The monograph contains the results of the author's long-term research on improving the thermal preparation of construction machines in the winter period. A review and analysis of devices promising for use in thermal preparation systems is given. It is proposed to divide the winter period into time periods, each of which is characterized by its own preparation means. A comprehensive preparation system adapted to time periods with different temperature levels is proposed. A detailed theoretical analysis of possible preparation systems as single-circuit and double-circuit systems with the formation of systems of equations and their solution is given.