The act concerns the energy upgrade of the building of the 5th High School of Trikala. It is an existing school building of Energy Class H, which is expected to be upgraded to Category B+ with improvement of its energy characteristics.The energy upgrade of the building includes the following interventions: roof insulation, shell insulation, replacement of frames, installation of permanent shading system, installation of heating system with EP, ventilation system, installation of LED lighting.From the operation of the operation, the reduction of the energy consumption of the building and the reduction of the CO2 emissions.