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Look for the ENERGY STAR® Label, For Energy Savings ENERGY STAR®, a program created by the U.S. Department of Energy, helps consumers identify energy efficient windows and doors. Compared to other products, ENERGY STAR® windows are so efficient that they reduce heating and cooling costs for an average household by up to 15 percent every year.* ENERGY STAR® sets minimum performance requirements for windows to fit the needs of the four climate regions of the U.S.- northern, north/central, south/central, and southern. CertainTeed windows with the proprietary Thermaflect® Low "E" glass meet ENERGY STAR® guidelines in all four regions.
*These calculations are based on a 2400 sq.ft. two story frame house, with 432 sq.ft. of window area, R-19 walls, R-30 roof and equal distribution of glazing in the four cardinal directions.
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