Humidity

[TreeFiddy350]

I’m having issues keeping my humidity higher since the cold weather is starting to get here. I have my air duct blowing the hot air out of the window in the bedroom (I have a cutout in plywood in the window for the air duct). I have a 80$ humidifier in there and not sure what to do to get more humidity in there. Do you think I should add ANOTHER humidifier? Right now the humidity gets about 40 during the night and no more than 67-70 at its high. Suggestions?

 

[hotrodharley]

I’m having issues keeping my humidity higher since the cold weather is starting to get here. I have my air duct blowing the hot air out of the window in the bedroom (I have a cutout in plywood in the window for the air duct). I have a 80$ humidifier in there and not sure what to do to get more humidity in there. Do you think I should add ANOTHER humidifier? Right now the humidity gets about 40 during the night and no more than 67-70 at its high. Suggestions?

Light in air cooled reflector. Exhaust that heat outside. Less air exchange in the tent.

 

[TreeFiddy350]

Light in air cooled reflector. Exhaust that heat outside. Less air exchange in the tent.

The heat is getting exhausted from the tent, through air duct to outside of the window. What do you mean by light in air cooled reflector

 

[hotrodharley]

The heat is getting exhausted from the tent, through air duct to outside of the window. What do you mean by light in air cooled reflector

Put your light in an air cooled hood and temps immediately become easy to handle in the tent. Air into the hood by fan, cools bulb and exits to be exhausted outside the growing environment . OK?

Then you need very little air exchange inside your tent allowing your humidifier to work . Just like I'm sitting 6' away from.

The air cooled hood is the key.

 

[TreeFiddy350]

Put your light in an air cooled hood and temps immediately become easy to handle in the tent. Air into the hood by fan, cools bulb and exits to be exhausted outside the growing environment . OK?

Then you need very little air exchange inside your tent allowing your humidifier to work . Just like I'm sitting 6' away from.

The air cooled hood is the key.

The air duct is connected through inline fan/ carbon filter, runs through light, then out through tent through window.

 

[TreeFiddy350]

Do you think it’s my fan? Not inline fan, but just a big circle fan. It’s kinda big. It’s being replaced today once my 4 clip on fans come in the mail today

 

[shawnery]

Are you running your exhaust 24/7? I have a similar issue and I live in a very humid environment. I ended up putting my fan on a timer. That allowed my humidity to swing from 55 to 75 and it worked very well.

 

[Moldy]

I grow (flower) in 20% RH all of the time or for over 12 years lol. Sometimes it goes up to 30% after I water a bunch but always returns to 20%. I like fresh air and it's easier to keep my small room cool as I'm using an open hooded DE @ 1000 W. They sure drink a lot of water though with some needing water every day. I do veg in a closet and that's more like 30-40% RH but have vegged in 20% too without difficulty.

I wouldn't know what to do with all of your humidity.

 

[shawnery]

VPD at those numbers in veg are way off but I do agree you can grow great weed outside of these numbers.

 

[TreeFiddy350]

Are you running your exhaust 24/7? I have a similar issue and I live in a very humid environment. I ended up putting my fan on a timer. That allowed my humidity to swing from 55 to 75 and it worked very well.

No, everything is on a 18/6 time. Whenever the lights are off, it gets to regular humidity (have a dehumidifier that kicks on once it gets to a certain point) it has just been the last couple days that the humidity drops.

 

[shawnery]

No, everything is on a 18/6 time. Whenever the lights are off, it gets to regular humidity (have a dehumidifier that kicks on once it gets to a certain point) it has just been the last couple days that the humidity drops.

It might help to run your exhaust on an extra timer so during it's on time you can control humidity better?

 

[TreeFiddy350]

It might help to run your exhaust on an extra timer so during it's on time you can control humidity better?

So I don’t need that running when the lights are on?

 

[shawnery]

So I don’t need that running when the lights are on?

I've spoken to and read many posts of people running them on timers just for this reason. I have mine hooked up to a temp controller for day time operation. I set my temp controller set to 75 and let it swing to 78. That does a great job of keeping it in an acceptable range.

No matter how much humidity I added it was never enough till I started messing with exhaust timing.

 

[SPLFreak808]

Honestly, having the RH in the 35-45 range along with temps no higher than 75f has always shown me some killer results (tighter flower, different smell and usually looks more trichy) its very rare for me to find a plant that can not take it during flower even from seed, might need to water more often with some run-off though.

If you insist on higher RH, sealing up that bulb with an air cooled hood was probably the best idea, bare hid bulbs can drop humidity like a mofo depending on the output, if it has an exhaust it wont really give the humidifier a chance to humidify, it would be no surprise.

Lights on during night hours will increase humidity but will usually drop during day time,
when doing things manually like that, its all about making it work in your current environment.

 

[TreeFiddy350]

Honestly, having the RH in the 35-45 range along with temps no higher than 75f has always shown me some killer results (tighter flower, different smell and usually looks more trichy) its very rare for me to find a plant that can not take it during flower even from seed, might need to water more often with some run-off though.

If you insist on higher RH, sealing up that bulb with an air cooled hood was probably the best idea, bare hid bulbs can drop humidity like a mofo depending on the output, if it has an exhaust it wont really give the humidifier a chance to humidify, it would be no surprise.

Lights on during night hours will increase humidity but will usually drop during day time,
when doing things manually like that, its all about making it work in your current environment.

Perfect! Thanks man. I appreciate your answer as well as everybody in the forums. This is BY FAR the best community for growing marijuana and topics of such. I’ve been on a few and this def has the most knowledgeable/ quick responses. I appreciate everybody! I’m gknna try to switch up my inline fan time and see how that works

 

[TreeFiddy350]

Update. I turned the inline fan off for awhile and it got too hot. Here is an update. Disregard the temp. It’s currently dropping as we speak. I don’t understand why the humidity readers say that the humidity is like 30%, but it shows humidity is high

 

[shawnery]

I have that same one and it always reads about 20% off compared to two other smaller versions from a different company and the controller for my humidifier as well.

I dont know if its mine or the company but if your plants show effects of low humidity than it must be right?

 

[TreeFiddy350]

I have that same one and it always reads about 20% off compared to two other smaller versions from a different company and the controller for my humidifier as well.

I dont know if its mine or the company but if your plants show effects of low humidity than it must be right?

From the pictures above, does it look like they have issues from low humidity?

 

[NanoGadget]

Sounds like your heat management is on point, so if you RH still isn't where you want it a second humidifier may be your best option. Or do what i did when i was in the same situation... retire the one you are usin3g from your grow space and buy a bigger, nicer one with higher capacity and a humidistat

 

[TreeFiddy350]

Sounds like your heat management is on point, so if you RH still isn't where you want it a second humidifier may be your best option. Or do what i did when i was in the same situation... retire the one you are usin3g from your grow space and buy a bigger, nicer one with higher capacity and a humidistat

Dang, I literally bought this one a couple weeks ago. It was $60.I figured it would def be able to get the humidity up since it was so big and whatnot. AirCare D46 720 4-Speed Tower-Style Evaporative Humidifier https://www.amazon.com/dp/B0012KO7DS/ref=cm_sw_r_cp_api_HDXXBbV4EYFTW