Insulation and Air Sealing

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Insulation and air sealing usually pay back faster than any other upgrade, and they shrink the solar, battery or heat pump you need. Seal air leaks first (attic, rim joists, plumbing and wiring holes), then add insulation to the R-value ENERGY STAR recommends for your zone. The FTC R-Value Rule makes sellers state tested R-values, so compare those, not marketing claims. A home energy audit with a blower door test (RESNET or BPI) finds the leaks you can't see. The federal 25C credit ended after 2025; check DSIRE for rebates. Makers below are commercial.

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Links last checked Oct 19, 2026.

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How much insulation, and air sealing (start here)
basc.pnnl.gov - DOE Building America Solution Center whois history safety search AI Mode Grok Bing AI
dsireusa.org - DSIRE: state and utility rebates whois history safety search AI Mode Grok Bing AI
ecfr.gov - 16 CFR Part 460: the R-value rule text whois history safety search AI Mode Grok Bing AI
energy.gov - DOE: consumer guide to air sealing (PDF) whois history safety search AI Mode Grok Bing AI
energy.gov (upgrades) - DOE Energy Savings Hub: insulation and air sealing upgrades whois history safety search AI Mode Grok Bing AI
energystar.gov - ENERGY STAR: seal and insulate whois history safety search AI Mode Grok Bing AI
energystar.gov (r-values) - ENERGY STAR: recommended R-values and zone map whois history safety search AI Mode Grok Bing AI
energystar.gov (tax) - ENERGY STAR: federal tax credits (25C ended after 2025) whois history safety search AI Mode Grok Bing AI
ftc.gov - FTC R-Value Rule: sellers must show tested R-values whois history safety search AI Mode Grok Bing AI
Home energy audits
bpi.org - Building Performance Institute: certified auditors whois history safety search AI Mode Grok Bing AI
resnet.us - RESNET: find a HERS rater whois history safety search AI Mode Grok Bing AI
Insulation makers
insulationinstitute.org - Insulation Institute whois history safety search AI Mode Grok Bing AI
jm.com - Johns Manville whois history safety search AI Mode Grok Bing AI
knaufnorthamerica.com - Knauf Insulation whois history safety search AI Mode Grok Bing AI
owenscorning.com - Owens Corning insulation whois history safety search AI Mode Grok Bing AI
reflectixinc.com - Reflectix whois history safety search AI Mode Grok Bing AI
rockwool.com - ROCKWOOL mineral wool whois history safety search AI Mode Grok Bing AI
Supplies
amazon.com - Amazon: weatherstripping whois history safety search AI Mode Grok Bing AI
amazon.com (foam) - Amazon: spray foam sealant whois history safety search AI Mode Grok Bing AI
dap.com - DAP caulks and sealants whois history safety search AI Mode Grok Bing AI


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Number of links: 20