The Municipality of Thebes, in its effort to contribute positively to environmental and energy management issues, has the will to proceed dynamically in the field of energy savings and the exploitation of Renewable Energy Sources.This project concerns the energy upgrading of the closed Municipal Gymnasium “Andreas Herricane Hatzopoulos” of the Municipality of Thebes and mainly concerns architectural and electromechanical interventions for the energy upgrading of the gym and the adaptation of the public building to the framework of the modern project. Energy upgrade of building shell. It includes the addition of thermal insulation, roof and masonry and the replacement of old windows, doors, windows and windows with modern, certified energy efficiency.2. Energy upgrading of electromechanical installations. It includes the replacement of solar panels for hot water (ZHX), the replacement of the central heating and air conditioning system, the installation of photovoltaic systems and the replacement of the lighting system for pitch space, auxiliary spaces and external lighting with corresponding, less energy-intensive.After the completion of the project, the building is expected to be upgraded to Category B of the Buildings Regulation (KENAK), from category H, where it is currently classified.