The Heat Pumps Lab is a research infrastructure available to industry, as well as researchers and developers. In the laboratory, individual heat pumps and complete systems can be tested under stationary and dynamic conditions. To this end, the laboratory allows for the establishment of variable, real-like operating conditions in a climatic chamber and a double calorimeter. The laboratory has a large climate chamber (10x6x6 m), in which heat pumps with a thermal capacity of up to 400kW can be tested. The chamber can simulate climate conditions, with temperatures varying from -20°C to 50°C and relative humidity of 10 to 95%.