Our activity has focused on the energy diagnosis of n. 194 public buildings in the region Friuli Venezia Giulia. The service is divided into several phases: Collection of preliminary information (including bills for a significant period) in order to carry out a'analysis initial energy (consumption and energy needs, type of production processes);Survey aimed at analyzing energy internal processes in place ( use and energy management ) , with any findings and measurements in situ ; Processing of the data collected , compared with benchmarking and preparation of the final report of the DE ;Identification of possible areas of energy efficiency intervention ;Preliminary assessment of technical and economic feasibility of the proposed interventions .