Humidity issues

Terpyderpy1717 · Apr 22, 2022

I now have 2 humidifiers in my 4x4x6.5’ tent and the RH is still below 35%.. I’m lucky if it’s above 31% honestly. I run a spider farmer sf4000 and currently in week 6 of flower and my light intensity is 95%. My overall temps throughout the day with lights on is 82-86 but the dang RH is below 35%. I didn’t have issues until I raised the light intensity above 90% and that’s when I put another smaller humidifier in the tent but it doesn’t seem to change the RH at all. I have a tower humidifier on the highest setting and a small humidifier on the highest setting and yeah, RH is about 33%. Any suggestions as to what I can do to improve this?

PJ Diaz · Apr 22, 2022

Swamp cooler

Bukvičák · Apr 22, 2022

Terpyderpy1717 said:
I now have 2 humidifiers in my 4x4x6.5’ tent and the RH is still below 35%.. I’m lucky if it’s above 31% honestly. I run a spider farmer sf4000 and currently in week 6 of flower and my light intensity is 95%. My overall temps throughout the day with lights on is 82-86 but the dang RH is below 35%. I didn’t have issues until I raised the light intensity above 90% and that’s when I put another smaller humidifier in the tent but it doesn’t seem to change the RH at all. I have a tower humidifier on the highest setting and a small humidifier on the highest setting and yeah, RH is about 33%. Any suggestions as to what I can do to improve this?

Try to put them outside and point them on the intake hole…

Terpyderpy1717 · Apr 22, 2022

Bukvičák said:
Try to put them outside and point them on the intake hole…

You suggest I open a flap on one side of my tent and set the humidifier near that flap outside? I have an intake fan but it’s pretty ghetto rigged and couldn’t really put a humidifier near it to force it through the ducting I’ve used..

Kerowacked · Apr 22, 2022

How much water are these humidifiers using?

OldMedUser · Apr 22, 2022

Terpyderpy1717 said:
I now have 2 humidifiers in my 4x4x6.5’ tent and the RH is still below 35%.. I’m lucky if it’s above 31% honestly. I run a spider farmer sf4000 and currently in week 6 of flower and my light intensity is 95%. My overall temps throughout the day with lights on is 82-86 but the dang RH is below 35%. I didn’t have issues until I raised the light intensity above 90% and that’s when I put another smaller humidifier in the tent but it doesn’t seem to change the RH at all. I have a tower humidifier on the highest setting and a small humidifier on the highest setting and yeah, RH is about 33%. Any suggestions as to what I can do to improve this?

Is the tent being vented all the time? If so you need to stop that and somehow control the temps. Like using CO2 it won't work if an exhaust fan is running all the time.

If your tent is in a room run the humidifier(s) in the room so as air enters the tent it is at a higher RH. Gives you more room in the tent as well.

:peace:

Terpyderpy1717 · Apr 23, 2022

OldMedUser said:
Is the tent being vented all the time? If so you need to stop that and somehow control the temps. Like using CO2 it won't work if an exhaust fan is running all the time.

If your tent is in a room run the humidifier(s) in the room so as air enters the tent it is at a higher RH. Gives you more room in the tent as well.

by vented do you mean do I have a flap open at all times? If so, no.

Bukvičák · Apr 23, 2022

Terpyderpy1717 said:
You suggest I open a flap on one side of my tent and set the humidifier near that flap outside? I have an intake fan but it’s pretty ghetto rigged and couldn’t really put a humidifier near it to force it through the ducting I’ve used..

Okay can you describe how your ventilation setup?

OldMedUser · Apr 23, 2022

Terpyderpy1717 said:
by vented do you mean do I have a flap open at all times? If so, no.

By vented I mean is there an exhaust fan running all the time like a lot of people have? I have a temp/rh and speed controller that only turns my exhaust fan on when the temp or rh get higher than my settings. Very dry here so I've been dealing with humidity problems for 20 years. My basement is cool at 52F right now and can get down to 40 or so in the deep of winter when the rh in the house is around 10%. Even with a 600w HPS going the fan only kicks in once an hour for a few minutes. The room is half full of plants in early flower so that keeps the rh up around 60% now. i'll want it lower when the buds get bigger so I don't get bud rot.

I've just learned to feed less when the rh is low or the plants burn easy. For about 3 months in the summer the rh is around 60% but the rest of the time it's dry as a popcorn fart.

If you humidify the air in the room then when your fan sucks air out of the tent it will be pulling in moist room air and help keep your rh up better. With the humidifiers in the tent it's sucking all your nice moist air out and bringing in drier air so the rh drops of course.

Better problem than living where the outside rh is 80+% all the time and having to lower it.

:peace:

DoubleAtotheRON · Apr 23, 2022

Fully agree with @PJ Diaz .. a swamp cooler is awesome for creating humidity without making the "drywalll dust" effect of atomic mist humidifiers. A great company is Portacool. I use the 110 model to keep my RH at ~60-65% during early veg in a sealed up room. No air coming in, no air going out. Running CO2. I have a valve on my mini split that will either go to drain, or to the Portacool. Keep in mind that I bastardized this Portacool for easy maintenance. The condensate water runs much cleaner, and does not clog up the honeycomb media. I use it until my room has enough biomass to create thier own humidity, then i have to transfer to dehueys about mid flower, then move the Portacool to the clone room. It's also great at helping to keep the room cooler if you need to. I have my AC set on Auto at 80 degrees currently in week 5 of veg.

lusidghost · Apr 23, 2022

I built a DIY humidifier with a three disk ultrasonic mist maker, a float for it, a 12" waterproof fan, an Inkbird humidity controller and a tote. I only have to fill it up ever few days and it puts out a ton of mist.

lusid's Cave of Blunder & Husky Hut

Same roots as yesterday.

www.rollitup.org

Terpyderpy1717 · Apr 23, 2022

Bukvičák said:
Okay can you describe how your ventilation setup?

I have a 6” ac infinity exhaust fan inside the tent extracting air out. I have the controller set to go off whenever temps or rh get too high/low. I have a cheap setup outside with a fan sitting in front of ducting to bring cooler air from outside the room into the tent. (There is a filter on the ducting, I at least did that) lol. And I have 2 oscillating fans inside the tent with one blowing on the drivers of the light only when the light is on

Terpyderpy1717 · Apr 23, 2022

OldMedUser said:
By vented I mean is there an exhaust fan running all the time like a lot of people have? I have a temp/rh and speed controller that only turns my exhaust fan on when the temp or rh get higher than my settings. Very dry here so I've been dealing with humidity problems for 20 years. My basement is cool at 52F right now and can get down to 40 or so in the deep of winter when the rh in the house is around 10%. Even with a 600w HPS going the fan only kicks in once an hour for a few minutes. The room is half full of plants in early flower so that keeps the rh up around 60% now. i'll want it lower when the buds get bigger so I don't get bud rot.

I've just learned to feed less when the rh is low or the plants burn easy. For about 3 months in the summer the rh is around 60% but the rest of the time it's dry as a popcorn fart.

If you humidify the air in the room then when your fan sucks air out of the tent it will be pulling in moist room air and help keep your rh up better. With the humidifiers in the tent it's sucking all your nice moist air out and bringing in drier air so the rh drops of course.

Better problem than living where the outside rh is 80+% all the time and having to lower it.

Yes I have a 6”ac infinity fan inside the tent running all the time extracting hot air out.

DoubleAtotheRON · Apr 23, 2022

lusidghost said:
I built a DIY humidifier with a three disk ultrasonic mist maker, a float for it, a 12" waterproof fan, an Inkbird humidity controller and a tote. I only have to fill it up ever few days and it puts out a ton of mist.

lusid's Cave of Blunder & Husky Hut

Same roots as yesterday.

www.rollitup.org

Do you not get that white dust from the ultrasonic humidifiers?, or are you using RO water or condensate? My well water is hard, so I have to use condensate water.

Bukvičák · Apr 23, 2022

Terpyderpy1717 said:
I have a 6” ac infinity exhaust fan inside the tent extracting air out. I have the controller set to go off whenever temps or rh get too high/low. I have a cheap setup outside with a fan sitting in front of ducting to bring cooler air from outside the room into the tent. (There is a filter on the ducting, I at least did that) lol. And I have 2 oscillating fans inside the tent with one blowing on the drivers of the light only when the light is on

So you are taking fresh air from other room? You probably do not need fan sitting in front of ducting, exhaust fan is ussually more than enough. If you have ducting to bring the air in you can just change its possition to suck air from humidifer. But at the end it will be for nothing… if your environment is hot and you are 6th week of flower, rising humidity may help a litlle with your necrosis fan leaves, but it also help botrytis to grow. I would rather dim the light a litlle and hype the exhaust in order to lower the temp as much as possible. Good luck!

Terpyderpy1717 · Apr 23, 2022

DoubleAtotheRON said:
Do you not get that white dust from the ultrasonic humidifiers?, or are you using RO water or condensate? My well water is hard, so I have to use condensate water.

I use distilled water. No issues.

OldMedUser · Apr 23, 2022

Terpyderpy1717 said:
Yes I have a 6”ac infinity fan inside the tent running all the time extracting hot air out.

There ya go. You'll never get your rh up with the humidifiers in your tent. I have a small tent upstairs in a spare bedroom for vegging etc but only use a small COBLED and my DIY one with up to 11 9w LED bulbs with the globes popped off. Once they get big enough they go downstairs to my main grow room which is 9x7x6.5'h and right now the plants are taking up about 5x4' of that space so running a 600W SHPS on my Light Rail to cover that much space. Thinking about moving up to 1000w but my light meter says they are getting lots of light even when it's at one end or the other so it would be overkill I'm sure. I burn a little alcohol lamp in there for extra CO2 during the stretch so keeping the temp up over 80F. It gets the CO2 up over 1250ppm in about 15 min according to my CO2 controller readings. The plants seem to love it.

:peace:

beansin · Apr 23, 2022

issue with moving allot of air permanently in a small space is keeping humidity up.
if the outside air is low in rh already then only way i can think to fix this is to add humidity to the room your in taking from .
if you put the humidifier in the tent all the humidity is being sucked out faster then it can build up
or reduce air flow and add ac to maintain temp

CWF · Apr 23, 2022

I must have neg pressure in my space at all times for odor control, so I also run a 6" fan extracting the space 24-7. You're just going to have to humidify best you can, as it is a trade-off.

My area is quite humid, so my issue is DE-humidifying the space. So I try to control the room the space is drawing air in from, i.e. the "lung" room, and put a good-sized de-humi in there.

I like the idea of the swamp cooler. Maybe a "lung" room approach? Just a thought.

lusidghost · Apr 23, 2022

DoubleAtotheRON said:
Do you not get that white dust from the ultrasonic humidifiers?, or are you using RO water or condensate? My well water is hard, so I have to use condensate water.

The mist maker's instructions said don't use RO or distilled water. I haven't seen it on anything other than a few leaves that it was blowing on, so I repositioned it against a wall and haven't noticed any dust.

BK was talking about these things. He just got a humidifier and hasn't used them yet I don't think, but I'm going to give them a try.

https://www.amazon.com/dp/B00EW1QLW4

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