Windows with two layers of glass separated by a sealed air space, providing better insulation than single-pane windows.
The space between panes is typically filled with argon or krypton gas for improved insulation. Seal failure allows moisture between panes, appearing as condensation or fogging. Double-pane windows are standard for energy efficiency in new construction.
Related searches: double pane windows, dual pane, insulated glass
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Glass with a thin metallic coating that reflects heat while allowing visible light through, improving window energy efficiency.
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.