Abstract: The present invention concerns a new and improved storm window and window suspension arrangement for mounting a storm window frame in assembly with a frame of a window on a building. The storm window frame has a continuous annular resilient synthetic plastic spacer mounted on an inwardly facing surface of the frame for abutment against the frame carrying the window, and spring-loaded fasteners extend through the storm window frame for compressing the continuous annular resilient synthetic plastic spacer throughout its annular dimension and for securing the storm window frame in retained engagement with the window frame of the window, thus insuring a snug air-tight assemblage of the storm window on the window frame of the window. The storm window has an annular inwardly facing retaining groove with the synthetic plastic spacer being retainingly engaged and retained in the groove.