What is “Low-E” glass and do I need it?
Low-E, or low emissive glass, is a higher performing glass than clear glass. Low-E is a special coating used on one of the inside surfaces of a double pane glass unit. It will reduce radiant heat transfer for better overall insulation; it reduces heat from direct sunlight like tinted glass without heavy darkening, and greatly reduces UV infiltration to protect floors and furnishings. Depending upon the individual window’s exposure to sunlight, as well as the local climate and insulation requirements, Low-E glass is usually a good choice. You will lose a little more light and there will also be a negligible grayish-green hue in the glass.
