I tried my hand at co2/sealed room. Only thing I changed up was sealing the room, adding co2, and changed my ac. My 1st run was an epic fail. 16 big plants with 80% fluffy buds that were pretty much worthless. Lost my ass, and had to buy meds from my buddy so my patients could have proper meds, and not my fluffy bullshit. 2nd go at it was much better. Still after growing for 4+yrs damn near perfectly, then f ing up with the co2, I went back to my old proven air exchange room, and my old ac. Heat was my issue, and the new ac couldn't keep up with the demand. My old ac could, but not going back.