Solar Gard. In addition to many high-efficiency windows, some window films, such as Solar Gard solar control window films, also qualify for federal tax credits. Nearly invisible when applied, solar control window films allow homeowners to benefit from natural light while reducing total solar energy by up to 80%, the maker says. The films also reduce glare, UV exposure, and help eliminate window hot spots that affect interior temperatures. 877.273.4364. www.solargard.com.