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Building simulation programs perform thermal simulations in a stand-alone scenario and, therefore, the resulting building automation is unable to handle a broad scenario of environmental changes. Due to the time needed for a building to react properly to short-term sudden weather changes, standard building automation is not enough to control energy consumption and thermal comfort efficiently: the sensors placed on the external envelop of a building provide information about weather changes too short in advance about weather changes. A meteorological station can inform in advance a group of buildings in an area about weather changes, but is unable, unlike a GIS, to identify the buildings which are really interested in the phenomenon and to send the weather changes information only to those buildings. The Swiss Federal Institute of Technology (ETH) has developed a new methodology to optimize building thermal performances by utilizing GIS, simulation, on line meteorological data and building automation.