When modifying the box-type court to a subsidiary museum of the prehistoric national compilation of Munich with multiple-purpose hall and a little restaurant, a considerable expenditure with regard to the preservation of monuments had to be done in order to uncover and keep the old built volumes. A low-temperature heating system as well as low-temperature oil/gas boiler were applied as heating system. The heating is realized via floor heating, plate heat exchanger for avoiding corrossions, hot-air heating, heating units and fan convectors. For energy saving an air-to-water heat pump was applied which can be used alternatively for heating or cooling. In addition, energy distribution and system control are treated by means of flowsheets. (BWI).