Help regarding ventilation

Had to close the garage window now, outside temp dropped to 10c, which means it's getting too cold in the tent as well. Also really low humidity, so quite the problem. I'm now trying to vent the exhaust inside the garage one direction, and take new air in from another direction. Might have to open door/window occasionally to lower garage temp, might not. The outside temp will keep falling now to minus so I guess we'll see. I have a humidifier running for 12 hours inside the tent to help with the humidity.
Next grow will definitely be with LED!
 
As the outside temp dropped I decided I no longer need the massive 250mm fan to take hot air out. So I removed that and I now only use a normal 125mm outtake fan, with open vents in the bottom of my tent for intake. This has resulted in a near perfect temperature! But still the problem with humidity prevail. I just don't know what to do. Should I just spunk out on another massive ultrasonic humidifier? Already got one with a 7l tank... Tried a couple of bowls of water, hot and cold. Towels, spraying the walls, raise the humidity in the garage. But I'm still stuck at a humidity around 50%. According to 3 different hygrometers...
 
You should close up some of the intake. All I use is one 4" fan out and a 4" piece of duct for the intake. But I am inside with a 2 plant tent.

I only worry about too high of a temp. In the winter I see 60F with the lights off. Upper 70fs and 62% in both right now with lights off. Usually mid to lower 80fs for highs.
 
I just go with what I got. Again I usually have a too high problem. But you either have to slow down the air exchange or speed up the water misting.

How about using towels on the bottom and keeping them wet?
 
Tried the towel thing for two days, but it's a hassle doing shuttle traffic between bathroom and tent to get water as they dried up really quick. Now I have a big bowl of hot water and a wet towel hung up above it with a fan blowing on it as well. It helps for a little while, but it's not a sustainable solution. But I actually keep hearing that 50% isn't critical. All the other levels are close to perfection now so maybe I just need to chill. Too bad I don't smoke what I grow...
 
Make sure you give the plants plenty of water. I would think the low humidity would make the plants transpire a lot more water much easier and grow faster. But I am not a Dr...... :)
 
Air cooled hood with Hps, vent through from outside. Temp controller plugged into rad or heater tubes.(all highest wattages for space) This solved 95% of my heat and cold issues. Peak summer dim my lights. Humidity domes work, tho I do think a dehumidifier is more important in a tent to ward frm budrot
 
Mrwilliam said:
As the outside temp dropped I decided I no longer need the massive 250mm fan to take hot air out. So I removed that and I now only use a normal 125mm outtake fan, with open vents in the bottom of my tent for intake. This has resulted in a near perfect temperature! But still the problem with humidity prevail. I just don't know what to do. Should I just spunk out on another massive ultrasonic humidifier? Already got one with a 7l tank... Tried a couple of bowls of water, hot and cold. Towels, spraying the walls, raise the humidity in the garage. But I'm still stuck at a humidity around 50%. According to 3 different hygrometers...
Click to expand...
Get an Inkbird humidistat and a decent size cool mist humidifier in the tent and close it up.
 
Thanks for replies! I actually put on some humidity domes yesterday to try that. From click and grow. They won't last long as they're really small, but it's giving the ladies a bit help now at least.
 
Just a little update: Went through the whole system and checked every level and took all the measure I can and all the levels are close to perfect now! Humidity is even at 70% for now. Probably decreasing in the next hours, and I will probably have to maintain it quite often, but it's above all expectations for now.
Only thing I'm a little worried about now is how far down the seedlings are in the rockwool. I think maybe I used too big rockwool pieces as they are submerged about half way down in them. Is that acceptable? Or should I make the rockwool smaller?
 
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