PRODUCT GUIDE Window Film An array of surface-applied films are designed for a variety of jobs: privacy, solar heat rejection, and even winter energy performance. Photo: Solutia Performance Films Behind the recommendations Related articles Behind the recommendations Related articles Window Film Surface-applied films with NFRC ratings and a ten-year warranty, plus seasonal flexible-film kits More about Window Film Making Windows Work Better How to choose curtains, solar screens, awnings, and storm windows? The options are dizzying, but the right choice can cut energy bills. Window Film: An Overlooked Retrofit Option? Improving Your Windows with Plastic Film Kits, Insulated Shades, and Interior Storm Windows It's easy to augment your existing windows to keep the heat in better, but some "window attachments" are better than others. Cost-Effective Window Attachments: A Practical Guide Twenty-Year Payback for Embodied Carbon of Triple-Glazed Windows It takes almost 20 years for triple-glazed windows to save enough energy to overcome their additional embodied carbon, according to a new study.