The Municipal Sports Center of Agrinio “Michalis Kousis” is the main sports infrastructure of the Municipality of Agrinio and the wider area. It is located in the area of “Voidolivado” and is the largest and most organised sporting area in the Prefecture of Aetoloakarnania. Construction began in 1959-60 and the completion work lasted 22 years, occupying an area of 75 acres.The Indoor Gym of the Municipal Sports Center was built in 1981 and is of a total area of 1.545 m². The building is made of reinforced concrete and brickwork and has metal frames with simple glazing. The roof of the building is metal with a total thickness of 5 cm.Since the building is constructed before 1985, the energy upgrade provided for in this project will help address the significant environmental problem of fossil fuel consumption through upgrade of heating, lighting and reduction of losses. The intended results relate to the reduction of the energy consumption of the building and the parallel reduction of CO emissions