Glass with a thin metallic coating that reflects heat while allowing visible light through, improving window energy efficiency.
Low-E (low emissivity) coatings can be positioned differently for different climates—reflecting heat out in hot climates or reflecting it in for cold climates. Most modern energy-efficient windows include some form of Low-E coating.
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A measure of how well a window or door prevents heat transfer. Lower U-factors indicate better insulating performance.
A measure of how much solar radiation passes through a window—expressed as a number between 0 and 1.
Windows with two layers of glass separated by a sealed air space, providing better insulation than single-pane windows.