The project concerns the energy upgrade of the Spring Gymnasium and the Drosia Gymnasium of the Municipality of Dionysos, Attica with the implementation of the following interventionsReplacement of the frames with new low thermal transmittance systemsInterventions in the heating system of the building change of circulator boiler and installation of a compensation systemReplacement of conventional lamps with LED saving lampsDrosia GymnasiumReplacement of the frames with new low thermal transmittance systemsInstallation of an external thermal facade system Thermal insulation of a roofReplacement of a boilerReplacement of conventional lamps with LED saving lampsWith the implementation of the above proposals, both schools will be upgraded by two energy classes from D to B