District heat & cooling systems (DHC) in most European countries provide considerable heat requirements for air conditioning and water heating by using waste heat with large scale of pipeline networks.However, diversities of heat resources and their supply systems in each countries lead to their own systems with careful consideration on their energy situation and geographical features.The two types of DHC are given as follows, (1) the system in which low temperature heat sources such as sea water, sewage and hot waste heat from power plant are used for heat pump......Norway, Sweden and former West Germany(2) the one in which high temperature heat sources such as waste heat from refuse incinerators and power plants are employed......France, Finland and former West Germany