Cheap A/c

i have a closet grow going its maybe 3 X 6 X 9 and i was thinking of putting a window mount a/c in the wall between the grow and a spare bathroom i have the rez in, i was wondering will that a/c not function as good because its not sucking outside air, or does it just have to get air thats not from the room its cooling?
Any help is appreciated, and as always ill rep you

bro i dont see why that wouldnt work since the air outside it hotter then the air inside a air conditioned house...(im guessing you already have ac in the house but yea aslong as your catching the water it should work no problem...i figure the only reason they dont do it already is because we should get fresh air from outside and not keep reusing the same air over and over again...i hope that was understandable lol