Abstract. The article is devoted to the problem of increasing the efficiency of using heating systems for industrial and municipal heat supply. The principles of rational cooling of furnaces and building materials are formulated, methods for stabilizing the thermal regime and conditions for the development of functional schemes for furnace units are determined. Rotary kilns under alternating of air temperature, wind speed, sunlight and precipitation lose from the side surface into the environment up to 30% of heat. The adverse effect of these factors negatively affects the thermal condition of the furnace unit with overheating in warm and overcooling in the cold periods of the year, and also reduces the lining stability and product quality. Characteristically, in order to maintain the necessary temperature at the inner surface of the furnace and extend the service life of the lining, the natural cooling of the side surface of the unit is assumed. This is an uncontrollable process with the above mentioned disadvantages. A radical solution to ensure the process requirements and improve utilization efficiency of fuel combustion energy is the organization of controlled cooling of the r
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