In this course student obtains knowledge in designing of low-energy structures with utilization of passive components of solar systems. Student acquaints with utilization of active solar systems, e.g. renewables. On example of specific disposition does evaluation of family house or residential house and its adaptation onto low-energy house, with calculations of heat energy consumption in heating period, determination of energy savings, calculation of heating costs and rough calculation of economic data, it is return of investments needs for thermal insulation.