The Grow Awards 2026 🏆 
Fresh Air for grow Box
UltraFlatBlackstarted grow question 4y ago
Ok I have a 4x4x8 grow box that I built myself. I have a small Window A/C unit that I’ve installed just like on a regular house for cooling the air inside the box. My question is will the AC unit provide me with enough fresh air or do I need to make an additional intake for fresh
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NobodysBudsanswered grow question 4y ago
a hygrometer and atmospheric co2 levels would be required to be certain. As long as not too humid, which an ac helps lower, and keep highest co2 levels possible. if adding co2, that could be a wrinkle causing adjustment to this suggestion... should be sealed up with climate control to maximize your co2 benefit / more easily maintain 1300-1400 ppm or whatever it may be.
otherwise, i guess consider how often it runs -- which will vary based on daily temps -- and make sure the recirculation maintains some minimum that you want on a cooler day.
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