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This Top Innovation describes research by Building Science Corporation to determine that whole-house energy savings of up to 10% can be achieved through repair and rehabilitation of windows, potentially improving the energy efficiency of more than 5 million U.S. homes annually. The team developed a series of guides for homeowners and contractors that recommend various options for repairing or replacing old windows. The options include window sash repair, interior and exterior storm windows, and window rehabilitation and replacement.

The guides are available in the Building America Solution Center, an online resource of home construction how-to’s. Search for "retrofit windows" and filter for "Guides" under "Content Type." Read about this Top Innovation.

View other Top Innovations in the Effective Guidance and Tools category.