Innovative internal storm windows.

Defective and energy inefficient windows, such as single-pane windows, can be responsible for up to 70% of a home's heating and cooling load. An innovative internal storm window system designed to reduce energy loss through single-pane windows was field tested in three occupied homes in the southeastern part of the United States to demonstrate its energy savings impact. The test results indicated that this system, called the "Winsulator" system, reduced window-related energy consumption for heating and cooling by 29%. The technology was also tested to determine its impact on other factors, such as noise level and condensation. These results were also positive. The "Winsulator" system received the Window Energy Systems seal of certification for superior window performance from the Tennessee Valley Authority.