In some windows, the spacer in the window frame can be conductive, allowing energy to escape, so valuable heat energy is lost through the window. When Envirosealed windows and doors with non-metallic Duralite insulating glass spacers are used, the glass edge is up to 45 percent better insulated against energy loss, creating a higher performance thermal barrier and the lowest U-value available. http://envirosealedwindows.com
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