The act concerns the energy upgrade of the school Kartalios complex of Volos. It is an existing school building of Energy Class H, which is expected to be upgraded to Category B with an improvement of its energy characteristics. The Kartalio school complex is located between the streets Kassaveti Polymeri Trikoupis, in O.T. 641, with entrance to the courtyard on Kassaveti Street. It consists of two wings that are perpendicular to each other and are connected to a common staircase space. Both wings are three-storey, constructed with reinforced concrete frame and filling of brickwork. The building is housed in the 5th Gymnasium of Volos, the 1st PAL of Volos and the 2nd Evening of Volos, resulting in the building being in use for most of the day.