The planners’ idea was a success. The building is both economically viable and energy-efficient to run. At 89 kWh/m² p.a., the primary energy characteristic value is below the target value in the support initiative of 100 kWh/m² p.a. The heat pump system can reach a high coefficient of performance because the temperature difference between the heat source and the supply is small, even with low outside temperatures. The energy equilibrium in the soil from the removal of heat in winter and the depositing of heat in summer also has a positive effect. However, some time and an exact observation of the energy characteristic values was necessary to find the best control concept for operating the heat pump efficiently. For this, the accompanying EnOB monitoring was extremely important. That is why relevant characteristic values continue to be ascertained.
User satisfaction in the building is very high. It must be kept in mind, however, that today’s users were both the contractors and the planners. On the other hand, this has the advantage that they have first-hand experience of the problems occurring in the operation of the building and can optimise control parameters without great dispute about responsibility or financing and without having to schedule a lot of meetings.
The idea of the building going into ”series production” is today being put into practice. The same building is currently being constructed in France. A variation on the design is planned for further locations.