Are you running Coco DTW?
And what would be your ideal RH target?
Keep in mind that LEDs wants more humidity than HPS, and if your green mass is so big within a tent adding more dehums will add heat and speed up transpiration...
Your best shot is to keep plant very well deleafed and give a slightly bigger dryback on your substrate will improve a lot your condition....lots of fan too
Also....portable AC are horrible as far as efficiency....and would be much better a minisplit, that will lower your RH keeping temps in check....
ive seen minisplit mounted in tents or better in the room where the tent sits.....that would be real efficiency...

I run sealed room since many years and my RH is similar to yours with NO ISSUES, but mantain a lot of airflow with fans....
Another option would be to put a bigger, proper dehum forthe amount of water you are feeding in but positioned in a lung room, to avoid adding heat to the growspace , that will raise transpiration hence humidity...

Grapefruitroop said:

Are you running Coco DTW?
And what would be your ideal RH target?
Keep in mind that LEDs wants more humidity than HPS, and if your green mass is so big within a tent adding more dehums will add heat and speed up transpiration...
Your best shot is to keep plant very well deleafed and give a slightly bigger dryback on your substrate will improve a lot your condition....lots of fan too
Also....portable AC are horrible as far as efficiency....and would be much better a minisplit, that will lower your RH keeping temps in check....
ive seen minisplit mounted in tents or better in the room where the tent sits.....that would be real efficiency...

I run sealed room since many years and my RH is similar to yours with NO ISSUES, but mantain a lot of airflow with fans....
Another option would be to put a bigger, proper dehum forthe amount of water you are feeding in but positioned in a lung room, to avoid adding heat to the growspace , that will raise transpiration hence humidity...

Click to expand...

Thank you for your response! I’m currently with coco and aiming for humidity levels between 60% and 65%. I was considering adding a mini-split system, but I'm not quite sure how to go about it. I recently installed a new duct line directly from my central AC to the tent, which has helped the temperature drop to the mid-70s, but the humidity levels haven’t changed. I've also added a total of 7 fans—two inline and 5 10" fans—with three positioned at the bottom and two at the top of the tent. The inline are in each corner of the tent facing up. Currently, I have two dehumidifiers running, and they aren’t producing any heat since the exhaust is vented outside through a window. I’m contemplating getting a commercial dehumidifier with a capacity of 170 pints to see if that resolves the issue.

I feel it's not popular to say but humidity rises with lights on sounds like you have your meter or probe open to the light or under the light. Shade it should go down a little to night time levels.

Humidity meters are affected by light hitting them and we don't want to measure any light just the air. Makes them read wrong possibilities why lights on sees a rise.

KG1 said:

I feel it's not popular to say but humidity rises with lights on sounds like you have your meter or probe open to the light or under the light. Shade it should go down a little to night time levels.

Humidity meters are affected by light hitting them and we don't want to measure any light just the air. Makes them read wrong possibilities why lights on sees a rise.

Click to expand...

I think airflow could cause it also. Because it happened to me.
I have a 4x4 and I installed a raised floor I could move up and down. I put extractor on the top of the tent and pull from the very top of the tent. I open the 2 bottom screened vents for airflow.
I was getting OK control and numbers looked good but weirdness would happen. With 4 plants in the tent I would always get the lights out peak on humidity that I corrected with a fan boost at lights out but I was getting the same thing with lights on about an hour into the day.
Plant transperation was the cause but the fix was in the airflow.
The moveable floor was not sealed enough and the incoming air was tracking up the back wall and out the top missing plants and sensors. Had a microclimate where the only air that left the tent bounced off a wall from the sweep fan and hit the back wall and got sucked up.

Loose curtain pull openings cause leaks. Crappy zippers that in shipping the blocking flap got folded up and now gaps creates leaks. Not stopping your zipper on a horizontal area of the tent that has the blocking flap creates leaks. You can have your duct fan on 11 but if the air has an easier path than where you want it to go it will find it.
Flexible rubber strip on moveable floor touching each wall fixed mine.
Took a while.