Need humidity/humidifier advice

So, the room that contains my current tent is climate controlled and while we occasionally get some brief humidity, it’s generally 50-55% RH (occasionally dropping to 45%) in the space and temps are pretty consistently between 70°-78°F in the tents. Now I’m planning to add a second tent in order to have a veg tent and a flower tent. I’m trying to figure out if I should get one big humidifier and run it in the room that will contain both tents or should I get small, individual humidifiers for each tent? I HATE the idea of giving up tent real estate to a humidifier (or anything besides plants) but I will if I have to.

I’m tentatively thinking about a large room humidifier in the outer room and set it to the highest safe humidity for flowering and then trying the wet towel trick in the veg tent (4x4). If that didn’t raise humidity enough, I’m wondering if a small humidifier would work to give the veg tent (4x4) the little extra humidity it needs?

I’m especially concerned about a humidifier inside a flower tent because of the mist they put out to raise humidity - I’m afraid the moisture will get on the buds and cause botritus. So, I’m wondering what some more experienced folks would do, in this situation?

 

[Simplicio]

So, the room that contains my current tent is climate controlled and while we occasionally get some brief humidity, it’s generally 50-55% RH (occasionally dropping to 45%) in the space and temps are pretty consistently between 70°-78°F in the tents. Now I’m planning to add a second tent in order to have a veg tent and a flower tent. I’m trying to figure out if I should get one big humidifier and run it in the room that will contain both tents or should I get small, individual humidifiers for each tent? I HATE the idea of giving up tent real estate to a humidifier (or anything besides plants) but I will if I have to.

I’m tentatively thinking about a large room humidifier in the outer room and set it to the highest safe humidity for flowering and then trying the wet towel trick in the veg tent (4x4). If that didn’t raise humidity enough, I’m wondering if a small humidifier would work to give the veg tent (4x4) the little extra humidity it needs?

I’m especially concerned about a humidifier inside a flower tent because of the mist they put out to raise humidity - I’m afraid the moisture will get on the buds and cause botritus. So, I’m wondering what some more experienced folks would do, in this situation?

I follow the Vapor Pressure Deficit chart, and keep the humidity in the mid 60s or higher to promote fast growth, sprout to harvest, and have never had any problems in DWC.

Unfortunately, unless you keep the room temp and tent temp about the same, humidifying the room won't work very well.
Even a 5 F higher temp inside the tent will greatly lower the humidity inside compared to outside.
Blowing air thru a pipe, into the tent, from a humidifier outside the tent won't work either, because there is too much condensation inside the pipe, and water annoyingly drips out.
The most convenient thing I've found that works is a top fill, ultrasonic humidifier, with a fan behind it to disperse the low velocity mist it puts out.
But currents of high humidity air will kill leaves that they blow directly on, so something must be done to prevent direct contact between mist and leaves.
When the plants are small, storage bin lids can be positioned to protect leaves.
When they're larger, those lids can be situated to create a chimney up against tent walls, with a fan at the bottom to blow humid air straight up.
A chimney constructed from pvc tubing and panda film should work well.
As harvest nears, the humidity caused by plants' transpiration might be high enough, if exhaust fan speed isn't too high.

Forced air, evaporative type humidifiers put out less lethal fumes, and again top fill is best.
Unfortunately, these can't get the humidity very high, but usually disperse the humid air much, much better than ultrasonic.
I play around with both types, depending on how much room the plants leave inside the tents.
I've even set humidifiers on 4 ft high plant stands to get humid air above the plants, but that might be carrying things a bit too far.

 

[DTOM420]

I follow the Vapor Pressure Deficit chart, and keep the humidity in the mid 60s or higher to promote fast growth, sprout to harvest, and have never had any problems in DWC.

Unfortunately, unless you keep the room temp and tent temp about the same, humidifying the room won't work very well.
Even a 5 F higher temp inside the tent will greatly lower the humidity inside compared to outside.
Blowing air thru a pipe, into the tent, from a humidifier outside the tent won't work either, because there is too much condensation inside the pipe, and water annoyingly drips out.
The most convenient thing I've found that works is a top fill, ultrasonic humidifier, with a fan behind it to disperse the low velocity mist it puts out.
But currents of high humidity air will kill leaves that they blow directly on, so something must be done to prevent direct contact between mist and leaves.
When the plants are small, storage bin lids can be positioned to protect leaves.
When they're larger, those lids can be situated to create a chimney up against tent walls, with a fan at the bottom to blow humid air straight up.
A chimney constructed from pvc tubing and panda film should work well.
As harvest nears, the humidity caused by plants' transpiration might be high enough, if exhaust fan speed isn't too high.

Forced air, evaporative type humidifiers put out less lethal fumes, and again top fill is best.
Unfortunately, these can't get the humidity very high, but usually disperse the humid air much, much better than ultrasonic.
I play around with both types, depending on how much room the plants leave inside the tents.
I've even set humidifiers on 4 ft high plant stands to get humid air above the plants, but that might be carrying things a bit too far.

Thanks for the reply! The temp in the room and in the tent ARE about the same. I run some pretty efficient LED lights and I do a lot of air exchange. I’ve never checked the outside room temp but I’d be surprised if it was more than 5° off the temp in the tent. I guess I’ll try a 4 gallon humidifier with a humidistat. I’m wanting to follow the VPD chart as well and I’m just trying to figure out how to do that, since air is dry here much of the time.

I found a great video on building a humidifier from a guy in Colorado with a popular YouTube channel but I feel like it will create too much vapor and was probably meant for a real grow room or a very large tent - not a 5x5 or 4x4

FWIW, here’s a link to it: