ENERGY STAR helps you meet and exceed energy-efficient standards to make your building or renovation purchases easier and long-lasting. Learn how you can save money, energy and the environment with a simple window replacement.

Duralite Window Spacer The Duralite insulating glass spacer is a composite laminate design that optimizes the use of a number of spacer components--a warm edge polycarbonate spacer that traps air pockets between its corrugations, a 3-sided continuous foil moisture barrier that's impermeable to gas and water vapor, a moisture-resistant bondline adhesive and an encapsulated desiccant to keep your windows clear, longer, while increasing energy savings compared to other types of insulating glass spacers (available in black or gray).
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Window Performance Comparison Chart Many windows have spacer options, which can make a real difference in performance and comfort. The better the glass edge insulates, the less energy is lost, and the more comfortable it is near the window. As this chart shows, Envirosealed windows with Duralite warm-edge window spacers provide the best performance among available options, whether in new homebuilding or remodeling projects.
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