Within the European Union buildings are responsible for 40% of energy consumption and 36% of CO2 emissions. Heating and cooling stand for a majority of this consumption. In order to achieve the energy reduction targets for 2020,it is obvious that an improvement in this field is required in Europe. Many activities are ongoing when it comes to energy savings and, piece by piece, they add up to a sustainable energy infrastructure. Digitalisation, however, is a crucial step to making this happen.