The project concerns the upgrading of the energy efficiency of the Town Hall of Katerini to at least Class A of the Energy Performance Regulation of KENAK Buildings and the saving of a primary energy rate greater than 89 m2. The objective is the transformation of a building that operates at a high cost into a low consumption building that meets all the specifications of a modern building and is the precursor of the upgrading of the rest of the buildings of the Municipality. the incoming air Installation of LED technology luminaires drastically reducing the electrical power consumed in the building Installation of a central management and control system of the BMS KNX building etc Installation of photovoltaic panels on the roof of the building with a southern orientation of a total area of about 150 sqm and a power of 23 kW