![]() ![]() Warm Edge Spacers: A spacer keeps a window's glass panes the correct distance apart. These odorless, colorless, non-toxic gases insulate better than regular air. Gas Fills: Some energy-efficient windows have argon, krypton, or other gases between the panes. They also reflect damaging ultraviolet light, which helps protect interior furnishings from fading. ![]() Low-E Glass: Special Coatings reflect infrared light, keeping heat inside in winter and outside in summer. Some ENERGY STAR-qualified windows include three or more panes for even greater energy-efficiency, increased impact resistance, and sound insulation. Multiple Panes: Two panes of glass, with an air or gas-filled space in the middle, insulate much better than a single pane of glass. Anatomy of an energy-efficient window: Quality Frame Materials: A variety of durable, low-maintenance framing materials reduce heat transfer and help insulate better. ![]()
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