Yet another state-of-the-art technology comes integrated with Sears Weatherbeater windows and other high-efficiency models. It didn't exist for previous generations, but today, window glass often features a micro-thin coating of metal oxide. Commonly known as low-E, the coating blocks out solar heat gain in the summer, while preventing the escape of heat energy in the winter. That's not all, though. In addition to limiting heat transmission, low-E also filters the bleaching effects of ultraviolet light. In so doing, it protects your upholstered furniture, fabric floor coverings, and wall-hung artwork from fading over time. Jim Eldredge of Sears Home Services calls it "sunscreen for your house."