Do 3M Window Films cause seal failure when applied to insulated (double pane) windows?
No, 3M Window Films do not cause seal failure to insulated (double pane) windows. Accent Distributing and its network of highly trained and qualified 3M Window Film dealers have been applying commercial and residential window films to insulated windows for many years with several millions of square feet of window film applied to date.
When 3M Window Films are applied to the inside pane of an insulated glass unit by a certified 3M dealer, there is some absorption (except in the case of clear safety films) of the sun’s energy, which does slightly increase the temperature of the glass pane. Some of this heat transmits to the air space, slightly raising the temperature between the insulated layers of the window. However, even a 20 F degree increase (unusual for most films) will result in less than a 3% change in air pressure, well within the 22% change in air pressure which quality manufactured window units are designed and tested to withstand.
Risk of seal failure is greatly determined by the quality of workmanship and the quality of the materials that go into 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 insulated units.