Energy Efficient Home Improvement Credit

The credit that rewards spreading the work out

The Energy Efficient Home Improvement Credit, found in Section 25C of the tax code and claimed on IRS Form 5695, gives back 30 percent of what you spend on qualifying upgrades to your existing home. The catch that defines the whole strategy is the cap structure. There is a general annual limit of $1,200 that covers insulation, exterior windows, doors, and most efficiency equipment, with sub-limits inside it. Heat pumps, heat pump water heaters, and biomass stoves sit in a separate bucket with its own $2,000 annual limit. Both limits reset every January, which turns the credit into an annual allowance rather than a one-time windfall.

This calculator is for a homeowner planning energy upgrades who wants to see how much of the 30 percent actually survives the caps. Enter what you expect to spend by category and it applies each sub-limit, sums the general items, trims them to $1,200, and adds the heat pump credit on top.

A $16,500 renovation, and where the caps bite

Suppose you spend $2,000 on insulation, $5,000 on windows, $1,500 on doors, and $8,000 on a heat pump in a single year. At 30 percent the raw credits would be $600, $1,500, $450, and $2,400. But the windows have their own $600 annual ceiling, so the $1,500 is trimmed to $600. The doors are under their $500 sub-limit, so the $450 stands. Add the three general items, $600 plus $600 plus $450, and you get $1,650, which then runs into the overall $1,200 general cap and is trimmed again. The heat pump credit of $2,400 is capped at its own $2,000 limit. The total credit is $1,200 plus $2,000, or $3,200, even though your uncapped 30 percent would have been $4,950.

Two ways to leave money on the table

Because the caps reset annually, the most common planning mistake is bunching every project into one tax year. Split the work across two years and the example above could capture $1,200 of general credit in each year instead of one. The second pitfall is the credit's nonrefundable nature. Section 25C can reduce your tax to zero but it will not generate a refund beyond what you owe, and unlike the residential clean energy credit it does not carry forward. If your tax liability is small, time the improvements for a year when you owe enough to absorb the credit.

Keep in mind this is a different credit from the solar and battery incentive under Section 25D, which is 30 percent with no annual dollar cap and does carry forward. You can claim both in the same year. Also note that starting with 2025 placements, the IRS requires a product identification number for many qualifying items, so save the manufacturer documentation along with your receipts.

Section 25C questions worth clearing up

Does a home energy audit qualify for the credit?

Yes. A qualifying home energy audit conducted by a certified auditor earns a credit of 30 percent of the cost up to $150 per year, and it counts inside the general $1,200 limit. It is a low-cost way to use part of the allowance and identify which upgrades will pay off most.

Can a landlord claim this on a rental property?

Generally no. Section 25C is for improvements to a home you use as a residence, and a property you rent to others does not qualify for most items. A home you live in part of the year can qualify, and some equipment in a home you partly rent may be prorated, but pure rental units fall outside this credit.

Do labor costs count toward the credit?

It depends on the item. For heat pumps, heat pump water heaters, biomass stoves, and central air conditioners, the cost of professional installation counts toward the credit. For the building envelope items, insulation, windows, doors, and air sealing, only the cost of the materials qualifies, so the labor to install new windows is excluded. That distinction can shift which projects deliver the most credit per dollar spent.

What qualifies for the general $1,200 credit?

The general $1,200 annual credit covers building envelope and efficiency improvements to your existing primary or secondary residence. Qualifying items include air sealing insulation (batts, blown-in, spray foam), exterior doors (up to $250 per door, $500 total), exterior windows and skylights (up to $600 total), and qualifying home energy audits conducted by a certified assessor (up to $150). Central air conditioners, natural gas furnaces, boilers, and water heaters also fall under this $1,200 umbrella, and starting with 2025 installations the IRS requires a manufacturer product identification number for most of these items, so save the product documentation before you file.

Does the $2,000 heat pump credit stack with the $1,200 general credit?

Yes, they stack. The heat pump credit (covering heat pumps, heat pump water heaters, and biomass stoves) sits in its own bucket with a separate $2,000 annual limit and does not reduce the $1,200 available for general improvements. A homeowner who maxes out both in the same year can receive up to $3,200 in total Section 25C credits. The two categories are independent, so spending more on a heat pump has no effect on the credit available for insulation, windows, or doors in that same year.

Can you claim the credit in more than one year?

Yes. Unlike the old lifetime cap that applied before 2023, the current $1,200 general limit and $2,000 heat pump limit reset at the start of each tax year. That means you can claim the maximum credit in 2025, again in 2026, and so on as long as you install additional qualifying improvements each year. Intentionally spreading a renovation across two or three tax years, rather than completing everything at once, lets you capture the full annual allowance in each year instead of leaving part of the credit unused because of the cap. The heat pump credit also resets annually and can be claimed again in any year you install another qualifying system.