Compare the quality of GrandView™ 3000 windows to other similarly priced windows and you’ll find no better window value. Manufactured by Great Lakes^® Window, these windows have been tested and certified by independent industry organizations including the Window & Door Manufacturers Association and the National Fenestration Rating Council. Not to mention that units with optional multilayer, vacuum-deposition, soft-coat Low-E glass have earned the ENERGY STAR^® for meeting the strict energy efficiency guidlines set by the EPA and U.S. Department of Energy.