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I'm surprised none of the machinist have chimed in of this.... when air passes through a vortex, it becomes very cold, even to the point of freezing... hence air is used in some machining applications where coolant or oil will contaminate a part....
all that said, the volume of air and moisture content of the air being used is more signifigant than the actual tempeture, goiong form cold to warm may create a problem with line condesation.... if your using acrylics, most air brushes do nicely with 30 PSI, I spray metalics at 40 and my primer thorugh an automotive type gun at 60 PSI, my compressor is a 27 gallon oiless unit... buy quality regulators to avoid pressure drops, complete with moisture traps, and filter your air, more than likely you will have no issues...
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