Unique
Experienced Auto Grower
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yes co2 a must in a room like that, in 8x8 room if went with bags 4 would do it in room that size.. actually 2 -3 would, but I always like have 1 extra bag inside... I can promise you they do work, or I honestly wouldn't even recommend to you... I'm not like that...No o am getting the 8x8x8. The thing is there is no air intake as it is totally enclosed and no way to get fresh air in unless you open the door. There for the only way to cool it is with a mini split or other ac unit and co2 will definitely help.