Dehumidifier causing serious issues in closed grow

Pimpernickel

Well-Known Member
Random thoughts from a new grower... Are you using the same brand but different size dehumidifier? I use a Touch Point I picked up at Meijer, I forget the size but it was $200. I think it was a 40 but my girls are sleeping and I cannot go look. It would fill up overnight so I had to install a drain hose. Have you tried letting the plants go for awhile with the dehumidifier on? The dehumidifier will dry the soil up faster, the water in the soil will more readily evaporate when the vapor concentration in the air is lower. It's like the opposite of taking a hot shower where the amount of water vapor in the air gets higher it readily condenses on a cool mirror. Your setup looks nearly identical to my basement but I run 1k's.
 

stringtheory

Well-Known Member
Nope using different brands just utilizing them for their size. No specific brands. We are using a Soleus 40 pint at the moment that is barely bringing RH below 70%. We just connected the hose so it will run 24/7 or as needed.
Through this experiment, the dehumidifiers nearly run all the time because the RH we are trying to achieve is never reached. I was aware of them drying soil faster but it was the effect it had on the foliage I never expected and have not heard many horror stories. Also I am running 1k's.
Thanks friend for the help.
 

ghb

Well-Known Member
i'll stay subbed to see if you do get the answer you are searching for, if you do please post on here what was causing it.

it doesn't look like the plants are suffering too much to me, i have had plants with some leaves being crispy and dry and others being lush and flexible, they turned out lovely.

how many grows have you done previous to this one?.
 

stringtheory

Well-Known Member
Thanks for the well wishes. Currently running the hose outside of our 40 pint for continual use on a light fan speed. RH is still sitting at 70% but no foliage burn. Slowly kick it up

The plants stressed looking worse then anything I've ever seen. But they have recovered quite well. Think they are going to do just fine.

This is my first attempt at a closed room but ran intake/exhaust for years. Still learning the hard way though
 

ghb

Well-Known Member
do you not have a journal for us to follow? i love 1k buds, the calyxs just get so fat.
 

stringtheory

Well-Known Member
Work to much to allow time for journals. Also not something I feel all too comfortable with
Thanks for the help. Will let the results of the dehumidifiers through harvest be known. Really appreciate all the information everyone has given.
 
I paint for a profession and run into humidity problems all the time in enclosed areas. Have you considered a way to vent your dehumidifier exhaust outside the room? Just a thought if it isn't.
 

stringtheory

Well-Known Member
Only once did we run the dehumidifier with a transplant so extra stress may of not been good but did not cause the spiraling as I've seen it every time. Thanks Murfy

Exhausting the dehumidifier might be an option. Only thing it would do is allow the hot air to exit the room but our AC handles temps perfect and we have really good air circulation so this may be unneccasary.
Is there any other reason I'm missing why I should flush this air out? Thanks Ranger
 
Is it possible, thatwhen ur lights are on, its safe to say--> "the lights heat up the space, the heat creates some humidity (transpiring plants and moist soil) and in turn the dehumidifier kicks in, dries the air but produces MORE heat, thus kicking in the air conditioner"? <part 2>--> "then the cool, moist air (moist b/c its drawn from outside the room) from the air conditioner comes in contact with hot light hoods, ducting, heated dehumidifier etc inside the room, thus creating more humidity, which tells the dehumidifier to kick in/stay on"? <part 3>---> "then the light cycle kicks off, and the air/humidity issues are still ongoing (dehumidifier is drawing down RH, but creating heat, causing a/c to kick in, more cool/moist air hitting heat... re-cycle...)
I had a similiar issue in the past (heat/humidity) but it was due to the intake air being -40.... recovered the almost frozen room.. This constant yo-yo can stress plants out, and my buddy with some major airflow issues (including high humidity, is the only person (except you now) that I have seen having spiralling growth. Good news for hi humidity? Pretty low to no spidey-mites.... but say hello to mold...
 

burrr

Active Member
I saw your pics, and the plants don't look that bad. The leaves curl to help hold in moisture. My plants look like that, at least some strains, and are fine. My veg room is at about 40%, and my bloom room 20-40% when lights are on. Your plants will adjust their metablolism, and suck lots of water to make up for the lower humidity.
 

stringtheory

Well-Known Member
Update: 40 Pint Dehumidifier is causing no further issues. Plants look perfect after given the neccasary time to recover. Still do not understand why the larger dehumidifers caused so many problems. Would like to figure that one out. But at least this room is dialed in completely. 50%-60% RH which seems to be just fine with lots of air moving around it. No mold, moisture on walls. Thanks for the help everyone
 
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