Insulate your attic, seal air leaks, and claim up to $1,200 in federal tax credits. It's among the fastest-payback home improvements available — and HomeShark shows you exactly what you qualify for.
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The 25C credit covers a broad range of air sealing and insulation materials. Here's the breakdown.
Heat rises. In an under-insulated home, 25–40% of heating and cooling energy escapes through the attic. Adding R-38 to R-60 insulation in the attic can cut that loss by 80%, reducing your annual heating and cooling bill by $200–$400 in most climates.
The average American home has enough air leaks to equal a 2-square-foot hole in the wall. Sealing these leaks with caulk, spray foam, and weatherstripping is the cheapest, fastest way to lower your energy bill — often with a payback under 1 year before counting the federal credit.
A blower door test (included in a professional energy audit) identifies exactly where your home leaks air. HomeShark's free report shows your estimated air sealing opportunity and the contractors in your area who offer blower door tests.
No technician visit. No lengthy forms. HomeShark does the work of a $500 professional audit in under two minutes.
We pull your home's public property record — square footage, year built, roof type, HVAC age, and solar potential — automatically.
Drop in a photo or PDF of any bill. Our AI reads your exact kWh usage, costs, and provider — making your report 3× more accurate.
Receive a personalized efficiency score, neighbor comparison, itemized savings opportunities, and every federal and state rebate you qualify for.
Request free quotes from 3 vetted local installers for solar, HVAC, EV chargers, and more. They compete — you choose the best price.
"I had no idea I qualified for a $6,600 solar credit plus another $2,500 from Austin Energy. HomeShark took 3 minutes and I'm now saving $187 every month."
"The neighbor comparison was eye-opening — I was using 34% more electricity than similar houses. The insulation upgrade paid for itself in under two years."
"I uploaded my electric bill photo and within 2 minutes had a full report showing $9,200 in available credits. The contractor match was seamless."
Attic insulation, exterior wall insulation, floor/crawlspace insulation, and air sealing (weatherstripping, caulking, spray foam for air barriers) all qualify under IRC 25C, subject to IECC 2021 standards.
Claim the credit on IRS Form 5695, Part II. You'll need a product certification statement from the manufacturer confirming the material meets IRS standards. Keep your receipts and contractor invoices.
Yes — the $1,200 is an annual aggregate cap across all 25C improvements (insulation, windows, doors, HVAC). However, heat pumps have a separate $2,000 cap. You can claim insulation + windows + heat pump in the same year.
Air sealing and attic insulation consistently rank as the highest ROI improvements — with payback periods of 1–3 years in most climates. The federal credit brings the effective cost down further.
Yes — studies show proper insulation increases home resale value by 2–3%. More importantly, it immediately improves comfort and reduces HVAC runtime, extending equipment life.
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