Hello RollItUp!

My first post

I am starting my first hydroponic grow in af few weeks.
I was wondering exactly how much i would have to exhaust from the growspace during the night-hours to keep CO2 levels up and humidity down.
So i guess my question(s) is:

1. Does plants use any CO2 when lights are off?

2. I know plants evaporate great quantities of water during day due to photosyntesis. But do they evaporate any at night?

I would prefer to turn down the fans during nighttime, because my bedroom is just next to the grow. I cant have noise when i sleep.


/FreNzyBud Out

You do not need to worry about CO2. Humidity is the issue. Even if the plants aren't transpirating, there will still be moisture in the room. The ambient R.H. is going to have a major effect on this, but if it gets damp and you don't have circulation, you'll get mold.

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you will need as much if not more fans on the dark cycle to keep humidity down or dehunidfier

plants do not use co2 in the night cycle but they do seam to make co2 level rise at night

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