Windows are usually the weakest point in a home's thermal envelope, and film is a way to improve them without replacing the glass. By reducing the solar energy entering through the glazing, film helps keep interiors cooler through the hotter months and makes temperatures more even from room to room, so cooling systems cycle less on the worst afternoons. The same films filter UV and cut glare, which makes the space easier to live in as well as easier to cool. How much difference you see depends on the film, the shade, the orientation of the windows and the glazing already in place, so it is worth having an installer look at the actual windows before you commit. Existing double glazing in particular should be identified first, since that affects which films are suitable.
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