A sustainable design process is intended to produce high-performance buildings that are energy-efficient, healthy, economical, and use resources wisely to minimize the impact on the environment.

Properly designed windows play an important role in achieving these energy and environmental goals and contribute to the comfort, satisfaction, and productivity of building occupants.

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Designing facades and selecting windows in commercial buildings is challenging because it is necessary to balance many often competing issues and criteria. This web site provides critical information and performance data on the energy efficiency, interior environment, and technical considerations that influence window design decisions.

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This web site is sponsored by the U.S. Department of Energy, Energy Efficiency & Renewable Energy, Building Technologies Program.

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