Abstract: The invention provides a "COORDINATED HEAT PUMP SYSTEM" which simultaneously satisfies the thermal needs of both the heat source and the heat sink. The heat pump system of the present invention is adapted to continuously withdraw heat from a heat source and continuously deliver heat at a required rate to a heat sink such that the ratio of heat delivered to heat withdrawn may be controlled by a cooling means, said heat pump system comprising a compressor adapted to compress at least a portion of refrigerant vapor from an evaporator thereof wherein a refrigerant withdraws heat from said heat source, a condenser in which refrigerant vapor so compressed is condensed and delivers heat at the required rate, cooling means for balancing the rates of heat delivery and heat withdrawal, and an expansion valve for expanding liquid refrigerant from said condenser into said evaporator.