For the buildings of three primary schools, whose founder is the Prague 13 Office, it is proposed to install a controlled ventilation system with heat recovery and installation of photovoltaic systems (SC 5.1b). The installation of the controlled ventilation system is designed to improve the quality of the indoor environment for teaching children and heat recovery will reduce the energy consumption for heating. The installation of the photovoltaic system is designed to cover part of the self-consumption of electricity from renewable sources.