In 1995, about three-quarters of the schools in the U.S. were built before 1970. When the U.S. General Accounting Office released this information in a report; it added that nearly 60 percent of school buildings had unsatisfactory environmental conditions. A growing number of studies throughout the decades have found that conditions within school buildings have a significant impact on teachers and students. Because facility quality is a predictor of student health and learning, as well as teacher retention, more schools are upgrading their comfort systems and looking to temporary climate control and building layup services to maintain the health of their buildings.