Abstract: A secondary drive system for an air conditioner compressor includes a conventional air conditioning circuit having integrated therewith a secondary compressor drive. The secondary compressor drive includes an air motor for selectively operating the otherwise conventional compressor of the air conditioning circuit and a compressed fluid source for driving the air motor. The compressed fluid source includes a pressure vessel and a collection reservoir. Heat generated in the operation of the air conditioning circuit is utilized to convert a liquid phase of the operating fluid into a highly compressed gas within the pressure vessel whereafter the resulting compressed gas is utilized to drive the air motor. The air motor operates the compressor of the air conditioning circuit. The operating fluid is captured within the collection reservoir as a gaseous or vaporous operating fluid for reuse in the system of the present invention.