The act concerns the energy upgrade of the 5th Lyceum 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 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.The operation of the operation is expected to reduce the energy consumption of the building and reduce CO2 emissions through the upgrading of the Energy Efficiency Class of the building, while at the same time the upgrading of thermal comfort conditions and, by extension, the qualitative improvement of the operating conditions of the school and the students.