Help with dehumidifying multiple grow tents in same room

Hi I'm trying to do a couple tents in one room as a perpetual grow but I'm wondering if I would need a dehumidifier for each individual grow tent? And how big should would they have to be? Any recommendations on size or model would be appreciated it's 3 grow tents one is 4x4 , and two 3x3's. The 4x4 is for flowering and the other two for veg and clones. Right now I'm battling high humidity when the lights are off. Temps get to low 50's°f sometimes 40's°f

Are you exhausting the air from the tents outside the grow room, or is the air recycling?
How many plants do you have, and how much water do you give each plant? Or if you still don't know, what are your pot sizes?
In general, you would water with 30% of the pot size every few days (roughly)

Since plants transpire 90% of water, you should get a dehumidifier with a capacity equivalent to the amount of water you give your plants.
For example: 10 plants and each gets 3 liters of water, you would need a dehumidifier with a capacity of 30 liters / 24h

Of course the plants don't transpire in 1 day, but you need to dehumidify the natural humidity in the room as well, so you want that extra capacity.
A more powerful dehumidifier won't hurt, it will dehumidify faster and you don't have to run it all day.
If you are from EU i can suggest some dehumidifiers, otherwise someone else can suggest you hopefully.
Just make sure the dehumidifier has a humidity setting of minimum 30% up to 80%, and make sure it has a drainage hose option, so it can run in continuous mode with an external drainage, rather than using the built-in reservoir. And if this room is close to you, they will make noise so you might look for a fan speed adjustment as well.

If all the plants grew in the same stage you could get 1 single powerful dehumidifier for the whole room. But since you have separate tents for veg and flower, i would suggest getting few smaller dehumidifiers in each tent, because you need different humidity for each stage. But in theory you could get away with only 1 powerful one, if you adjust the exhaust fan speeds for each tent to control the humidity. But in this case i would honestly get a semi-industrial dehumidifier so it doesn't get overloaded, maybe something like this https://uk.trotec.com/products-services/machines-highperformance/water-damage-restoration/
But for multiple smaller ones, something like these https://uk.trotec.com/products-services/machinery-homecomfort/dehumidification/
Keep in mind if you get only 1 dehumidifier and adjust the exhaust fans for each tent, you still might get issues with temperature so it's not so reliable.
Few smaller dehumidifiers in each tent would be my choice.

Write down your plan with the number of plants and pot sizes, i'll try to help you with calculations.

P.S - In my country a dehumidifier with a capacity of 10l/24h was 200€, and the one with 30l/24 was 250€. The wattage was only 100w difference, and the noise decibel was the same. So in my case it was really worth getting the more powerful one for only 50€ more.

monkeeboi69 said:

Hi I'm trying to do a couple tents in one room as a perpetual grow but I'm wondering if I would need a dehumidifier for each individual grow tent? And how big should would they have to be? Any recommendations on size or model would be appreciated it's 3 grow tents one is 4x4 , and two 3x3's. The 4x4 is for flowering and the other two for veg and clones. Right now I'm battling high humidity when the lights are off. Temps get to low 50's°f sometimes 40's°f

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Gotta get the night temps up at least high 60s for a dehumidifier to work, But one 50-70 pint can handle that easy.

I'm with thumper you gotta get those temps evened out some. Why is it so cold? Are you running your lights on at night?

Others have already given you some good advice. You'll run into non stop problems with temps that low-PM will flourish, plants will begin getting nutrient deficiencies and you'll see slow growth in general. Get that room up into the 70s, and get a single dehumidifier for the entire room. In addition, you need good air circulation within each tent, underneath and above the canopy. You want to be able to look in the tent and see every single leaf all over each plant moving at least a little-that will help to lower the humidity within the canopy. You also need good air exchange in each tent, which means a good strong vent fan. That way, you constantly bring in that good dehumidified air and circulate it in each tent. It's also worthwhile to defoliate underneath the canopy-you don't need to lollipop, just clear out the fan leaves that don't get any light. That way your fans under the canopy can penetrate to the opposite side of the tent, and it will also reduce the amount of water the plants are transpiring. For your needs, look into a "50 pint" or so humidifier. You'll need to set it at 50% and run it constantly, so either be prepared to manually empty it every 4-5 hours, or most of them have a tube you can just set into a drain-if you have that option. Dehumidifiers help warm the space, but they are no substitute for a heater. Be sure you know which outlets go to which breaker so you don't overload any of your circuits-keep the load at 80% or less, so if you have 15 amp breakers, don't run more than 13 amps on them. Sorry if this is all remedial information for you, hopefully some of it helps! Good luck

Dehumidify the room or rooms the tents are in. Not each tent separately. Period.

Good news is a decent dehumidifier raises temps