The aim of the project presented in this tender is the complex energy modernisation of the Social Service Center in Hajdúböszörmény. Within the framework of the project, the building will be externally insulated with a 12 cm thick Rockwool thermal insulation system, modern plastic doors and windows will be installed, as well as a 12 kW solar panel system with an absorbent surface of 6 nm. Following the planned development, the energy use of the building will be significantly reduced and will be classified as BB energy class.