Cultural heritage is part of our history and therefore also of our future. Maintaining historical buildings and creating future functions will cost a lot of money and is very difficult. It is even more difficult when it comes to the necessity to make them carbon neutral. These buildings are usually big energy spenders and it is difficult to take the right ‘modern’ measures without affecting historical structures. Again, these measures cost a lot of money. So innovative solutions and applications are necessary as well as demonstrations and business models.