Energy and building management are of particular importance when it comes to the day-to-day running of the university. After all, it is through the construction and maintenance of infrastructure that the fulfillment of the university's core task of teaching and research is made possible in the first place. At the same time, according to current figures from the German Federal Ministry for the Environment, the building sector causes a total of about 30% of Germany's total emissions. At the University of Jena, too, the majority of climate-damaging emissions stem from the energy and heat supply of our numerous buildings. Conversely, this also results in the greatest potential for action to reduce emissions. In the following, we therefore present some selected projects with which the University of Jena is trying to meet the challenges in this field.