Paper presents feasibility study of the automatic control systems of the heat energy consumption. Base methods of the buildings' heating energy control are described. Paper shows influence of the described methods on the energy efficiency of the whole building. Also calculation methodology is presented in the paper. Calculation helps to determine economical effect of the energy control system functioning during the heating period. The results of the conducted study show that the automatic control systems can significantly improve energy saving during heating season. Also the problem of the building overheating can be solved as well.