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To decrease energy expenditures for air compression, it is necessary to keep the air temperature constant and as low as possible, thereby bringing the compression process near to isothermal when the compression reaches its minimal value. If the air is not cooled up to the temperature of the outdoor air, then the overexpenditure of the electric energy becomes more significant. As the need to use water as coolant is limited by the freezing temperature, the available energy reserve is not used. This paper shows that the possibility of energy savings during air compression depends largely on the use of the environment potential in winter on the air temperature. It also shows the energy overexpenditure for compression with the corresponding temperatures of the environment.