Abstract: Disclosed is a commercial refrigeration system of a type having at least one compressor, a suction header and a liquid header at a central location or machinery center, a condenser and a plurality of remotely located evaporators, wherein a suction-to-liquid heat exchanger is embodied in the suction header of the system and all of the relatively cool gaseous refrigerant returning to the central location from the remotely located evaporators is maintained in heat exchange contact with substantially all of the primary stream of relatively warm liquid refrigerant produced by the operation of the compressor and condenser.