Oak Ridge National Laboratory's Buildings Technology Center is a "research facility devoted to the development of technologies that improve the energy efficiency and environmental compatibility of residential and commercial buildings." The state-of-the-art research and development facility houses about 50 staff and 10-20 guest researchers. The website describes the center's facilities, research capabilities, and research programs. Another section describes some of the tools for buildings that the center has developed, such as a heat pump design model, building envelope web-based calculators, and a computer program designed to determine the most cost-effective retrofit measures for single-family homes. Publications on topics such as envelope systems, appliance and equipment efficiency, Desiccant-related research and other research on building design and performance are posted online. An easy-to-browse database of success stories provides specifications, rendered and line drawings, and other facts about the Center's building technologies.