Abstract: Two differently sized condensers are positioned at respective opposite ends of a refrigerating unit. Other elements, such as a compressor and evaporator, are accommodated between the condensers. Each condenser includes a fan and a serpentine pipe defining a passageway in thermal contact with a plurality of heat transfer fins. The first larger condenser receives the gaseous phase of the refrigerant. As it changes to a liquid phase, the refrigerant passes into the second smaller condenser. The passageway of the second condenser is also smaller in diameter than in the first condenser. The smaller diameter passageway in the second condenser compensates for decrease in volume of the condensing refrigerant, permitting higher velocity flow of liquid refrigerant through the pipe for maintaining a good heat transfer coefficient. The condensers and fans also make efficient use of space inside the unit housing, enabling the size of the unit to be decreased.