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ENERGY STAR qualified windows meet a stringent energy efficiency specification set by the Department of Energy (DOE) and have been tested and certified by the National Fenestration Rating Council (NFRC). NFRC is an independent, third-party certification agency that assigns specific energy efficiency measures such as U-factor and Solar Heat Gain Coefficient (SHGC) to the complete window system, not simply the glass.
ENERGY STAR qualifications are based on U-factor and SHGC ratings for each of four different climate zones. To meet the U-factor and SHGC levels, window manufacturers often use double paned or triple paned glass, warm-edge spacers and Low-E coatings. To be ENERGY STAR qualified, DOE requires the window to meet the efficiency standard for the climate zone where it will be used. However, it is up to the manufacturer to determine how to accomplish that. 
For more information, call us toll-free at (800) 259-7580 or visit the U.S. Department of
Energy's
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| Corporate Headquarters & Manufacturing Plant 12805 E. 31st Street • Tulsa, Oklahoma USA 74146 Tel (918) 663-7580 • Fax (918) 627-3049 (800) 259-7580 • Hours: Mon-Fri 8a-6p / Sat 9a-1p |
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