This would probably be just a second type of self contained A/C, but:
A/C mk2 has a fluid canister port instead of a waste pipe. Holds up to 300 mols.
Synthesize refrigerant in a furnace, where, starting with X (flourine, presumably for this case), adding coal and/or volitiles can create different classes of refrigerant.
(Arbitrary classes and ratios as example)
Class 1: 1:2:0 ;; CO2:X:VOL // most effective when incoming temp range is 0-100C // condensation at 25C.
Class 2: 2:1:1 // 100-200 // condenses at 125C
Class 3: 0:3:2 // 200-300 // 225C
Etc
Though mixed as gasses, would have to be conde nsed to a liquid before usable in A/C.
Any chemists are free to critique.