Humidity issue in 4x2 grow tent

Run the fans 24/7

You need to lower the RH of the ambient air. If the RH where you live is hi you will not be able to lower it much. You are exchanging the air in the tent to fast.

So you would have to lower the RH in the entire room not just the tent.

Failmore said:

You need to lower the RH of the ambient air. If the RH where you live is hi you will not be able to lower it much. You are exchanging the air in the tent to fast.

So you would have to lower the RH in the entire room not just the tent.

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That was my thinking as well, which was why I tried putting the dehumidifier outside the tent to test it but then it went way high inside the tent and I had to switch it back. I think it makes the most sense to get another dehumidifier for outside the tent as well. Although I probably do need an intake fan as well.

It's easy, just install central AC...no big woop

Just keep enough air moving in the tent. And defoliate enough that air moves without much resistance. Don't overthink it, weeds pretty easy we just make it harder.

Failmore said:

It's easy, just install central AC...no big woop

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Window units a lot cheaper and well worth it imo, but I run hid and was doing hydro(switched to soil, it's way less trouble) so environmental controls were kinda a big deal. Now I just keep the room at 72 and during lights on the tent gets up to 82-83 and water every other day, once a week a bit of compost tea and mollases. Beats the shit out of having to monitor and regulate a dozen dwc reseviors.

That makes sense. I just have my 2 buckets connected and run a recirculating water chiller to keep the water at about 67 degrees in both of them. I noticed I was having heat problems in the water the first couple weeks of veg. Haven't had a problem since and it has regulated itself pretty well. That water chiller made all the difference.

The humidity has been the big battle for me. It has rained every day for the last couple weeks so it's been brutal trying to fight it. And of course it's been my last couple weeks of flower when it's at it's worst lol

That is an awful lot of fans for a 2X4 tent.
All I use is one 6 inch oscillating fan in my 2X4. With 320W COB LEDs.
In Oregon.
Which is really dry now, but winters are wet.
Not sure if all these fans are helping or hurting you.
And AC is a dehumidifier, plus you have one other unit and want to get another?
Something else is going on.
Is your hygrometer wonky?

A dehumidifier, outside the tent, running strong in order to dehumidify the entire room the tent is in to say 45%. If your dehuey is in the tent now, it likely needs to be bigger for the room but you can test it out.

THEN, if needed, you run the portable just enough to lower the temps to where you want them. So...

The dehuey is in the room circulating such that it lowers the room down to 45%. That will raise the temps going into the tent.

The exhaust OUT of the tent goes OUT of the room! Then you have solved your issues (imo).

Only thing that can work in the tent is a small heater as needed.