jeremy25
What is the condition of the incoming fuel? Is it too cold all the time, is it too hot all the time or is it sometimes hot sometimes cold? What is your tolerance on the temperature +/- 1 or 10 or 30 degrees.
The simplified answer is you need a heat exchanger and either a heat source or a heat sink.
Compressed air (normally hot gas)is cooled using air to air heat exchangers or air to water heat exchangers or refigerated heat exchangers.