Dehumidifier

I have a small dehumidifier and I need to use it because the humidity in my flowering tent is too high after the lights go out. So, I am wodering if I should put the dehumidifier in the tent or in the room where the tent is? Any ideas?

Does anyone else have humidity issues in their tent after the lights go out? I'm assuming its due to the plants persperating and all that moisture is trapped in the tent. The humidity drops to about 52% after the inline fan and lights come on.

...it would be best in your room but alot of those dehumidifiers put off heat....watch your tstat, if heat becomes an issue put it outside of the tent....

Inside the tent will be most effective, but why aren't you leaving the fans going all the time?
That will help also.

imchucky666 said:

Inside the tent will be most effective, but why aren't you leaving the fans going all the time?
That will help also.

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Good point. Totally missed where he said fans went off.

I have a small dehumidifier in my 3x3 tent.
It does put off a little heat, but I move air 24/7

I have 2 fans running in the tent 24/7 but not the inline fan that cools the hoods. Should I have the inline fan on 24/7 as well?

I have to use one too as my room is in my basement but just inside the growroom should suffice to bring the humidity down. I wouldnt put it inside the tent unless it was a real small one.

I understand that part, I just need to know if you leave your inline ventilation fan on 24/7.

If you do not change the air out, the humidity will rise. I change my air out if the lights are on or not.

Do you have a big temp drop at lights off?

Keeping you're on/off temps fairly close will help keep humiduty low

Yeah....there is a good 10 degree temp diff from lights on to off.

OK. Now I left my inline fan on all night and when I got up this morning, the humidity was at 42%. Now that brings me to the next question....is 42% too low?

...NO, 42% rh is perfect in the flowering room....leave the inline fan on constantly.

Sweet. I'm finally getting this thing dialed in!

But, is a 10-15 degree temp swing from light to dark too big? Will it stunt the plants? 65 being low and 78 being high.

even better , make sure not to go below 60-65, cold nights will make your plants go purple and potentially increase potency I am not sure (potency has nothing to do with the purple though!!)

I gotta watch the cold then....winter isn't even here yet.

Thats the problem I had with my hps setup, at least the air in my basement was dry!! but I had to shut the inline fan on light off because the air was coming from outside, it was my first grow and the high humidity spike at night didnt affect anything, I got lucky I guess. Now I grow with LEDs and the air from outside will be way too cold for my setup so it comes from upstairs in my house and the inline fan is running 24-7

So cool nights can actually increase the potency of the buds? Meaning not too cool but in the 60-65 range?

hunter22375 said:

But, is a 10-15 degree temp swing from light to dark too big? Will it stunt the plants? 65 being low and 78 being high.

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I like the humidity low when budding. I have read that very low humidity at the end of the bud cycle will add resin. I don't know.
It is really dry where I live, but when the furnace isn't running, my tent will get in the 50s, too high for me. When you grow fat buds, you do not want to chance mold. Tents can get little pockets that do not get fresh air due to growth etc.

I have read that you don't want more than a 10 degree change, the recently read that you do not want a change at all. 65 isn't that bad though.

Ideally you want it 75 at all times. My tent use to get down in the 50s when the lights were off, way too low. It ended up stunting the plants and delaying them big time. A 65 day blueberry took 75 days.

You can get a seedling mat for cheap and put it on a timer to only run when the lights are off. The plants roots stay warm and I think that is most of the battle. The next run I did after adding the mats budded in the exact amount of time they should have. The air temps still got a in the 60s when the lights were off, but the plant stayed warm because of the mat.



They are only 17 watts and will keep the plants happy.