Reducing energy consumption and subsequently CO2 emissions is necessary in key sectors of the economy such as energy, buildings and construction, in the public sector, in cities and urban areas. Three major aspects can be considered for reducing energy consumption : i) self-production of renewable energy, ii) reducing energy consumption by ICT infrastructure and by developing less-energy-consuming methods and protocols and iii) reducing energy consumption in all applications by integrating ICT concepts. CASANET targeted the third aspect by reducing energy consumption in public buildings by integrating ICT concept, in particular, i) contribute substantially to the improvement of winning and saving energy and CO2 for efficient buildings, ii) contribute substantially to the improvement of winning and saving energy and CO2 for efficient buildings and iii) study the impact of occupants behavior on building energy use.