Abstract: A new Window Board system for offering a quick and easy way to insulate and fill a window opening. The inventive device includes an upper window insert end, a lower window insert end, and a compressive spring area. In use, the Window Board System (10) is compressed and fitted into a window frame (16) with the desired message (40) showing in the desired direction. The Window Board System (10) is placed into the window frame (16) when ever one desires to muffle noise, increase insulation value, or block out light. This can be done as often as one chooses, for example, put it in at night and take it out in the morning to make it darker, save on winter heat, and cut down on electrical bills.