A measure of thermal resistance—how well a material prevents heat transfer. Higher R-values indicate better insulation.
Different climate zones have recommended R-values for walls, ceilings, and floors. California's Title 24 energy code specifies minimum requirements. Insulation materials vary in R-value per inch—spray foam offers more per inch than fiberglass batts.
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A measure of how well a window or door prevents heat transfer. Lower U-factors indicate better insulating performance.
Glass with a thin metallic coating that reflects heat while allowing visible light through, improving window energy efficiency.
Windows with two layers of glass separated by a sealed air space, providing better insulation than single-pane windows.