How to spec a humidifier

My grow room is now sealed with co2 and I have dual hose portable ac units going.

At the beginning stages of growth the plants aren’t producing enough water vapor for me to get vpd in range.

My ac unit says in the description “max dehumidification 1.3l/h”

I have 3 of these ac units.

Do I need to source a humidifier that can produce over 3.9l per hour of mist to increase the humidity over what the ac units take out or is it very unlikely the ac units will ever get to their max dehumidification?

My humidity is 20% atm with the ac units going

Anyone here know anything about this?

These work well. I use a 5-disc in my 4x8x8. Could easily get by with a 3-disc. They might be on Amazon also.

TintEastwood said:

These work well. I use a 5-disc in my 4x8x8. Could easily get by with a 3-disc. They might be on Amazon also.

What size Ultrasonic Mist Maker do I need? - The House of Hydro

Mist maker comparison chart and buying guide. Everything you need to know about ultrasonic mist makers and how to choose the right size fogger.

www.thehouseofhydro.com

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Yeah I’m looking at those on house of hydro. But I don’t want to buy a 12 disk one if I only need a 4. And I don’t wanna buy a 4 to find out I need a 12 As either way I’m wasting money if you know what I mean.

Do you know how to work out how much an ac unit removes?

SamWE19 said:

Yeah I’m looking at those on house of hydro. But I don’t want to buy a 12 disk one if I only need a 4. And I don’t wanna buy a 4 to find out I need a 12 As either way I’m wasting money if you know what I mean.

Do you know how to work out how much an ac unit removes?

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For sure. What size is the space you need to humidify?

When needed...What size DE-huey do you use?

TintEastwood said:

For sure. What size is the space you need to humidify?

When needed...What size DE-huey do you use?

Click to expand...

The space isn’t that big maybe 7m x 7m x 2m.
It’s a completely sealed room so it’s all about the amount the ac units remove I guess.

I have a 50l dehumidifier which works more than enough for 90 plants

SamWE19 said:

The space isn’t that big maybe 7m x 7m x 2m.
It’s a completely sealed room so it’s all about the amount the ac units remove I guess.

I have a 50l dehumidifier which works more than enough for 90 plants

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Thats a nice size room.
Hopefully someone like @Renfro with big grow experience will chime in....

Best wishes on all your grows. :

Swamp cooler / evaporative cooler.

Renfro said:

Swamp cooler / evaporative cooler.

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Was looking At those bud but they don’t say the output in ml/hr so I can’t work out if they produce enough to produce more than the ac units are taking out

They put out more than any humidifier that you will find. They cool the air by adding water.

Renfro said:

They put out more than any humidifier that you will find. They cool the air by adding water.

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Alright cheers I thought they may put out less that’s ideal then. Found a huge one for a decent price so just need to check with manufacturer that it can be used with an external humidistat