Building Envelope Solutions (BES) provides world class energy efficiency services for corporate, university, and government facilities. BES is the leading provider of commercial weatherization to the American ESCO market, completing projects in 45 states last year. BES is best known for driving down energy consumption by sealing gaps in building exteriors to reduce the unwanted flow of air through cracks, holes and gaps. It is also a leading installer of commercial window film, insulation, and window replacements. Sealing the building envelope improves overall building performance while providing health and safety benefits for the people who use the facility.