The operation concerns the energy upgrade of Geotef’s Central Greece Branch building. This is an existing building of NEW, Energy Class Z, which is expected to be upgraded to Category B+ with improvement of its energy characteristics.The energy upgrade of building includes the following interventions:Thermal insulation of exposed ceilings and floors, thermal insulation of masonry, replacement of frames, interventions in the heating system (WA boilers, installation of fan coils and thermostatic valves), aeration system, thermal insulation, installation of air conditioning systems.