A Heat Pump is a System that can Cool, Heat, and Dehumidify Air in a room, depending on the demand. These systems have a Reversible Heat Transfer Cycle. The Heat Pump is not a Pump in the strict sense of the word, but a System with the aid of which low temperature heat can be elevated ("pumped up") to a higher temperature level. The Heat Pump Systems operate on the thermodynamic principle of a Refrigeration System. It allows the exploitation of the energy provided by heat sources such as air, water and soil, and also the exploitation of waste heat from industrial processes.