About Energy Star Zen Windows is proud to offer our customers vinyl replacement windows and sliding glass patio doors with the ENERGY STAR label! All Window and Door products specified with Peak Performance Dual Pane Glass with Low-E and Argon or Super Peak Performance Triple Pane Glass with Low-E and Krypton are ENERGY STAR qualified in all 50 states. Zen Windows and patio doors are NFRC rated, certified and labeled for both U-factor ( heat loss ) and solar heat gain ( heat from sunlight. ) ENERGY STAR is a government-supported program developed to simplify purchasing decisions for consumers by assuring products meet or exceed strict energy efficiency criteria set by the U. S. Department of Energy. For more information, visit the ENERGY STAR website at www.energystar.gov Warm edge spacers, such as foam, that keep the panes separated without acting as a conductor to help fight heat loss and reduce condensation Argon or krypton gas fills between the panes provide better insulation. These gases are odorless, colorless, and non-toxic The energy performance of all ENERGY STAR qualified windows, doors, and skylights must be independently tested and certified according to test procedures established by the National Fenestration Rating Council ( NFRC ). NFRC is a third party, non-profit organization that sponsors certified rating and labeling programs to help consumers compare the energy and performance features of windows, doors, and skylights. NFRC's programs do not distinguish between "good" and "bad" windows, set minimum performance standards, or mandate performance levels. This is where ENERGY STAR comes in. ENERGY STAR enables consumers to easily identify NFRC-certified products with superior energy performance.

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