We have installed 3M PR40EXT to the external side of this window. This is a North facing double glazed window in a board room. The problem prior to the film being applied was heat, so much so the air conditioning was always on. The Glare was also a factor.
Another requirement the client requested was a non-reflective surface on the outside. There's only one film that can reduce 80% of the heat without being reflective, 3M Prestige series.
*Allows high transmission of natural light into your home to provide excellent aesthetics.
*Multi-layer film rejects up to 97% of infrared light so you can enjoy energy savings and enhanced comfort.
*Low interior and exterior reflectivity lets you enjoy the views from inside while maintaining an attractive look from outside.
*Non-metallized window film lets you stay connected with mobile devices without interference and no chance for corrosion.