Performance Outcomes

Energy Peak Demand Carbon Emissions Daylight Glare Thermal Comfort View Costs

Windows can have a significant impact on building operating costs, health, productivity and occupant well-being. Although appearance is important in architectural design, the traditional purpose of windows was to provide light, view, and fresh air for the occupants. As completely sealed, mechanically ventilated, and electrically lit commercial buildings have become the norm in the last half of the twentieth century, the role of the window in addressing occupant needs has declined. However, there is a growing recognition that the benefits of windows are valuable and contribute to the satisfaction, health, and productivity of building occupants. In addition to the trend toward more human-centered design, there is an urgent need for significant improvements in building energy performance.

Energy Use

Peak Demand

Carbon Emissions

Access to Daylight



Thermal Comfort



Facade Design Tool



Window Technologies

Case Studies

Tools & Resources