provided is a method including routing a compressed gas from a centrifugal gas compressor through at least one of a plurality of air coolers , and directing air flow through the plurality of air coolers , wherein the plurality of air coolers are arranged adjacent to one another in a single plane that is transverse to the air flow . further provided is a method including removing tube cores from a cooler chamber of a liquid cooler of a centrifugal gas compressor , coupling a chamber port of the cooler chamber to a first port of an air cooler , and coupling a second port of the air cooler to a compressor port of a stage of the centrifugal gas compressor .