Install Before Dec 31? A Utah Homeowner's Year-End HVAC Rebate & Tax Checklist

First, the myth to retire: there's no 25C deadline in 2026

Let's clear this up before anything else, because it changes the whole calculus. For several years the federal 25C Energy Efficient Home Improvement Credit gave homeowners up to $2,000 back on a qualifying heat pump and up to $600 on a high-efficiency furnace or air conditioner. Under the One Big Beautiful Bill Act signed in 2025, that credit was terminated for any equipment placed in service after December 31, 2025.

In plain terms: a new HVAC system installed in 2026 does not qualify for the federal 25C tax credit. There is no federal HVAC tax credit for residential equipment this year, which means there's no federal December-31 finish line to sprint toward. If a salesperson tells you to install now "before the tax credit goes away," they're describing last year.

The one exception is timing that's already behind most people: if you installed qualifying high-efficiency equipment on or before December 31, 2025, you can still claim the 25C credit on your 2025 tax return (the one filed in early 2026). If that's you, keep your invoice and the manufacturer's certification statement and talk to your tax preparer. For any project happening now, plan as if the federal credit is off the table — because it is. Always confirm your own situation with a qualified tax professional. We cover the full picture in our 2026 guide to HVAC financing, rebates, and the 25C tax credit.

So does year-end still matter? Yes — here's why

Losing the federal credit doesn't make December a non-event. If you're weighing a new system this fall, four real reasons still put a value on getting it done before the calendar flips.

1. Rebate amounts reset with the program year

The utility rebates that most Utah homeowners actually use — Rocky Mountain Power's Wattsmart and Enbridge Gas's ThermWise — aren't fixed forever. They run on annual program cycles, and the utilities file revised measures and amounts with the Utah Public Service Commission each fall. That means the rebate you can see and count on today isn't guaranteed to be the same offer, at the same dollar amount, in January. Installing while the current rebate is on the books is the surest way to lock it in.

2. The paperwork clock starts at your install date

Rebates aren't automatic — you file for them, and there's a deadline. Wattsmart applications are typically submitted within about 90 days of installation, and ThermWise rebate requests must be postmarked within six months of the install date. Because those windows begin the day your system goes in, a late-fall install still leaves you plenty of runway to gather documents and file. Wait until a January breakdown, and you're doing paperwork in a hurry during the coldest, busiest stretch of the year.

3. Winter timing costs you options, not just comfort

A furnace almost never fails on a mild afternoon — it quits during the first hard cold snap, when every HVAC company in the valley is slammed and you have the least leverage. Replacing an aging system on your own schedule this fall means you choose the equipment, compare quotes calmly, and avoid an emergency swap where availability and timing dictate the decision for you. If your furnace is 15-plus years old and showing symptoms, our guide to the signs a furnace needs replacing before winter is worth a read before the temperature drops.

4. Business owners still have a genuine December 31 deadline

Here's the part that didn't change. The residential 25C credit is gone, but the business tax rules are separate — and for commercial property they can be significant. Commercial HVAC equipment placed in service by December 31 can often be expensed or depreciated under Section 179 and bonus depreciation, which makes year-end a real deadline for a business replacing rooftop units or a VRF system. The equipment generally has to be installed and operational by December 31 to count for that tax year, so a December install has to actually finish in December. Limits and eligibility vary by business, so confirm the specifics with your CPA — then see our commercial HVAC fall maintenance guide for how we schedule work around your operations.

The Utah year-end HVAC checklist

Here's the practical, step-by-step version — the same order we'd walk a customer through if they called the office in November wanting to close out a project before the new year.

1. Confirm your utilities. Check your bills. Rocky Mountain Power handles your electric service and runs Wattsmart; Enbridge Gas (formerly Dominion Energy) handles natural gas and runs ThermWise. Many Northern Utah homes have both, which means you may qualify for rebates from each program.
2. Match the rebate to the system you're considering. A heat pump points you toward the Wattsmart rebate; a high-efficiency gas furnace points you toward ThermWise. See the two tables below.
3. Get sized and quoted now. A right-sized system is the single biggest factor in comfort and efficiency. Request a quote so we can measure the home, not guess from square footage.
4. Schedule the install with your deadline in mind. Homeowners: install whenever the timing and the current rebate work for you. Business owners: if you want the deduction on this tax year, the system has to be operational by December 31.
5. File the rebate paperwork on time. Wattsmart within about 90 days; ThermWise postmarked within six months. We help our customers complete these so nothing lapses.
6. Keep your documents. Hold onto the itemized invoice, the equipment model numbers, and any AHRI or manufacturer certification. You'll need them for the rebate — and, for a business, for your accountant.

Rocky Mountain Power Wattsmart (electric)

If a heat pump is on your list, this is the biggest single rebate available to Utah homeowners in 2026:

Ductless rebates are tiered: roughly $600 when the mini-split supplements existing gas heat (where most Utah homes land), up to $1,700 when it replaces electric-resistance heat. Actual amounts depend on the equipment's efficiency and your configuration, and applications go through the Wattsmart portal at rockymountainpower.net. For the full breakdown, see our complete 2026 guide to Utah heat pump rebates.

Enbridge Gas ThermWise (natural gas)

Staying with a high-efficiency gas furnace? ThermWise pays a rebate based on the furnace's AFUE rating, plus rebates on smart thermostats, high-efficiency water heaters, and weatherization measures like attic insulation and air sealing:

ThermWise rebates are paid for up to two high-efficiency furnaces per dwelling, and the request must be postmarked within six months of installation. Amounts change over time, so confirm the current offer at thermwise.com or the ThermWise hotline at 1-877-932-0610 before you buy.

What about the federal Home Energy Rebates (HEAR)?

You may have read about large federal Home Energy Rebates — the HEAR and HOMES programs — that promised up to $8,000 toward a heat pump for income-qualified households. Utah's Office of Energy Development was approved for this funding, but because of federal funding changes the program is not currently available to Utah homeowners. We keep an eye on its status and will help eligible customers apply if it launches. For now, don't build your year-end plan around it — plan around the Wattsmart and ThermWise rebates above, which are real and active today.

Know what you're installing before you commit

The rebate is the reward; the right system is the decision. A little reading now saves an expensive mistake later:

• For real 2026 price ranges by system type, see our Utah HVAC replacement cost guide.
• Torn between a heat pump and a new AC-plus-furnace setup? Our 10-year cost comparison for Utah homes runs the numbers, rebates included.
• Need to spread the cost over monthly payments? Our Utah HVAC financing guide shows how to stack financing with a rebate.

When you're ready, our team will size the system correctly, quote it upfront, and point you to every incentive you qualify for — across our heat pump, furnace installation, and commercial HVAC services.

How Salmon HVAC helps you close it out before December 31

1. Get a quote. Request a free quote or call (801) 397-0030 so we can size the right system and give you an upfront price.
2. Pick the incentive path. We'll tell you whether the Wattsmart heat-pump rebate or a ThermWise furnace rebate fits your project — and, for businesses, flag the Section 179 timing for your CPA.
3. Schedule the install. We coordinate the work around your calendar and, for commercial projects, around your operations so it's operational when it needs to be.
4. File the paperwork. We help complete the Rocky Mountain Power or Enbridge Gas rebate application so it's submitted inside the deadline.

Have questions before you decide? Send us a message or call the office — we'll walk through your options with no pressure.

Beat Winter, Not a Fake Deadline.

Salmon HVAC has kept Northern Utah comfortable since 1979. Get an honest quote, install on your schedule, and claim every rebate you qualify for before year-end.

Frequently Asked Questions

Is there a December 31, 2026 HVAC tax credit deadline?

No. The federal 25C Energy Efficient Home Improvement Credit — which used to give homeowners up to $2,000 for a heat pump and up to $600 for a high-efficiency furnace or AC — expired for equipment placed in service after December 31, 2025 under the One Big Beautiful Bill Act. A system installed in 2026 does not qualify for a federal HVAC tax credit, so there is no year-end federal deadline to race in 2026. If you installed qualifying equipment on or before December 31, 2025, you may still claim the credit on your 2025 tax return; confirm with a tax professional.

What HVAC rebates can Utah homeowners still get before the end of 2026?

Utility rebates are still active. Rocky Mountain Power's Wattsmart Homes program offers up to $1,700 for a qualifying air-source heat pump and up to $2,000 for a dual-fuel, ductless, or ground-source heat pump, plus up to $100 for a smart thermostat. Enbridge Gas (formerly Dominion Energy) ThermWise pays $300 for a 95–97.4% AFUE gas furnace and $350 for a 97.5%+ AFUE furnace with an ECM motor, plus rebates on smart thermostats and high-efficiency water heaters. Amounts can change with each program year, so lock in the current offer.

Do I have to install by December 31 to get a Utah utility rebate?

Not because of a hard December 31 cutoff — Wattsmart and ThermWise run year-round. But timing still matters for two real reasons. First, utilities revise their rebate amounts and qualifying rules with each program year, so the offer you see today is not guaranteed in January. Second, rebate paperwork deadlines run from your install date: Wattsmart applications are typically due within about 90 days, and ThermWise requests must be postmarked within six months. Installing before year-end locks in the current rebate and keeps your filing window open.

Can a Utah business still deduct a new commercial HVAC system at year-end?

Often, yes — the business tax rules are separate from the residential 25C credit that expired. Commercial HVAC equipment placed in service by December 31 can frequently be expensed or depreciated under Section 179 and bonus depreciation, which can make year-end a genuine deadline for business owners. The equipment generally must be installed and operational by December 31 to count for that tax year. Every business's situation is different, so confirm eligibility and limits with your CPA or tax advisor before you rely on it.

How long do I have to file for a Wattsmart or ThermWise rebate after installation?

For Rocky Mountain Power Wattsmart Homes, applications are typically submitted within about 90 days of installation through the Wattsmart portal. For Enbridge Gas ThermWise, the rebate request must be postmarked within six months of the installation date. Because these windows start on your install date, the sooner you install, the more time you have to gather your invoice, model numbers, and certification documents and file. Salmon HVAC helps customers complete this paperwork so a rebate doesn't slip through the cracks.