Efficiency please!

I used to run an air cooled hps and I’ve recently switched to led so I’m learning a bit. I currently am having trouble getting my humidity down. At night it can be upper 70s% rh . Hovering around 60-63 during day. There are no ducting ports on the bottom so I realize intake placement isn’t ideal.

1.I live in a humid climate.

2.I have a wall ac that I can duct into my tent(first pic and yellow circle in third pic)

3.I have a 6inch exhaust fan in my attic with a speed controller (second pic blue circle third pic )

4.The tent does not have intake options on the bottom just a flap I can open but not duct into really, only on the top of the tent

5 the room the tent is in is a laundry room with no central ac just the window unit as mentioned

I feel like I’m doing a dance between pulling cool air in but also getting rid of it but not the humidity. If anyone has any input on how I can keep my humidity down and not keep my ac running constantly that would be great. I’m not getting my overnight dry backs and I believe it’s partially due to my high humidity.

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Lower the speed to raise the temperature for a bit and see what it gives you.

Try 81f .

Reason I say that is if its say 20c and 63rh
If you raise the temp to 25c the rh is then 43rh.

But obviously to raise the temp in your situation you will have to slow the airflow which will naturally mean higher rh due to less extraction.
But it's worth trying, since itl take an hour and see what happens.


Other than that. A big dehumidifier in the laundry room.

Also defoliation helps, but is a bit extreme if you don't normally defol

Also, why not use your flaps instead of that intake up top?
If not, lengthen that duct so it's a foot off the floor, your essentially just sucking out the air without any circulation.

I would treat the laundry room as a lung room if possible. Put a dehu in there and move the window ac unit to serve the laundry room somehow.

You are using the ac air and dumping it into the ceiling so you will never have control like this

If you want a low intake why not cut one in yourself? https://www.secretjardin.com/ducting-flange-connectors/

Maybe you could get away dumping air up while lights are off, but if your house is too humid then you are just bringing in more non conditioned air

Thanks for the input. I tried the lung idea but I couldn’t get my room cool enough for the lights to be on.
Currently I have the ducting further down and the tent door open slightly and I think it’s been ok but of course trying to optimize it.

Thanks for the link to the intake. Would you guys recommend hooking my ac up to that or keep it passive? If I cut the hole it will either be below my flood table in the tent which I think may not flow as well air wise or right about the flood table which I imagine may be too cold on the pots or too high up. Any ideas? Thanks again

Night713 said:

Thanks for the input. I tried the lung idea but I couldn’t get my room cool enough for the lights to be on.
Currently I have the ducting further down and the tent door open slightly and I think it’s been ok but of course trying to optimize it.

Thanks for the link to the intake. Would you guys recommend hooking my ac up to that or keep it passive? If I cut the hole it will either be below my flood table in the tent which I think may not flow as well air wise or right about the flood table which I imagine may be too cold on the pots or too high up. Any ideas? Thanks again

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I think you are just sucking all the air into the hole up through the ceiling right? You'll never be able to control this if sucking humidity from outside, into your house, then up through the grow room. You can try not venting into the attic or wherever that goes and just recirculating it into your house and conditioning that (then worrying about co2) or ..
the way I got around all of this was just air conditioning the whole house then adding a dehumidifier for the RH control. Using the building as an envelope and controlling the RH through a dehu and temp through several AC window units, it is easily achievable but expensive.

Night713 said:

Thanks for the input. I tried the lung idea but I couldn’t get my room cool enough for the lights to be on.

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What is your target temp on lights on? Believe it or not LED can go 75-85 degree temps and be completely fine

Free tent? get the ac ducted to the floor. Airflow right/left up/down 80% can be made safer.

Is the wall ac a split system? If so ducting that into the tent may help reduce the humidity on its own.. mine has a drying option included in its programming.