses published market ranges from Power Ahead Colorado, Angi, HomeGuide and Fixr, each linked below. Your real price depends on the house, the equipment and what the inspection finds. We give a written price after an in-home visit.

Why is a heat pump so much more than an AC?

A cold-climate heat pump replaces both heating and cooling for most of the year and uses bigger, inverter-driven equipment. Power Ahead Colorado’s Denver-region estimates put a 3-ton cold-climate system at $18,000–$24,000 before incentives. Incentives such as the $1,500 Power Ahead rebate and Colorado’s heat pump credit bring that down.

Is the federal tax credit included?

No. The federal 25C credit ended for equipment installed after December 31, 2025, so it is not part of 2026 estimates.

How do I know what size system I need?

The size picker uses a rough rule of thumb from square footage. The right size comes from a Manual J load calculation that accounts for your insulation, windows and altitude, which we do on every replacement estimate.

Sources
1. HomeGuide — gas furnace prices
2. HomeGuide — HVAC / AC replacement cost guide
3. HomeGuide — ductless mini-split cost
4. HomeGuide — ductwork replacement cost
5. HomeGuide — electrical panel cost
6. HomeGuide — AC repair cost (line sets)
7. Power Ahead Colorado — cost summary (Denver region)
8. Power Ahead Colorado — rebate program
9. Fixr — hybrid (dual-fuel) heat pump cost
10. Angi — Denver heating & cooling system cost
11. Colorado Energy Office — heat pump tax credit
12. IRS — 25C credit ended after 2025
13. ENERGY STAR — when to replace
14. EIA — Colorado residential natural gas price
15. EIA — Colorado electricity profile
16. ACHR News — furnaces at high altitude