If you own a home in Lakewood, Southlake, or Frisco and you’ve been putting off spray foam insulation because of the upfront cost, 2024 might be the year you actually do the math. The Inflation Reduction Act didn’t just extend the old 25C tax credit — it rewrote it. The credit was 30% of your project cost, up to $1,200 per year, and it was set to run through 2032. For a lot of DFW homeowners, that changed the conversation — but the 25C credit expired at the end of 2025 and is no longer available.

Here’s what you need to know about what was possible under the credit, and what may still be available through utility programs.

What the 25C credit actually covered

The 25C energy efficiency credit applied to insulation materials installed in your primary residence. That included spray foam, batt insulation, and rigid foam board, but spray foam tended to make the most sense for DFW homes because it seals the building envelope against both heat infiltration in July and cold snaps like the February 2021 freeze event that knocked out heat for millions of North Texans.

The credit was 30% of the cost of the insulation materials, capped at $1,200 per year. That cap reset every tax year, so if your project was large enough to split across two calendar years, you could potentially claim it twice.

A typical spray foam job in the DFW metro — attic, crawl space, or rim joists — runs $4,000 to $8,000 depending on square footage and access. At $6,000, your federal credit would have been $1,800. The credit directly reduced what you owed the IRS, dollar for dollar. It was not a deduction.

What qualified and what didn’t

Closed-cell spray foam requirements

For closed-cell spray foam to qualify under 25C, the product had to achieve a minimum R-10. Most two-pound closed-cell foam installed at standard thickness (2 to 3 inches) cleared this threshold easily. Your contractor should have been able to provide the product spec sheet, which showed the R-value per inch along with the manufacturer name and model number. You would have needed that document for your records when you filed.

Open-cell foam could qualify too, but it required greater thickness to reach the R-value thresholds, and the IRS had been consistent that the product itself had to meet the specification — not just the system as a whole.

What didn’t qualify

Labor costs alone didn’t qualify. Before it expired at the end of 2025, the 25C credit applied to the cost of qualifying insulation materials. If a contractor invoiced you separately for materials and labor, only the materials portion counted toward the 30% calculation. Ask for a line-itemed invoice. In DFW, where labor rates varied widely between a crew in Garland versus one in Plano, this distinction could have actually affected your credit amount by several hundred dollars.

Also: the credit applied to your primary residence only. An investment property or vacation home didn’t qualify under 25C.

How to claim it on your taxes

IRS Form 5695

While the credit was still available (it expired December 31, 2025), you would have filed Form 5695 — Residential Energy Credits — with your federal return. Part I of the form covered the nonbusiness energy property credit, which was the 25C credit for insulation. The math was straightforward: enter your qualifying material costs, calculate 30%, and carry the result to Schedule 3 of your 1040.

Documentation to keep

Your contractor needed to give you two things: an itemized invoice showing material costs separately from labor, and the product specification sheet for the spray foam product installed. The spec sheet needed to show the R-value, the manufacturer, and the product name or model number. The IRS didn’t require you to submit these with your return, but you should have kept them for at least three years in case of audit.

If your contractor didn’t provide a product spec sheet without being asked, ask for it before they left the job site. DFW crews did this work every day, and any crew that regularly serviced homes in North Texas knew homeowners were asking about the tax credit.

Stacking the 25C credit with Oncor rebates

Here’s where DFW homeowners had an edge that most of the country didn’t. Oncor — the electric transmission and distribution utility that serves most of Dallas County, Tarrant County, and surrounding areas — ran its own energy efficiency rebate program. For qualifying insulation improvements in Oncor’s service territory, rebates historically ranged from $0.10 to $0.20 per square foot of attic floor area treated, depending on the program year.

The important detail: the Oncor rebate did not reduce your 25C credit. The IRS required you to subtract any rebates received from your basis when calculating the credit — but only if the rebate was considered a purchase price reduction. Utility rebates from Oncor generally didn’t meet that definition and were instead treated as a reduction in your tax basis for the home, which had minimal practical effect for most homeowners who weren’t selling soon.

That said, tax treatment of utility rebates was a genuine gray area. Run your specific situation by a CPA before filing, especially if your Oncor rebate was substantial.

The short version: you could realistically receive the Oncor rebate and claim the 25C credit in the same tax year. For a DFW attic project, that combination could have knocked $1,500 to $2,500 off your total out-of-pocket cost.

The annual cap worked in your favor if you planned ahead

One detail most homeowners missed: the $1,200 cap was per year, not per project. If you were planning a larger renovation — spray foam in the attic this fall, air sealing and additional insulation in the spring — you could structure the work across two tax years and potentially claim up to $2,400 total. In a housing market like Trophy Club or Allen where homes often ran 2,500 to 4,000 square feet and attic jobs alone could exceed $5,000, that planning paid off.

FAQ

Does the 25C credit apply to spray foam installed in a detached garage in Colleyville?

No. The 25C credit applied only to your primary residence. A detached garage, even if attached by a breezeway, typically didn’t qualify. An attached garage where spray foam was installed on shared walls with living space may have partially qualified — but document it carefully and consult a tax professional.

I bought a newly built home in Celina last year. Can I claim 25C for insulation that was installed during construction?

Generally, no. The 25C credit was for improvements made to an existing home that you already owned. New construction insulation installed by the builder before closing didn’t qualify. If you added spray foam after purchase, that was a different story.

Oncor sent me a rebate check after my project. Does that affect my credit?

Probably not in a meaningful way for the current tax year. The IRS’s position was that utility rebates reduced your tax basis in the home rather than directly reducing your eligible credit amount. The practical impact was minimal unless you were selling the home soon. Worth flagging to your CPA, but it wasn’t a reason to skip claiming 25C.

My contractor in Fort Worth gave me one invoice with a single total. Can I still claim the credit?

You could try to get a corrected, itemized invoice before you filed. If the contractor was unable or unwilling to provide one, you may still have been able to estimate the material cost based on the product specs and square footage — but document your methodology. A single lump-sum invoice without a materials breakout was the most common reason DFW homeowners left money on the table with this credit.