Furnace Installation Cost in Denver (2026 Pricing Guide)
Real 2026 furnace installation pricing across the Denver metro — what an 80% vs. 96% AFUE furnace actually costs, where the money goes, and how to size right.
A new furnace install in the Denver metro in 2026 typically runs $4,800 to $9,500 for a standard residential change-out, and $10,000+ for high-efficiency models with venting and duct modifications. Here is what actually drives the number.
80% AFUE vs. 96% AFUE — what you are paying for
An 80% single-stage furnace is the entry point: cheap to install (typically $4,800-$6,500), uses your existing metal vent, and burns 20 cents of every gas dollar out the flue. A 96% modulating furnace ($7,500-$10,500 installed) recovers most of that heat, runs quieter, holds temperature within a degree, and needs new PVC venting for combustion air and condensate. On a Denver home that burns 800 therms a year, the efficiency difference is real money.
Where the install cost actually goes
Equipment (furnace itself): typically 40-50% of the bill. Labor (removal, install, gas piping, venting, condensate, wiring, startup, and code inspection): 30-40%. Duct adaptations, thermostat, permit, and safety accessories: 10-20%. When one quote is 30% under everyone else, one of those categories is being skipped.
Sizing — the difference between comfort and a bad install
The correct BTU size for a Denver home is set by a Manual J load calculation, not by matching whatever came out. Oversized furnaces short-cycle, wear early, and create hot/cold rooms. Undersized ones run constantly and never catch up on a -5°F night. A proper load calc takes about an hour and belongs on every quote.
Brands we install in the Denver metro
Lennox, Carrier, Trane, Rheem, Goodman, Bryant, Amana. Brand matters less than installer craft — a mid-tier furnace installed correctly outlasts a top-tier one installed sloppy. Ask what factory warranty comes with the unit and get it in writing.
Rebates and tax credits (Colorado 2026)
Xcel Energy currently offers rebates on 95%+ AFUE furnaces (amounts change quarterly). The federal 25C tax credit covers 30% of qualifying high-efficiency furnace costs up to $600. We flag every currently active incentive on our written estimates.
How to get a real quote
A good furnace estimate is done in your home, not over the phone. We look at the existing unit, ducts, gas line, and vent, run a load calc, walk you through the options, and email a written quote. Estimates are free. Call 720-256-5118 or use our contact form to book.
How long does furnace installation take?
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A straight change-out (same size, same fuel, same venting) is one day. High-efficiency conversions with new venting are one to two days.
Do I need a permit to replace a furnace in Denver?
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Yes — Denver, Aurora, and every metro jurisdiction require a mechanical permit and inspection. We pull the permit on every install.
Should I replace my AC at the same time?
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Only if your AC is over 12 years old or the refrigerant is R-22. Otherwise, replacing the furnace alone is fine — the coil and lineset can stay.
Is financing available?
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Yes. We work with lenders that offer 0% and low-APR programs for qualified buyers. Ask about current options when you book the estimate.
AC, furnace, heat pump, or ductwork trouble in the Denver metro?
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