How to Size a Dehumidifier For Your Hydroponic grow tent?

Factors To Consider Along With Your Dehumidifier

Are you running a air-conditioner? If you have a sealed room with a/c, the a/c will remove some of the moisture itself.

Check your a/c to see how many pints per day it removes, and subtract that from your daily dehumidifying needs.

But, remember that your a/c will only be running occasionally. So when calculating size, make sure to play it safe and get a larger dehumidifier than you think you need. Under sizing is a common mistake newer growers tend to make.

If using CO2 in your room, it will increase the humidity levels. Also, if you are exhausting air from your room, the effectiveness of the dehumidifier will decrease. In either situation, consider to increase dehumidification performance.
Sizing a dehumidifier for a drying room

If you are sizing a dehumidifier for your indoor drying room, you may be under the impression that finding a huge dehumidifier can speed up the drying process.

You may be right, a dehumidifier will certainly dry out your buds fast. But this actually isn't what you want!

When it comes to drying your cannabis, low and slow is the mantra you should live by. Trying to dry out your buds as fast as possibe will suck the flavor, potency, and enjoyment from them.

But, if you have a decent sized drying room, you may need some level of dehumidification. You need to know the wet weight going in, and the dry weight coming out. Then, simply divide by 2. Here is an example:

If you bring in 1,000 pounds of wet cannabis, you can expect it to weigh around 800 pounds dry (200 lbs of water weight).

Dividing this figure by two gets you 400, which is the pints/day needed from your dehumidifier. Then, you need to know the condition you are drying in, which should e around 65-70 degrees fahrenheit. If you don't want to take any risks, reach out to us and we can make sure you get exactly what you need.
Evaluating Your Grow Room's Dehumidification Needs

To properly size a dehumidifier for your indoor grow house, first consider the specific environment you'll be working in and the daily operations you'll be running. For example:
How much water are you giving your plants every day?
Are you running an air conditioner for temperature management? If so, what is its dehumidification rating? Check your particular setup; it should indicate how many pints of water it removes from the air per day.
Are you using CO2 in your grow room or grow tent ?

Below are some key factors to keep in mind when determining the ideal size for your grow room dehumidifier:
Gallons Per Day

To determine how much moisture buildup will occur in your grow room, work out a rough estimate of the number of plants in your space and how much water they'll receive. For example, 30 plants that receive 1 gallon of water per plant per day means a water input of 30 gallons.

Each gallon holds 8 pints, which would be a total of 240 pints of water per day. This is converted into pounds per hour; 1 pint is equal to approximately 1 pound of moisture. Therefore, in this example, 240 pints of water would equal 240 pounds of water per day. This means 10 pounds of moisture per hour is being removed over 24 hours.

Plants transpire roughly 97% of the water they're given, so pinpointing the amount of watering you plan to do is an easy way to approximate how much moisture will need to be removed each day.
Temperature Range

Different types of grow rooms and plants will require different temperature ranges to thrive, and different growing cycles will require different temperature ranges.

For instance, a cloning room may start out at 75 °F degrees, while a flowering room for the same plant may be held at 78-80 °F. And a drying and curing room may see temperatures closer to 65°F degrees.
Best Dehumidifier For 2×2 Grow Tent: 

Eva-Dry E-333 Renewable Mini Dehumidifier

This work best if you've a grow tent or a room that's not too big. Now its manufacturer claims that this mini device will work with an area that's 333 square meters big but I'd say not really.

This is best for 2x2 grow tents, so don't get this if you plan on setting up a big garage as your indoor garden.

It's said to remove 4-6 ounces of humidity in 2-4 weeks. That's pretty much an ounce or two a week, so again this is only good for a small grow tent or box.

When it comes to how long it should last, I find it great. This piece is rechargeable. It doesn't really work with batteries but let me explain further.

This device works with a blue silica gel that serves as the moist absorber. This'll last about 4 weeks, depending on how damp the area is.

Now don't worry about how it only last for a month because true to its name that it is renewable, you just have to recharge it until the gel easily seen on its face turns pink. Amazingly, its manufacturer claims that you can keep this for ten years.

Best Dehumidifier For 4×4 Grow Tent: 

Air Choice Portable Electric Dehumidifier

Best for small spaces like a 4x4 grow tent, this dehumidifier can draw up to 250ml of moisture in a day. It has an auto-shut feature once it reaches its capacity, so it works great if your grow area is even in your living room.

What's also great with this dehumidifier is how quiet and compact it is. This can set the relative humidity level of your space from 45%.

Its LED indicator also lets you know if you should be worried whether water will be spilling out soon.

If you don't own a grow tent, as long as your space is no bigger than 220 square feet, you're good.

Because of how small this dehumidifier is, this is definitely not suitable for big spaces.

If put in an area that's bigger than a 4x4 tent, you most likely won't see any improvement on the humidity level of your grow area.
Where To Place Dehumidifiers In Your Grow Area

Ideally, if your grow area requires multiple dehumidifiers, they should be well-spaced.

I've to stress that placing dehumidifiers on the right areas in your room or tent is really important to make sure that your plants benefit from what they are for in the first place.

Putting it in the wrong area can affect your harvest if you'll be growing crops or the plants' longevity in general.

For reducing the room's humidity, it's always best to place the dehumidifier in the middle of the room on the same level as the lights especially if you only need one.

With all the available types of dehumidifiers available, you can choose to have it hung that way or on the floor if your grow area's ceiling is low.

If you only have one dehumidifier and it's in the middle of the room, then you shouldn't have any issues when it comes to airflow.

If you've multiple dehumidifiers, then just make sure that they do not go against the walls. Just remember to check your dehumidifier's manual for the exact spacing instructions.