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Energy saving technologies play an important role in modern society.Since the prices for energy resources are showing an increase every year: the prices for gas, coal, oil have increased significantly compared to last year. Energy saving mainly concerns heating of buildings. It is important not only to reduce the cost of heating buildings, but also to use the heat obtained efficiently with the help of geothermal installations and heat pumps. The main source of heat leakage in a building is not the walls, but the roof. Therefore, the main task of energy saving is to insulate the roof accurately.