According to the energy concept of Bahnstadt, the COLOURS was built in passive house construction. Specifically, this means that the building ensemble may consume about 80% less heating energy than "normal" new buildings. This claim is already ambitious for residential buildings, but represents a particular challenge for office and commercial space.
In order for the COLOURS to reach the passive house standard, various energy-saving solutions have been combined with one another: the district is heated by means of sustainable district heating generated from combined heat and power. Highly insulated facades and windows with triple glazing minimize heat loss. Smart metering enables needs-based control and individual regulation of power consumption. When cooling the office space, the decision was made to use concrete core temperature control. For this purpose, the ceilings were provided with a pipe system through which cooling water flows. Intelligent ventilation technology in the office and commercial areas permanently checks the CO2 value of the room air and only opens the supply and return air valves when the limit value is exceeded. This form of on-demand ventilation reduces energy consumption and thus relieves the environment.