Insulate Your Envelope,
Stop Thermal Leaks.
Free insulation calculators: how many batts or bags your attic needs, R-value from current depth, heating savings from an upgrade, and material cost comparisons. No sign-up.
Climate Zone R-Standards
Department of Energy targets (R-38 to R-60 attic) tailored to regional winter and summer loads.
Blown vs Batt Bags
Calculate settled thickness of blown cellulose vs fiberglass batts between 16" and 24" joists.
Payback & Energy Savings
Estimate HVAC heating and cooling reduction to project true return-on-investment timeline.
InsulPro Calculators
Attic R-Value Calculator
Current R-value from insulation depth and type — and how many inches of what get you to your climate-zone target.
Insulation Bag & Batts Calculator
Bags of blown-in or bundles of batts for your attic area — from manufacturer coverage charts, with waste margin.
Insulation Savings Calculator
Annual heating and cooling savings from an R-value upgrade — by climate, fuel, and your actual utility rates.
Insulation Cost Comparison
Batts vs blown cellulose vs spray foam for your area and target R — installed-cost estimates and cost per R point.
Building Code & Methodology
Whole-Wall R vs Cavity R: The Number the Sticker Hides
Your "R-19 walls" are really R-13 to R-15 — framing studs bridge every bay. The framing-factor math, and where to spend on insulation honestly.
Air Sealing Before Insulation: Why Order Changes the Numbers
Insulation slows conduction; air leaks ignore it. The attic's hidden holes, the sealing sequence, and why R60 over leaks disappoints.
Which Insulation Upgrade Pays Back First? A Payback Ladder
Attic, rim joist, walls, basement, windows — ranked by dollars saved per dollar spent, with the numbers behind the ranking.