Abstract: A window insulation apparatus includes a cylindrical core having opposite top and bottom ends. A plastic sheet has opposite top and bottom ends and is pleated along parallel fold lines that extend parallel to the top end of the sheet to form a folded sheet. Adhesive is applied adjacent the top end of the sheet. The folded sheet is wound around the cylindrical core so that the top end of the folded sheet is near the top end of the cylindrical core. A housing receives the core and the sheet wound on the core. The housing includes an elongate opening from which the sheet can be unwound. A cutting assembly is mounted to the housing substantially adjacent the elongate opening and can be moved parallel to the opening for cutting the sheet that has been dispensed from the opening.