Sorry if this is a stupid question, im just helping a friend upgrade her grow room and theres something im confused about. Shes got a co2 injection system (she uses 20 gallon tanks), and wants to install a window air conditioner in the room. She sais it will help her get the most from her co2, because the air conditioner will help control the temperatures, meaning she wont have to run her exhaust fans as often. But doesnt a window AC also remove air from the room? I was under the assumption that it does, and that running it would also remove co2 from the room.