Introduction and Overview

Windows are one of the most significant elements in the design of any building. Whether there are relatively small punched openings in the facade or a completely glazed curtain wall, windows are usually a dominant feature of the building's exterior appearance. Windows can appear highly reflective, darkly opaque, or transparent, revealing or hiding activity within the building. Their color, transparency, and reflected patterns can change with the time of day and weather.

The Importance of Windows »

Issues in Design Selection »

Window Materials & Assemblies »

This web was developed with support from the U.S. Department of Energy's Windows and Glazing Research Program within the Energy Efficiency and Renewable Energy Building Technologies Program. In partnership with the building industry, the U.S. Department of Energy supports a range of research, development, and demonstration programs, as well as education and market transformation projects, designed to accelerate the introduction and use of new energy-saving building technologies.

This web site was jointly developed between the Center for Sustainable Building Research a the University of Minnesota and Lawrence Berkeley National Laboratory.