Thermal insulation of standard combined windows, the so-called. Swedish, with two single-glazed windows can be increased by putting on a sheet of transparent polyethylene film for the winter. The window sash must be unscrewed and opened. A sheet of foil is placed between the wings by sticking it with adhesive tape to one of the wings. You can also fix it with several staples. The foil should be tight and evenly stretched. After fixing, carefully close both flared wings and screw them together.
