This measure includes the heat insulation (if possible) of the existing door panels or their full replacement with modern insulated plastic or metal and plastic doors. The recommended thermal resistance of the door structure should be at least 0.6 m2·оС/W (according to DBN V.2.6-31:2016).

The cost of insulating 1 m2 of the existing door panel is in average UAH 1,200. The cost of 1 m2 of modern pre-insulated door panel is UAH 3,000–4,000.