From the company: Indow window inserts are like custom storm windows but they are easier to install and use — they just press inside your window frames without a mounting bracket. Unlike most custom storm windows, our interior window inserts can easily be made to fit any shaped window, including arches, half rounds, and more. Indow window inserts give you all the comfort and energy efficiency of high-end replacement windows and are even better at blocking noise. Our mission is to provide you with comfort, quiet and savings while helping preserve the environment and historic buildings.
Office of Historic Preservation