Astonishingly, the different types of usage (preschools, primary or secondary schools) do not influence the average values (Fig. 9). Both buildings with a primary energy consumption of less than 100 kWh/(m2a) are primary schools. In contrast, consumption values of less than 150 kWh/(m2a) could be found in all building groups. This illustrates that the type of usage is not a significant parameter but rather the building itself and its respective energy standard. Fig. 10 shows the problem of new passive or low-energy standards. The thermal end energy consumption decreases significantly as shown in Fig. 3, but at the same time the electricity consumption goes up due to the increasing technical facilities, e.g. mechanical ventilation systems. As a result, the positive effect of passive and low-energy buildings compared to standard buildings is not as significant as assumed. Furthermore, only one passive and one low-energy building meet the reference values as defined in the funding guidelines [9]. Readers should note that the threshold values defined in the funding guidelines consider only the electricity use for HVAC and lighting while the values(Fig. 10) measured include the total electricity consumption of the building.