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Thanks for the input. Yes the system should be closed like refrigerator with the door closed. I use CO2 from a tank but the current AC pumps it out of the room ! SO it is wasteful. I want to pump the heat out and save the CO2. Humidity is handled separately. On another note there were recently...

Hi There I am building a grow room which will be about 15 by 15. I want to insatll permanent AC/ heater unit which will not waste CO2, venting it outdoors. ANy recomendations as to the type of unit I want or even manufacturer. Thanks, OW