During the new construction of the "Hüttengelände" residential area in Neustadt, thermal heat pumps are being used for a CO2-free heating supply. The pumps are supplied via an uninsulated cold local heating network. This obtains environmental heat at approx. 10°C from a central 15,400 m² earth collector field. The thermal heat pumps decentrally supply 72 single-family homes, 44 apartment buildings and a number of commercial premises (senior citizen's home, nursery school, and supermarket) heating energy and hot water.