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Global monthly consumptions are often insufficient to allow an accurate understanding of the building’s behavior. Even if some very rough results can be expected from the analysis of monthly fuel consumption, global electricity consumption records analysis do not allow to distinguish the energy consumption related to AC from the consumption related to other electricity consumers. Even if the analysis of the energy bills does not allow identifying with accuracy the different energy consumers present in the system considered, the consumption records can be used to adjust some of the parameters of the simulation models. Some basic data, as building envelope characteristics or the type of HVAC system, are easy to identify, but parameters related to infiltration and ventilation flow rates, operating and occupancy profiles and performances of HVAC components need always to be adjusted. To this end, SIMAUDIT offers a large range of available HVAC equipment and offers to calibrate the simulation model by tuning these parameters.