Blowing in fresh air from out side and using co2, am i just wasting mu co2? i wanted to use my cold weather out side to help cool my grow room but wont this just waste my co2? my co2 level i use is 1400-2000 range.. Thanks for the help.
Any air introduced into a sealed area must be exchanged. Physics dude. Co2 is heavier than standard air so you might not waste as much if you vented from the ceiling.
