Guardian_SunGuard_HERO(600)This low-E glass coating allows solar heat to enter and stay in a building, helping to improve the energy-efficiency of commercial projects in cool-weather climates. Suited for both new construction and retrofits, SunGuard Neutral 78/65 from Guardian Industries can be used in double- or triple-glazed units. Other features include high visible-light transmission (78%) and a high solar heat gain coefficient (.65), along with a neutral color appearance.