Need Humidifier and Dehumidifier Help!

So I found a Humidifier and Dehumidifier on Amazon both around $40, I plan on growing in a 3x3 so knew i didn't need anything too big. Since I'm using a 3x3 i want to have 4 plants but where should i put the devices? is it okay for them to be sat on a shelf halfway up the tent? or is it suggested they be on the floor or what?

thanks for the help guys!
 

OldMedUser

Well-Known Member
The humidifier could sit anywhere you can make room but the dehumid should be rigged up so that the air entering the tent has to pass thru it on it's way in as that is more efficient. Might take a little DIYing with cardboard/plastic flaps and duct tape to vent it so you get nice dry air going in.

The humid should be an evaporative or misting type as the heated ones add a lot to your electric bill and add heat to the tent as well.

VapourPressureDeficitChart.jpg
 

SouthCross

Well-Known Member
I use dehumidifier for a 2x4 space within a 105square ft room. It's 45 pint. It pulls about 3-4 gallons of water in short day. The average humidity of the grow space stays at an average of 50%. I attached a hose to the back. It drains into a 5 gallon bucket. The room is also cooled with a 5000btu window AC. Outside humidity is averaging 40%.

If you get humidity problems. You'll be changing a small dehumidifier res every few hours. If it can keep up at all. The highest humidity area is around the pots.
 

OldMedUser

Well-Known Member
I've been wanting to make some kind of heat exchanger with plastic pipe to collect the water that goes out with the exhaust. For at least 9 months of the year I can use outdoor air to cool it and get my water back. Those $3.49 jugs of RO add up. :)

The humidity around the pots shouldn't be any higher than the rest of the room if there is lots of air circulation from oscillating fan(s) mixing things up properly. Same with CO2 addition. I've read a lot of threads where guys are piping it in over the plants so it can sink down onto them but that's a waste of time and extra tubing for nothing as the gas will mix right in with proper air movement. If CO2 sank to the bottom with a breeze we would all be dead as the atmospheric CO2 would suffocate us. lol
 
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