you might have misunderstood me. let me rephrase. lets say one room has been up and running trouble free with the 5ton (60 000) btu AC unit and all other related equipment for a considerable time with no problems. since the unit is cooled by water the unit sits in the room. no need to exhaust any hot air from the ac unit. room is a CGE room with CO2. now a second room right beside the first one is to be used for the same purpose. it has its own CO2 supply and the ballasts are now on a flip. what is the best way to try to keep the AC unit in the original room...but when the lights flip...have it cool the second room...but not the original.