The project concerns the energy upgrading of the closed municipal gym in the district of Agios Konstantinos, Municipality of Larissaion, on 191 Heroon Polytechnic Street.The indoor gym is 250 seats, houses a basketball/volley court, has parquet floors and 4 additional mini mobile basketballs. The district of Agios Konstantinos is located in the central area of Larissa and the municipal gym has a lot of visitors to athletes/benefitees, it is adjacent to school complexes in the area of various educational levels, while every year a number of local races are organised.With the implementation of the project a significant energy benefit is expected, resulting from interventions in electromechanical infrastructure, changing frames and thermal insulation. The building after the energy upgrade will fall under energy category B.