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Recommended insulation R-value
Target R-values by DOE climate zone, from the ENERGY STAR table.
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ENERGY STAR recommends attic and floor R-values by climate zone (zones 1 to 8). Find your zone on the DOE/IECC climate zone map.
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Related guide
Insulation & weatherization guide
Improve comfort and energy performance by choosing climate-appropriate insulation, air sealing, and moisture control for the whole home.