Many new homes are constructed with dual pane windows (also known as double-glazed windows or insulating windows). The two panes of glass are separated by a spacer up to 5/8 inch in thickness. The air space between the dual panes is “dead air.” This area is so tightly sealed that air can neither enter nor leave the space. By placing a tinting film on the inside of the window, the sun’s rays are reflected back into the dead air space. The temperature in this space can become so hot that it may cause the elastic seal to rupture, causing the insulating value of the window to be lost. Windows with broken or ruptured seals are easy to identify: they have moisture between the panes of glass. Homeowners should never tint a dual pane window on the inside unless it is specifically approved by the window manufacturer.
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