Numerous U.S. buildings have single-pane windows that do not insulate the building or its occupants as well as double-pane units or other advanced windows. Single-pane windows are also inferior in condensation resistance and occupant comfort. However, complete replacement of single-pane windows with efficient, modern windows is not always desirable or feasible due to cost, changes in appearance, and other concerns. Retrofitting, rather than replacing, single-pane windows can reduce heat loss and save roughly the amount of electricity needed to power 32 million U.S. homes each year. Transparent adhesive products that can be applied directly onto existing windows could improve window energy efficiency and other important qualities without substantially affecting the window’s appearance.
Project Innovation + Advantages:
SRI International, in collaboration with its partners will develop a transparent, adhesive film that can be easily applied to single-pane windows to reduce heat loss from warm rooms during cold weather. The team proposes an entirely new approach to thermal barriers and will develop a new class of non-porous materials that use nanoparticles to reflect heat and provide superior thermal insulation. Moreover, the transparent film does not block visible light, meaning that the coating allows light to transmit through the window and brighten the interior. The film could also improve the soundproofing of the window.
If successful, SRI’s innovations will enable energy-efficient retrofits for the substantial remaining stock of single-pane windows in the United States. Retrofitting single-pane windows could produce significant economic and environmental benefits. These technologies could help reduce building energy consumption and save money for homeowners and businesses. Consumers adopting these retrofits could also benefit from improved window performance, including greater comfort and condensation resistance in cold weather and better soundproofing. Finally, by consuming less electricity, natural gas, and/or heating oil to warm a building, these technologies reduce the greenhouse gas emissions associated with using these energy sources.