Heat and conditioned air loss through your windows is costing you more money than you might think. One of the quickest and easiest ways to reduce energy waste is to seal your windows with insulating film. 2 x 1.62 x 1.07m (2 x 64in x 42in) shrink film. Insulates two indoor windows. Complete kit with 39in (11,9m) self-adhesive tape. Use inside.