HVAC replacement cost in Denver
Quick answer
Angi publishes $5,290–$13,225 for replacing a furnace and air conditioner together in Denver. That is a local consumer planning estimate, not a guaranteed quote. A heat-pump conversion, new ducts or electrical service changes are different scopes and should be priced separately.
All amounts are US dollars. 'HVAC replacement' can mean just an outdoor AC unit, a matched furnace-and-AC system, or an electric or dual-fuel heat pump. Those are not interchangeable jobs. This guide is educational, not HVAC design, tax or legal advice; a home assessment and the current permit and program rules determine your actual project.
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What most people miss
Compare the installed design before the fuel choice
A furnace-plus-AC quote should list both heating and cooling equipment. A heat-pump alternative should explain design-temperature heating output, backup heat and the home's electrical and duct requirements. A lower net price after an assumed rebate is not proof that either system is the right design.
How this price is built
What the price reference covers
The cited Denver range is for combined furnace and AC replacement. It should not be used as the cost of one component, a whole-house duct rebuild or every heat-pump conversion. Ask each bidder for the gross installed price and a clear scope boundary.
Sizing and matched model numbers
Request a home-specific heating and cooling load calculation, equipment models, rated efficiency and the matched indoor coil or air handler. The old unit's capacity or house floor area alone does not establish the new system size.
Ducts and airflow
Have the bidder distinguish reused ducts from repairs, sealing, new returns and replacement. Ask what measurements or visible defects justify the proposed work. A high-efficiency box cannot fix a poorly performing distribution system by itself.
Electrical, gas and venting work
Separate circuits, disconnects, controls and any service upgrade. For a furnace, identify gas and venting changes and condensate requirements. For a heat pump, specify backup-heat requirements and the basis for electrical capacity changes.
Permits and commissioning
Denver's Quick Permits guidance covers qualifying work, not a universal permit fee for every HVAC project. Ask which permits and inspections apply to your exact scope, who files them and what startup measurements and closeout documents you receive.
Colorado and utility incentives
Colorado's Heat Pump Tax Credit Discount works through registered contractors and qualifying equipment; it is not automatically a homeowner tax credit for a furnace-plus-AC purchase. Check Xcel's applicable program if you are its customer. Show each proposed discount separately with eligibility, installer and stacking conditions.
Federal credit assumptions
IRS guidance ends the Energy Efficient Home Improvement Credit for property placed in service after December 31, 2025. Do not subtract the former Section 25C heat-pump credit from a 2026 installation. Other incentives must be checked independently, not assumed to replace it.
What makes a quote high
One component priced as a whole system
A low 'AC replacement' price may reuse the furnace, coil, thermostat or line set. Compare the same equipment boundary.
Duct or electrical allowances without a scope
Ask for quantities, locations, evidence and a change-approval process rather than an open-ended allowance.
Rebates deducted before qualification
Confirm equipment, customer territory and contractor eligibility. Ask what you owe if the program declines the claim.
Financing compared only by monthly payment
Request cash price, APR, term and total payments. A manageable monthly payment can hide a larger purchase price.
Itemised versus vague
A quote you can evaluate looks different from one you can't. This is what to look for, line by line.
| Item | A quote you can judge | A quote you can't |
|---|---|---|
| System | Furnace/AC or heat-pump scope and all model numbers | New HVAC |
| Sizing | Calculated loads, capacity and backup-heat plan | Same tonnage as before |
| Ducts | Measured issue and exact repair locations | Duct upgrade |
| Permits | Applicable permits, inspection and closeout included | Standard installation |
| Incentives | Gross price and conditional discounts separately | Net price with all rebates |
Questions to ask before you approve
- Does this replace the furnace, coil, outdoor unit and controls?
- Can I see the load calculation and matched model numbers?
- Which duct, electrical and venting work is included?
- What heating output and backup does the heat-pump alternative provide?
- Who files permits and documents commissioning?
- Which discounts are confirmed, and what do I owe if one is denied?
Message to a Denver HVAC installer
Copy these lines as they are. Politeness plus specifics gets answers.
- 1.“Please list the full equipment scope and matched models.”
- 2.“Separate ducts, electrical, venting, permits and commissioning.”
- 3.“Show the gross price and each conditional incentive separately.”
- 4.“If proposing a heat pump, explain design-temperature output and backup heat.”
When a high price is legitimate
A higher-than-expected price isn't automatically a bad one. These are the situations where it's usually justified.
- A full matched system is more scope than changing one component.
- Documented duct and return-air corrections add labor and materials.
- Electrical capacity or venting changes may be necessary for the chosen design.
- Careful commissioning, permit closeout and meaningful labor coverage add value.
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Common questions
How much does HVAC replacement cost in Denver?
Angi publishes $5,290–$13,225 for combined furnace and AC replacement. It is a planning reference; heat-pump conversion, ductwork, electrical changes and job-specific access can put your quote outside it.
Should I compare a heat pump with a furnace and AC?
Yes, if both designs serve your home's loads and comfort needs. Compare gross installation cost, cold-weather output, backup heat, ducts, electrical work and conditional incentives—not just brand or net price.
Is the federal heat-pump tax credit available for a 2026 installation?
The IRS says Section 25C does not apply to property placed in service after December 31, 2025. Check other current programs separately and seek tax advice for your own situation.
Are Colorado heat-pump discounts automatic?
No. The state program uses registered contractors and eligible equipment. Utility programs have their own customer and equipment rules. Confirm current terms and stacking before accepting a net-price proposal.
Sources
- Angi: Denver furnace and AC replacement
Published Denver planning range of $5,290–$13,225 for combined furnace and AC replacement.
- Denver: Quick Permits
Qualifying permit pathways; the page does not establish one HVAC permit fee for all scopes.
- Colorado Energy Office: Heat Pump Tax Credit Discount
Contractor-based qualifying heat-pump discount program; verify current equipment and participation requirements.
- Xcel Energy: Programs and rebates
Utility program lookup; customer territory and current equipment rules must be checked.
- IRS: Energy Efficient Home Improvement Credit
Section 25C eligibility ends for property placed in service after December 31, 2025.
Keep reading
Is this HVAC quote normal?
Tonnage, SEER2, ductwork, line sets — why two AC bids are almost never comparable.
Furnace and HVAC quotes
What to check across this whole category, wherever you are.
Home repair reserve calculator
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Last reviewed November 2026. Published price ranges are planning references, not guaranteed local quotes. Educational information only — not professional advice. See our disclaimer and browse the full cost guide library. All guides and tools