Costs & R-Value
Insulation Rebates and Tax Credits
The federal tax credit for insulation ended with 2025, but utility rebates, state programs and free weatherization still cover part or all of an attic job for many households.
Updated January 2026 · about 6 min read
Federal 25C credit: ended after 2025
The energy efficient home improvement credit (25C) paid 30% of the cost of qualifying insulation and air sealing materials, up to $1,200 a year. The One Big Beautiful Bill Act ended it: the credit applies only to property placed in service through December 31, 2025, so insulation installed in 2026 does not qualify (IRS: Energy Efficient Home Improvement Credit; IRS fact sheet FS-2025-05).
If your project was finished in 2025, you can still claim it on your 2025 return with Form 5695. Keep receipts that identify the product and its R-value.
State and utility rebates
Many gas and electric utilities offer attic and air-sealing rebates, paid per square foot or as a flat amount. Programs and amounts vary by utility and change often; most require a participating contractor and sometimes a pre-inspection or blower door test.
Some states run their own home energy rebate programs, often income-qualified, and availability varies by state and funding round. Check your state energy office before booking work.
Gear for this job
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Free weatherization
Income-qualified households can get insulation and air sealing at no cost through the federal Weatherization Assistance Program, administered locally. Waitlists are common but the work is thorough.
How to stack them
Apply for the utility rebate first (it often requires pre-approval), have the work done by their approved contractor if required, then stack any state program on what is left. For a project finished in 2025, the federal credit applies only to out-of-pocket material cost, never to money a rebate already reimbursed.
Run the numbers
Frequently asked questions
- Can I get a tax credit for DIY insulation?
- Not for work done in 2026. The federal 25C credit, which covered 30% of materials up to $1,200, only applies to improvements made through December 31, 2025. Some utility rebates do accept DIY work. Check the program rules before you buy materials.
- Does air sealing qualify?
- Under the federal 25C credit, caulk, canned foam, weatherstripping and house wrap counted as building envelope components, but only for property placed in service through December 31, 2025. For 2026 work, whether air sealing qualifies depends on your utility or state program; many include it.
- Do I need a contractor for utility rebates?
- Usually yes, and often from an approved list. Confirm before starting; work done first rarely qualifies retroactively.
Insulation gear worth owning
The tools and materials that show up on almost every insulation job.
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