The purpose of the project is the energy upgrade of buildings of the University General Hospital of Thessaloniki AHEPA and the improvement of their energy efficiency by at least 2 levels in order to achieve at least category B of the Energy Efficiency Regulation of Buildings KENAKOS provided interventions include, inter alia, the external thermal insulation of buildings The replacement of frames The replacement of the heating and cooling system with a system of heat pumps of variable volume refrigerant VRV The installation in each building of air conditioning systems direct expansion of multidivided multiple air-conditioned zones of variable volume VRV Inverter Type The installation of solar thermal system for the production of hot water using ZNX The installation of new lighting lamps LED technology of corresponding intensityThis upgrade will contribute to the improvement of the comfort conditions of patients and employees in the Hospital as well as to the reduction of the annual energy cost of operation of AHEPA in electricity liquid and gaseous fuels as well as to the reduction of the discharged gaseous pollutants