According to the ComSos project, this work has the aim to demonstrate and evaluate the potential of using a fuel cell-based system in the building sector. In a world that has the duty to look at pollution and climate change with more and more attention, the SOFC-based systems, whit the help of other RES technologies, could be one of the most sustainable and efficient energy solutions thanks to their ability to produce at the same time heat and electricity with almost nil operating pollutants emissions (PM, NOx, SOx, VOC etc.). The system considered has to satisfy the load of a small hotel situated in Cuneo (Italy).