The research elects as its theme the energy efficiency at univeristies buildings located at different cities of Brazil. Based on the recent Brazilian's university spread, the object of study elected is three classroom pavilion built at different inner cities of Bahia-Brazil (Barreiras, Cruz das Almas and Victória de Conquista) based upon the same architectural project. It will be evaluated the envelope's energy performance of these three buildings and their thermal impact into the classrooms. The energy analysis carried out until now are based on thecnical data of these three classroom pavilions, some of them collected in situ, and on computational simulations. From this analysis it is possible to point out some encelope's weak characteristics of each building and the major quidelines for a future retrofit.