Abstract: A removable window insulator preferably includes at least one pane, at least four frame members, at least four compressible seals and at least four adjusting members. At least one frame member is mitered on each end thereof. An edge seal strip is attached to an outer edge of each frame member. A single compressible seal is inserted between ends of two adjacent frame members. A single adjusting member is used to set a distance between adjacent frame members. At least one cross member may be secured in an inner perimeter of the removable window insulator. Second and third embodiments of the removable window insulator are used to seal a double window. A fourth embodiment of the removable window insulator is used to seal a window with a partially curved perimeter.

Abstract: A removable window insulator preferably includes at least one pane, at least four frame members, at least four compressible seals and at least four draw members. At least one frame member is mitered on each one thereof. An edge seal strip is attached to an outer edge of each frame member. A single compressible seal is inserted between ends of two adjacent frame members. A single draw member is used to draw the adjacent frame members together. At least one cross member may be secured in an inner perimeter of the removable window insulator. Second and third embodiments of the removable window insulator are used to seal a double window. A fourth embodiment of the removable window insulator is used to seal a window with a partially curved perimeter.