PRODUCT GUIDE Interior Window Panels Photo: Indow Window Behind the recommendations Related articles Behind the recommendations Related articles Interior Window Panels These interior "storm windows" improve the thermal performance of existing windows and reduce air leakage. More about Interior Window Panels 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. 4 Resources Help Draw the Shades on Poor Window Performance 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. Historic Preservation and Green Building: A Lasting Relationship Getting the Most from Old Windows: A Tale of Attachments FTC Cracks Down on "Seriously" Exaggerated Window Claims Carbon and Financial Payback Mismatched in Retrofits Lighting, windows, or the chiller? Choosing a retrofit package is all the more tricky when dollar and carbon ROI are at odds. 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.