🏠 Illinois Insulation R-Value Calculator

Calculate optimal R-values and energy savings for insulation upgrades in Illinois Climate Zone 5. Includes spray foam, blown-in, and batt insulation comparisons with federal tax credits and utility rebates.

Your Home Details

Total conditioned square footage

Current Insulation Levels

Illinois code requires R-49
Illinois code requires R-20
Illinois code requires R-15

Planned Insulation Upgrade

Combined gas and electric
<div style="background: #fef2f2; border: 2px solid #dc2626; padding: 20px; border-radius: 8px; margin: 40px 0; text-align: center;"> <p style="font-size: 16px; font-weight: bold; font-style: italic; color: #dc2626; margin-bottom: 15px;"> ⚠️ IMPORTANT DISCLAIMER: Projected figures based on publicly available information as of July 2025 and subject to change. Do NOT rely on these financial projections alone, for updated and accurate data be sure and book a free consult with an Illinois Power Savings / Illinois Shines Program professional by clicking here right now. </p> <a href="https://api.leadconnectorhq.com/widget/booking/3aEEpkkNI3zvQcz2Lk4c" target="_blank" rel="noopener" style="display: inline-block; background: #dc2626; color: white; padding: 12px 24px; border-radius: 6px; text-decoration: none; font-weight: bold; font-size: 16px;"> Book Free Professional Consultation → </a> </div>