The 25C federal energy credit, explained by an installer
Up to $2,000 back on a qualifying heat pump install. Real 2026 numbers, eligibility, stacking with utility rebates, and what Watson provides for your tax return.
- What qualifies (and what doesn't)
- Real 2026 calculation on a typical NKY install
- Stacking with Duke Smartsaver + Owen Electric rebates
- Exactly what paperwork Watson hands you
30% of what you spend on a qualifying heat pump, up to $2,000 back.
Claimed on your federal tax return the year you install. Non-refundable (caps at your tax liability), no income limit, stacks with utility rebates. Equipment AND labor count. We hand you the AHRI certificate and itemized invoice; your tax preparer files a one-page IRS Form 5695.
The 25C eligibility checklist.
Seven yes/no questions. If you answer yes to all seven, your heat pump install is almost certainly eligible. If you answer no to any one, call us before writing a check.
- 01
You file a US federal tax return
The credit lives on your 1040. If you don't file federal taxes, there's nothing to credit against.
- 02
The home is your primary residence
Rental properties + second homes don't qualify under 25C. Primary residence = where you live most of the year. If you're renting out part of the house, the credit is prorated to your personal-use share.
- 03
The home is in the United States
Federal credit, federal program. Existing home or new construction you're moving into both qualify.
- 04
Equipment meets the efficiency tier
For heat pumps: CEE's highest tier above Energy Star (roughly HSPF2 ≥ 7.5 + SEER2 ≥ 15.2 for ducted; ductless mini-splits have a separate tier). We only quote equipment that qualifies.
- 05
Installed in tax year 2026 (or later)
Credit is claimed for the year the equipment is placed in service. A heat pump that runs for the first time on December 31, 2026 counts for 2026; one that first runs on January 2, 2027 counts for 2027.
- 06
You have enough federal tax liability
Non-refundable. If your total federal tax owed before credits is $1,400, you get $1,400 back (not $2,000). Most homeowners owe well over $2,000, so this rarely bites.
- 07
You keep the AHRI certificate
Proves the installed equipment meets the efficiency tier. We provide it on every heat pump install. Your tax preparer attaches the info to Form 5695.
Equipment-by-equipment breakdown.
Not all HVAC upgrades are created equal for tax purposes. Here’s what falls under which cap.
| Equipment | Qualifies? | Annual cap | Notes |
|---|---|---|---|
| Air-source heat pump (ducted) | Yes | $2,000 / yr | CEE highest efficiency tier. Equipment + labor both count. Watson's heat pump conversions all qualify. |
| Ductless mini-split heat pump | Yes | $2,000 / yr | Same $2,000 annual cap as ducted heat pumps. Multi-zone systems roll up to one cap per year. |
| Heat pump water heater | Yes | $2,000 / yr (shared) | Shares the heat pump cap: if you install both a heat pump and a HPWH in the same year, combined credit is still capped at $2,000. |
| Gas furnace (high-efficiency) | Yes | $600 / yr | Separate $600 cap inside the $1,200 annual aggregate for other improvements. 2026 minimum: AFUE 97% natural gas / 95% propane. |
| Central AC (SEER2 15.2+) | Yes | $600 / yr | Included in the $1,200 aggregate. Labor does NOT count for AC, only equipment. Most AC-only replacements leave credit on the table vs. pairing with a heat pump. |
| Straight electric furnace or resistance heat | No | N/A | Not eligible. If you have resistance heat today, converting to a heat pump is the move, both for operating cost and for the credit. |
| Ductwork, humidifier, dehumidifier, IAQ | No | N/A | Not 25C-eligible as standalone items. Ductwork can sometimes be rolled into the heat-pump install cost if it's required for the system to function properly; ask your tax preparer. |
CEE highest efficiency tier. Equipment + labor both count. Watson's heat pump conversions all qualify.
Same $2,000 annual cap as ducted heat pumps. Multi-zone systems roll up to one cap per year.
Shares the heat pump cap: if you install both a heat pump and a HPWH in the same year, combined credit is still capped at $2,000.
Separate $600 cap inside the $1,200 annual aggregate for other improvements. 2026 minimum: AFUE 97% natural gas / 95% propane.
Included in the $1,200 aggregate. Labor does NOT count for AC, only equipment. Most AC-only replacements leave credit on the table vs. pairing with a heat pump.
Not eligible. If you have resistance heat today, converting to a heat pump is the move, both for operating cost and for the credit.
Not 25C-eligible as standalone items. Ductwork can sometimes be rolled into the heat-pump install cost if it's required for the system to function properly; ask your tax preparer.
A typical Northern Kentucky scenario.
Real numbers from a real recent conversion. Your quote will vary; this is the shape of the math, not a promise.
2,400 sqft home, existing 12-year-old AC + 8-year-old 80% furnace. Converting to a cold-climate heat pump + matching air handler + keeping the gas furnace as dual-fuel backup. Smart thermostat + electrical panel load check included.
25C isn’t the only money on the table.
Northern Kentucky utilities run their own rebate programs on qualifying heat pumps. They stack. You get both, and the utility rebate doesn’t reduce the 25C calculation.
30% of equipment + labor, heat pumps specifically. Claimed on your federal return. No income cap.
Rebate on qualifying high-efficiency heat pumps + central AC for Duke residential electric customers. Applied through Duke after install.
Rebates for qualifying heat pumps, available to Owen Electric members. We'll confirm your service territory before quoting.
Utility program details change quarterly. We confirm active rebates + eligibility as part of your quote and apply them before you finalize financing.
We provide the docs. You hand them to your tax preparer.
The 25C process is simpler than most homeowners expect. We do the technical + equipment-proof side; you do the tax-filing side. Between us, it’s a one-page form.
Included with every heat pump install Watson does, at no extra charge:
- AHRI Certificate of Product Rating
Manufacturer-issued proof that the equipment meets the CEE efficiency tier required for 25C. You'll need this if audited.
- Itemized invoice with labor broken out
Equipment line items, labor total, installation date, permits. Same document serves as proof of payment and proof of service.
- Manufacturer warranty registration
Registered in your name within 90 days (required to get the 10-year parts warranty). Separate from the tax credit but the same paperwork moment.
You (or your preparer) file IRS Form 5695.
It’s one page. Part II of the form covers the Energy Efficient Home Improvement Credit. You enter the equipment cost, the 30% calculation, and the credit amount. TurboTax and H&R Block both walk you through it automatically when you answer the “did you make energy improvements?” question.
IRS Form 5695 + instructionsQuestions homeowners ask about 25C.
- Can I claim the credit if I financed the installation?
- Yes. The 25C credit is based on total cost paid, regardless of whether you paid cash, financed through Hearth, used a HELOC, or stacked with a utility rebate. The year you claim it is the year the equipment is placed in service (typically install year), not when you finish paying the loan.
- What if my tax liability is less than $2,000?
- The 25C credit is non-refundable: it can only reduce your tax owed to zero, not below. If you owe $1,400 in federal tax and qualify for $2,000 in credit, you get a $1,400 reduction, not a $600 refund. The $600 does not carry forward to next year. Most middle-income homeowners owe well over $2,000 in federal tax, so this rarely binds, but it matters for lower-income or retired filers.
- Does the credit apply to installation labor?
- For heat pumps and heat pump water heaters, yes: both equipment AND labor count toward the 30% / $2,000 calculation. For other 25C-eligible improvements (insulation, windows, doors, furnaces), labor generally does not count. Heat pumps get the better treatment on purpose.
- Does a gas furnace qualify?
- Not under the heat pump line (that's the $2,000 cap). High-efficiency gas furnaces and gas boilers qualify for a separate $600 cap inside the $1,200 annual aggregate. Required minimum efficiency changes yearly; in 2026, gas furnaces must meet AFUE 97% (natural gas) or 95% (propane) to qualify. We'll confirm the model you're considering.
- Can I claim 25C every year?
- Yes. The annual caps reset every tax year. You could install a heat pump in 2026 ($2,000 credit), insulate your attic in 2027 ($1,200 annual cap for other improvements), install a heat pump water heater in 2028 ($2,000 credit), and claim each year separately. The credit is scheduled to run through 2032.
- What's the difference between 25C and 25D?
- 25C (what this guide is about) is the Energy Efficient Home Improvement Credit, which covers heat pumps, insulation, windows, etc., with annual caps. 25D is the Residential Clean Energy Credit, which covers solar panels, geothermal, battery storage, and has no annual cap (30% of total cost, uncapped, carryover allowed). They're independent, so you can claim both in the same year for different projects.
- Do you help with the tax filing itself?
- No. We're HVAC installers, not CPAs. What we do provide: the manufacturer's AHRI Certificate of Product Rating (proves the equipment meets the efficiency tier), an itemized invoice breaking out equipment vs. labor, and the installation date. Your tax preparer (or TurboTax / H&R Block) files IRS Form 5695 with your return. It's a one-page form.
- What if I move before the install year ends?
- The credit is claimed in the year the equipment is placed in service at your primary residence. If you install in March and sell the home in November, you still claim the credit on that year's return. The new owner can't claim it again for the same equipment. If you're installing on a home you're moving into later in the year, make sure it's designated your primary residence by year-end.
Quote a heat pump + put $2,000 back on your 2026 tax return.
Free in-home load + duct assessment. Written quote within 24 hours. We’ll confirm 25C eligibility + any stacking utility rebate before you commit.