The proposal is to consider a model of an existing classroom of a primary school in Turin, Scuola Elementare Leonardo Fontana (Via Michele Buniva, 19, 10124 Torino). It is part of an old school building of the eighteenth century, characterised by high vaulted ceilings and big volumes, with reflective surfaces at the boundaries. Classroom acoustic measurements have been performed in this classroom by the staff of the Department of Energy of the Politecnico di Torino and used to administer speech intelligibility tests in auralized environment. Using the geometry of the room and the optimal reverberation time obtained according to the DIN standard as inputs for the optimizing algorithm will be useful to obtain the best solution that guarantee the highest standards in terms of Reverberation Time (RT), Definition (D50), Signal to Noise Ratio (SNR) and that takes into account the cost of acoustic treatment.