The building under consideration of the 9th Primary School of Chania is located on Skra Street in Chalepa Chania of the Municipal Unit of Chania It is a two-storey tile roof building with reinforced concrete frame and brick walls without insulation The ground floor houses classrooms and boiler room The first floor also houses classrooms and professors' offices It has an external staircase as well as an external lift for access to the floor The object of the proposed operation is the energy upgrade of the building through the replacement and installation of waterproofing and thermal insulation on the roof of the installation of an external thermal facade system in the shell and the replacement of external frames with corresponding ones that will have thermal break and double glazing Also proposed the installation of a high efficiency heat pump for the cooling of the building and the replacement of the existing fluorescent lights with corresponding new LED technology with simultaneous installation Automatic lighting control system According to the EPC issued security number XFUDYX4F230QR3CV the building is to be upgraded from category E to category B