The technical justification of the vent air heat utilization system is introduced in the article. The efficiency of the application of engineering devices, allowing to dispose of the exhaust air heat. The main devices of the heat utilization are described. The influence of the vent air heat utilization rate on energy saving parameters in buildings is shown. The methods for calculation the heat losses on account of venting air exchange and the energy saving ability in venting systems with the vent air heat utilization are submitted. Lower operating costs for heating air by heat recovery proved.