Do Window Films cause seal failure when applied to insulated(double-pane) windows?
No, window films do not cause seal failures. We’ve been applying films to insulated windows for years with several thousand square feet of film applied to date. When recommended films are applied to the inside pane of insulated glass unit, there will be some absorption (except with clear safety films) of the sun’s energy, which will increase the temperature of the glass pane. Some of this heat will transmit to the airspace, slightly raising the airspace temperature. However, even a 20oF degree increase (unusual for most films) will result in a less than 3% change in air pressure, whereas properly made units are designed and tested to withstand 22% change in airspace pressure. Risk of seal failure is greatly determined by the quality of workmanship and the quality of the materials that go into the building the insulated glass units. The best guard against seal failure is to purchase well-made units from reputable window manufacturers that have solid experience and histories with insulat
