A system comprising: a compressor; a heat rejection heat exchanger coupled to the compressor to receive refrigerant compressed by the compressor; a first ejector having: a primary inlet coupled to the heat rejection heat exchanger to receive refrigerant; a secondary inlet; and an outlet; a first separator having: an inlet coupled to the outlet of the first ejector to receive refrigerant from the first ejector; a gas outlet coupled to the compressor to return refrigerant to the compressor; and a liquid outlet; a first heat absorption heat exchanger coupled to the liquid outlet of the first separator to receive refrigerant and coupled to the secondary inlet of the first ejector to deliver refrigerant to the first ejector; a second ejector having: a primary inlet coupled to the liquid outlet of the first separator to receive refrigerant; a secondary inlet; and an outlet; characterised by a second separator having: an inlet coupled to the outlet of the second ejector to receive refrigerant from the second ejector; a gas outlet coupled to the compressor to return refrigerant to the compressor; and a liquid outlet; and a second heat absorption heat exchanger coupled to the liquid outlet of the second separator to receive refrigerant and to the secondary inlet of the second ejector to deliver refrigerant. a compressor; a heat rejection heat exchanger coupled to the compressor to receive refrigerant compressed by the compressor; a first ejector having: a primary inlet coupled to the heat rejection heat exchanger to receive refrigerant; a secondary inlet; and an outlet; a primary inlet coupled to the heat rejection heat exchanger to receive refrigerant; a secondary inlet; and an outlet; a first separator having: an inlet coupled to the outlet of the first ejector to receive refrigerant from the first ejector; a gas outlet coupled to the compressor to return refrigerant to the compressor; and a liquid outlet; an inlet coupled to the outlet of the first ejector to receive refrigerant from the first ejector; a gas outlet coupled to the compressor to return refrigerant to the compressor; and a liquid outlet; a first heat absorption heat exchanger coupled to the liquid outlet of the first separator to receive refrigerant and coupled to the secondary inlet of the first ejector to deliver refrigerant to the first ejector; a second ejector having: a primary inlet coupled to the liquid outlet of the first separator to receive refrigerant; a secondary inlet; and an outlet; characterised by a primary inlet coupled to the liquid outlet of the first separator to receive refrigerant; a secondary inlet; and an outlet; characterised by a second separator having: an inlet coupled to the outlet of the second ejector to receive refrigerant from the second ejector; a gas outlet coupled to the compressor to return refrigerant to the compressor; and a liquid outlet; and an inlet coupled to the outlet of the second ejector to receive refrigerant from the second ejector; a gas outlet coupled to the compressor to return refrigerant to the compressor; and a liquid outlet; and a second heat absorption heat exchanger coupled to the liquid outlet of the second separator to receive refrigerant and to the secondary inlet of the second ejector to deliver refrigerant.