Laboratory and field studies sponsored by the U.S. Department of Energy, Bonneville Power Administration, and others demonstrate that the use of window attachments can lead to significant heating and cooling building energy savings. This report provides a summary of commercially available window attachments in the market and characterizes these attachments in terms of energy efficiency, savings potential, and other functional attributes applicable to the northwestern states of Washington, Oregon, Idaho, and Montana. A summary of the research findings related to window attachments and energy savings is provided.
