The project concerns the energy upgrading of the building complex of the Professional Lyceum (EPAL DK) Polygyros. The school complex is built on a private plot of the Municipality of Polygyros and is a total area of about 3,144 sq.m.It is the only school complex in which the units of the Institute of Vocational Training (IEK), Vocational Schools (EPAS), Continuing Vocational Training (TEK) and Vocational Lyceum (EPAL) are housed for the entire Kallikratiko Municipality of Polygyros. The school complex consists of 3 buildings. In buildings 1 and 2, the classrooms, the auditorium and the faculty offices are developed with the necessary auxiliary spaces. Building 3 houses the necessary workshops for the operation of EPAL and IEK. The energy consumption of all 3 buildings is very important, placing them in category H of the Buildings’ Energy Efficiency Regulation (KENAK). This project provides for interventions for the energy upgrading of buildings, including work on the housing of buildings (heat of the faces and roof, replacement of windows), modification of the heating installation of the complex (application of a hybrid system with boiler and air-water heat pump), replacement of boiler, replacement of non-functional heating bodies, installation of automatic heating control system, replacement of luminaires by a new LED type, the installation of the PPC connector and the power grid. Upon completion of the project, the buildings are expected to be classified as category A of KENAK.