What is the difference between Low E4 glass and having glass with tinted window film? The tint that claims to have heat rejection/retention. Does window tint/film provide a comparable window efficiency?
Lo-E4 SmartSun glass, used in Renewal by Andersen replacement windows, is the most advanced glass Andersen has ever offered for energy efficiency. When comparing Lo-E4 to a tint or film, it's important to know which one we are comparing it against.
By definition, a tine is a coloring of the glass to darken the glass typically for solar relief purposed. A film, on the other hand, is a separate layer that is applied to the glass for the same objective, solar relief.
A film is specifically forbidden for use on a dual pane window, as it will void the manufacturer's warranty. This is because a film can only be used on a single pane window, this negating the benefits of the dual pane feature that offers exceptional energy efficiency.
A tint is designed only to darken the glass. While this reduces some infrared heat rays, and some ultra-violet light rays, the visible light is lost as well. In order to achieve the energy efficiency level of Andersen's Lo-E4, the tint would have to be severely dark, making it impractical in every day use since interior lights would be needed to keep the home lit during the day.
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