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-The paper deals with the control of low-temperature heating systems and their responses to changes in indoor environment with the main focus on indoor environmental quality and real energy savings reflecting low-energy buildings energy needs.In relation to energy savings, utilization of low-temperature heating systems is increasing today, in connection with lowtemperature heat sources, such as heat pumps. Lower temperature difference between the heating unit and the environment, along with the heat capacity, however, requires better control to be able to make effective response to potential changes in the indoor environment.

The paper deals with effect of the personalized ventilation on thermal comfort of the human body. Especially the influence of different temperatures and velocities of the supply air provided by the personalized ventilation on sitting user during standard light office work. The goal is to figure out possible and comfortable range for the personalized ventilation system and to determine the maximum power of the device. For measurement we were using a prototype of the personalized ventilation system which is able to adjust temperature of the supply air using thermoelectric elements. A thermal manikin was used to simulate the human body and to measure the effect of the ventilation system to the human thermal comfort and the PIV (Particle Image Velocimetry) was used to measure vector field around the human body.