Humidity control issues. Help

Armyofsprout

Armyofsprout

Well-Known Member
Hey everyone. I have a 2x4x7 grow tent that I cannot get my humidity low enough in my tent. I’m sure it’s because of my AC unit keeping the temps in the room down and that cold humid air bringing the humidity up some, but I just started week two of flower and I wanna make sure I have the best buds later on down the road.

I currently have two small dehumidifiers on the tent. One is a small mini humidifier and the other is just a dry Non powered dehumidifier. My levels are ranging from 55%-70% fluctuating. I’m trying to be around 40-50 consistently.

New and Improved Eva-dry E-333... https://www.amazon.com/dp/B000H0XFCS?ref=ppx_pop_mob_ap_share

SEAVON Electric Mini Dehumidifier, 1500 Cubic Feet (156 sq ft) Portable and Compact 500ml(16 oz) Capacity Quiet Mini Dehumidifiers for Basement, Bedro https://www.amazon.com/dp/B07KF6Y19V/ref=cm_sw_r_cp_apip_dL97Tfienb47M


I really don’t want to buy a huge dehumidifier that takes up most the tent but is there any options?

I also don’t want to spend a huge a lot of money. I can return both things I have now and reinvest those funds into a better humidifier. But for my size tent are there any recommendations? These two were rated for my tent but they aren’t working as well.
 
Beantown_greentown

Beantown_greentown

Member
Armyofsprout said:
Yeah I have an intake. Good because a larger dehumidifier won’t fit in my tent
Click to expand...
Make sure you filter that intake you wouldn’t believe the shit powdery mildew grows on. Ugh. Filter in blast it out however. Mine goes right out the side of my house and stinks up the entire neighborhood. Lol . One neighbor was complaining so I got a couple filters and tossed em in my 20x20 room. Not trying to piss off the neighbors.
 
SheeshM

SheeshM

Well-Known Member
I couldn't get any results out of the small and cheap DH devices. I use a full DH outside the tent and run a 4" duct from the DH output to a tent port. I connected the DH to an inkbird RH controller with a sensor in the tent. Works great and will give you whatever RH you set the inkbird at. The inkbird can control a humidifier and dehumidifier but I just use the DH portion.

Important: DH works by heating and drying the air. You need to capture the warm, dry air from the DH and direct it into your tent. This means you may need a small AC piping cool air into your tent to fight the warm DH air. Not very efficient but it works and it's way better than worrying about bud rot or WPM.
 
Armyofsprout

Armyofsprout

Well-Known Member
Beantown_greentown said:
Make sure you filter that intake you wouldn’t believe the shit powdery mildew grows on. Ugh. Filter in blast it out however. Mine goes right out the side of my house and stinks up the entire neighborhood. Lol . One neighbor was complaining so I got a couple filters and tossed em in my 20x20 room. Not trying to piss off the neighbors.
Click to expand...
my intake is currently filtered with cheesecloth. I was getting a shitload of dust and stuff being sucked through at first so I filtered it when I first set up. I also have a carbon filter on my exhaust for smell so that isn’t an issue either.
 
Flowki

Flowki

Well-Known Member
A good humidifier will work but you should also check that you are maintaining the correct temps and that you are not excessively watering so that needless evaporation is also adding to the issue. If the huey has to work over time it is wasting electricity, wearing it out quicker and also adding heat that you may not want in the summer.

If you don't have a decent means of thermally controlling your air in or out take then you may be running at lower temps as a result (due to fan setting limitation) bringing in added humid air.

Also be sure you are not leaving standing water in dishes or buckets within either room. If you have no choice but to do so, like a res, cover it with a lid, bin liner or what ever, make it air tight as possible. You'll see just how much evaporation occurs on the under side of the cover when you lift it after 24 hours, it's substantial enough to care about.
 
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Armyofsprout

Armyofsprout

Well-Known Member
SheeshM said:
I couldn't get any results out of the small and cheap DH devices. I use a full DH outside the tent and run a 4" duct from the DH output to a tent port. I connected the DH to an inkbird RH controller with a sensor in the tent. Works great and will give you whatever RH you set the inkbird at. The inkbird can control a humidifier and dehumidifier but I just use the DH portion.

Important: DH works by heating and drying the air. You need to capture the warm, dry air from the DH and direct it into your tent. This means you may need a small AC piping cool air into your tent to fight the warm DH air. Not very efficient but it works and it's way better than worrying about bud rot or WPM.
Click to expand...
hmmm I think I’ll start with a larger dehumidifier and go from there. I’ll place it outside the tent and see how it works. I think with the powerful exhaust I have that maybe it’s having trouble heating the air inside the tent. So if I can bring the entire room down that should help.

here’s my exhaust fan for reference. This fan was definitely an amazing purchase.


AC Infinity CLOUDLINE T6, Quiet... https://www.amazon.com/dp/B074XBXFPD?ref=ppx_pop_mob_ap_share
 
Armyofsprout

Armyofsprout

Well-Known Member
Flowki said:
A good humidifier will work but you should also check that you are maintaining the correct temps and that you are not excessively watering so that needless evaporation is also adding to the issue. If the huey has to work over time it is wasting electricity, wearing it out quicker and also adding heat that you may not want in the summer.

If you don't have a decent means of thermally controlling your air in or out take then you may be running at lower temps as a result (due to fan setting limitation) bringing in added humid air.

Also be sure you are not leaving standing water in dishes or buckets within either room. If you have no choice but to do so, like a res, cover it with a lid, bin liner or what ever, make it air tight as possible. You'll see just how much evaporation occurs on the under side of the cover when you lift it after 24 hours, it's substantial enough to care about.
Click to expand...
temps are auto controlled via my exhaust fan. That isn’t an issue. Also have a window AC unit keeping temps down which may be bringing up humidity some. Here’s some pics.

my watering is at a min also. I water probably every 5 days.
 

Attachments

Flowki

Flowki

Well-Known Member
Armyofsprout said:
temps are auto controlled via my exhaust fan. That isn’t an issue. Also have a window AC unit keeping temps down which may be bringing up humidity some. Here’s some pics.

my watering is at a min also. I water probably every 5 days.
Click to expand...
I see, well in that case the de-hue is not good enough. However under cob/led you can run higher ambient being the general accepted info, around 80/85 If I recall. With that, you may be able to get away with higher humidity but it's something you'd need to research into. Increasing temps will increase evaporation/respiration so higher spikes in humidity will occur, resulting in the square rout of again needing a better de-hue. But, knowing that you ''can'' get away with higher humidity at times will rest the mind a bit. I think the biggest issue with constant high humidity is the lights off hours. Temp drops a little, you get a large humidity spike and condensation effect. You need a good huey and 24 hour air circulation across the entire canopy to keep that in check, not doing that is one of the ripe situations rot seems to get a foot hold in. Poor airflow in the corners of the grow is another, as condensation settles there.
 
Armyofsprout

Armyofsprout

Well-Known Member
Flowki said:
I see, well in that case the de-hue is not good enough. However under cob/led you can run higher ambient being the general accepted info, around 80/85 If I recall. With that, you may be able to get away with higher humidity but it's something you'd need to research into. Increasing temps will increase evaporation/respiration so higher spikes in humidity will occur, resulting in the square rout of again needing a better de-hue. But, knowing that you ''can'' get away with higher humidity at times will rest the mind a bit. I think the biggest issue with constant high humidity is the lights off hours. Temp drops a little, you get a large humidity spike and condensation effect. You need a good huey and 24 hour air circulation across the entire canopy to keep that in check, not doing that is one of the ripe situations rot seems to get a foot hold in. Poor airflow in the corners of the grow is another, as condensation settles there.
Click to expand...
thanks. I just ordered a 30 pint dehumidifier now. hopefully that’s all I needed. I’m currently already running LED for my grow

Vremi 30 Pint Energy Star Dehumidifier for Medium to Large Spaces and Basements-Quietly Removes Moisture to Prevent Mold and Mildew, White https://www.amazon.com/dp/B07JNZFRC8/ref=cm_sw_r_cp_api_i_mSdqDb5F4ZJ4V
 
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