Denver HVAC Rebates, Permits and License Checks for 2026

Denver is a heating city with a real cooling season. NOAA's 1991-2020 normals for Denver International Airport count 5,862 heating degree days and 46 days at 90°F or hotter a year. Power Ahead Colorado pays $1,500 per qualifying cold-climate heat pump. Xcel Energy set a cut to its heat pump bonus for October 1, 2026. A furnace or AC swap needs a city permit.

How cold do Denver winters get, and what does that mean for your heating system?

A heating degree day measures how far a day's mean temperature drops below 65°F. Cooling degree days track the days above that line. Summed over a year, they show roughly how hard a furnace or air conditioner has to work. The figures below are NOAA's annual normals for the Denver International Airport weather station, USW00003017.

The monthly normals for the same station put the hardest stretch in December and January, at about 1,048 and 1,034 heating degree days. July adds about 315 cooling degree days. Spring and fall are not idle either. April and October each log more than 400 heating degree days, so the furnace runs for much of the year.

What those numbers mean when you replace equipment:

• Look at the 5°F rating on any heat pump. NOAA counts about 21 nights a year at 10°F or colder and about 6 at zero or below. Xcel's product rules call a ducted heat pump cold-climate only if its capacity at 5°F is at least 70% of its rated capacity at 47°F, with a COP of 1.75 at 5°F. Ask for both numbers on the spec sheet.
• Altitude changes the output. NOAA lists the airport station at 1,650 meters, roughly 5,400 feet. In the same filing, Xcel's savings assumptions for air-to-water heat pumps apply an altitude factor to convert the maker's rated heating capacity to actual performance at the install site. Ask the installer how the sizing accounts for altitude.
• Size from a load calculation. Denver's energy code page for existing homes says a replacement system in a renovation must meet the code for new construction. An addition that grows conditioned floor area by more than 20%, or 300 square feet, whichever is less, needs ACCA Manual J, S and D calculations. A Manual J is worth asking for on any replacement. Our repair or replace guide covers that decision.
• Gas backup is often part of the deal. Xcel says customers who heat with natural gas must keep gas as backup heat to get a heat pump rebate, unless the new unit is a cold-climate model. Our dual fuel heat pump guide explains how a furnace and heat pump split the work.
• Summer heat is dry. With 46 afternoons a year at 90°F or above, cooling earns its keep. Xcel's residential product still covers evaporative coolers, in standard, premium and multi-ducted tiers.

What does Xcel Energy pay toward a heat pump or furnace in Denver?

The city's After Fire Resources page lists Xcel Energy for both electric and gas service. Xcel's rebate web pages run as a browser app that would not load for us on November 11, 2026. This section therefore relies on Xcel's own filings with the Colorado Public Utilities Commission. They spell out the rules, but not most of the per-ton dollar amounts.

The big 2026 change is the bonus. Under its Clean Heat Plan, Xcel's heat pump bonus brought the total to three times the standard rebate. Its August 2026 roundtable slides said the total was scheduled to drop to two times, the standard rebate plus one bonus, from October 1, 2026. We could not confirm on Xcel's live pages that the change took effect, so ask for the rebate in writing on the bid. Income-qualified programs are not affected.

A separate program update says homes with existing electric heat, such as baseboard, lost the bonus in late 2025. They can still get the standard rebate.

Those rules come from the Residential Heating and Cooling write-up in Xcel's first-quarter 2026 notice summary. Its filings page dates the ductless change. The write-up says rebates usually arrive by mail within eight weeks. The invoice has to match the application on model number, serial number, install address and purchase date. A rebate can never exceed the purchase price. Before you sign, ask the contractor to write the current Xcel amount for your exact model on the bid.

More of Xcel's rebated heat pumps go into Denver homes than into any other city. Its August 2026 slides count 1,471 heat pump and heat pump water heater installs in Denver through June 30, 2026, the most of any city on its list. Across Colorado, cold-climate models made up 99% of the air-source heat pumps and 96% of the mini-splits it rebated in that period.

Can lower-income Denver households get more help with heating upgrades?

Yes, and the October bonus cut did not touch it. Xcel's second-quarter update says it prequalifies customers by location, naming Denver, Aurora, Longmont and Boulder. Eligible homes get weatherization and electrification rebates that can cover up to 100% of project costs. The average incentive per finished home was about $22,000. Xcel also contacted 67,000 prequalified customers in the greater Denver area about a free Home Energy Squad Plus visit.

If a letter or email from Xcel says you are prequalified, it is worth answering. For other customers, the same update says standard Home Energy Squad visits cost 50% of the normal price through 2026. Xcel has also launched on-bill repayment with the Colorado Clean Energy Fund, so qualifying upgrades can be paid off on your utility bill.

Which other heat pump rebates and credits apply in Denver in 2026?

Beyond Xcel, here is where the other programs stood on November 11, 2026. The two that pay today both run through your contractor, not through you.

• Power Ahead Colorado, $1,500. The Denver Regional Council of Governments launched it in July 2026, and Denver is on DRCOG's member list. The program requirements pay $1,500 per cold-climate heat pump system in an existing home, where a system is one outdoor unit and its indoor units. An enrolled contractor must get preapproval before work starts. The rebate stacks with utility, city and state incentives, but not with the federal HEAR or HER rebates. The budget is $40 million for 2026 to 2029.
• Colorado heat pump tax credit. Only a contractor registered with the Colorado Energy Office can claim it, and that contractor must give you a discount shown as a separate line on the invoice. That is how the Department of Revenue's 2025 worksheet describes it. For 2025 installs, the worksheet sets the credit at $1,500 per air-source heat pump, $3,000 per ground-source unit and $500 per heat pump water heater. It does not say how large your discount must be, and we found no 2026 version. HB26-1289, signed June 3, 2026, removed a possible forecast-triggered cut to the credit for years after 2025.
• Federal Home Energy Rebates. Denver's homeowner incentives page sends you to the Colorado Energy Office for state-run rebates, and Power Ahead names the federal HEAR and HER rebates. The Energy Office website refused every request we made on November 11, 2026, so we cannot confirm which are open or what they pay. The Department of Energy says only that the rebates are available in select states, and points you to your state energy office.
• The City of Denver. The city's building rebates page lists grants for commercial buildings, multifamily and affordable housing, and no heat pump rebate for single-family homes. The same homeowner incentives page describes a heat pump group buy but does not say whether sign-ups are open.
• Federal tax credit. The IRS says the energy efficient home improvement credit covers improvements made through December 31, 2025. A system installed in 2026 does not qualify.

Do you need a permit to replace a furnace or AC in Denver?

Yes. Denver Community Planning and Development (CPD) lists residential AC, compressor units, ductwork and forced-air heating systems among the work it issues as quick permits for single-family homes and duplexes. A quick permit skips plan review, and an inspector checks the work in the field. In a September 15, 2026 post, CPD said every residential space heating and water heating permit is already issued this way.

Some jobs fall outside it. The quick permit page rules out replacements that are not one-for-one and equipment the system was not designed for. It also excludes units over 300 MBH, meaning 300,000 Btu per hour, unless it is an emergency replacement. The page does not say whether these exclusions are written for homes or for commercial work.

Trading a furnace and AC for a heat pump, or adding a unit, may not count as one-for-one, so ask CPD which route applies. Plan review answers at [email protected] or 720-865-2720.

You can pull the permit yourself, but CPD's homeowner rules for HVAC work are strict:

1. Own the house and live in it. Your photo ID must match the Assessor's records. Trusts, LLCs and corporations cannot get homeowner permits.
2. Pass the homeowner exam. Mechanical and HVAC work requires it. A state license can stand in for the electrical or plumbing exam, but not the mechanical one.
3. Apply by email. Homeowners cannot use e-permits for a quick permit. Send the application and a copy of your photo ID to [email protected]. CPD replies with payment instructions, then emails the permit.
4. Do the work yourself. Unless CPD approves your written request to act as your own general contractor, the person on the permit does the work. An unpaid helper listed on the permit as a designated worker may assist.
5. Stay for a year. You must live in the home for at least one year after the work is finished.

If you hire the job out, CPD's tips for hiring a contractor warn against anyone who wants the permit in your name. Whoever holds the permit answers for finishing the job to code. Hold the final payment until the inspections are approved, and never pay in cash.

How do you check an HVAC contractor's license in Denver?

Denver licenses its own contractors. Its Contractor Licensing page says the city does not accept licenses or certificates from other counties or states. A company first needs someone holding a supervisor certificate, then a Denver contractor license. Look a company up in the city's Verify a Contractor's License search. Licensing staff answer at [email protected] or (720) 865-2770, Monday to Thursday.

For home heating and cooling, CPD's mechanical certificates page lists these classes. The residential ones are limited to one- and two-family homes and townhomes.

The page never mentions heat pumps by name. For a heat pump job, ask which certificate the supervisor holds and whether it covers refrigeration work.

Rebates add three more lists to check. Xcel pays its main heat pump rebates only through its registered contractors. Power Ahead pays only through contractors enrolled in its program. The state credit goes only to contractors registered with the Colorado Energy Office. A company can be on one list and not the others.

Company websites seldom make any of this easy to see. The table below sets our audit of Denver-area HVAC company sites beside the figures for all the cities we have checked. It counts sites that show no Google rating, sites with no form, slow loading on a phone and oversized menus. It is a snapshot of firms that advertise on Google, not a census of every contractor in the city.

Here is how to work around those gaps:

• Open the company in Google Maps and read its latest reviews, the one-star ones too. A site that shows no rating tells you nothing about the work.
• If there is no form, phone the office. Ask for the Denver contractor license number and the supervisor's name, then check both in the city search before anyone comes out.
• Ask which of the three rebate lists the company is on. Have each rebate and the state credit discount written as its own line on the bid.
• Ask whose name will be on the CPD permit, and keep the last payment until the final inspection passes.

Our guide to comparing HVAC quotes covers what else a written bid should show.

What should you do if you smell gas in Denver?

Get out first, then call. The federal pipeline safety agency's emergency guidance says natural gas carries a rotten-egg odor. If you smell it indoors, do not strike a match, start an engine, flip a light switch or use a garage door opener. Do not use any phone, cell phones included, while you are inside. Leave and call 911 from a neighbor's home or another spot well away from the leak.

Then report it to Xcel Energy. The city's After Fire Resources page lists Xcel's gas line as 1-800-895-2999 and its electric line as 1-800-895-1999. If you can do it safely, warn neighbors to keep clear and not to create sparks.

A furnace can also leak carbon monoxide, a gas with no odor at all. Our furnace carbon monoxide guide explains the warning signs and the first steps to take.

Questions people ask