The attention is paid to the importance of the energy-saving problem in Ukraine agricul¬ture, especially in greenhouse facilities. For energy losses reduction the closed system of heating and greenhouses ventilation (CSHV) has been offered. The static mathematical model CSHV has been developed. The decision about the equations system of mathematical model has been resulted. Experi¬mental data are compared with the data received as a result of mathematical calculations on temperature's dynamics change. The results of CSHV application are submitted to the company "Slavuta". The economic efficiency of CSHV application in greenhouses has been counted