The COP21 meeting and the Paris Agreement, agreed upon in December 2015, highlighted more than ever how crucial it is for the future of mankind to hold the increase in the global average temperature to well below 2°C above pre industrial levels (and even to pursue efforts to limit the temperature increase to 1.5°C above pre-industrial levels). According to the International Energy Agency (IEA), energy efficiency is central to any energy scenario that matches this two degree limit. In fact, by 2035, investments in energy efficiency need to represent nearly half of all global energy investment in order to stay within this figure31. Accordingly, energy efficiency is a key element of EU’s energy policy