The proposed Act concerns the energy upgrade of the building of the Municipal School of Ormylia of the municipality of Polygyros The building currently presents reduced thermal comfort conditions throughout its operation The energy inspection of the building showed that energy consumption is significant The building was classified energy during its energy inspection in category E The study proposes the interventions for the energy upgrade of the building These include interventions in the building envelope change of the thermal insulation of the facades and ceiling modification of the heating installation of the building application of a hybrid system with boiler and air heat pump replacement boiler installation photovoltaic system and interconnection with PPC for energy compensation replacement of luminaires and installation of an automatic heating control system With the completion of the interventions proposed to be applied to this building is expected to finally be classified energy in category A of the KENAK