Design/build and renovation/restoration industry professionals are finding ways to keep pace with consumer demands for improved energy efficiency, safety and aesthetic appeal of their buildings. Additionally, a rise in demand for sustainable design, including reducing dependence on artificial lighting, has spurred interest in new window film technologies. Given trends toward expansive fenestration, an overall understanding of window films is essential to stay current with new technologies that provide creative opportunities and solutions for issues inherent with utilizing massive sheets of glass in architecture.