Grow Tent Or Grow Room Dehumidifier | How to Choose the Right Size

Sizing your grow room dehumidifier correctly to keep your relative humidity in check. Learn how to determine the right size for your setup, and our top 3 recommendations for the best dehumidifier for your grow tent or grow room.

Are you thinking of growing plants indoors soon?

Our Top Picks For Grow Tent or Grow Room Dehumidifier for 2021

Products
Best for Small Grow Tent
Eva-Dry Wireless Mini Dehumidifier, White (E-333)
Best for Large Grow Tent
Inofia 30 Pint 1500 SQ FT Home Dehumidifiers for Basements Bathroom Garage Laundry/Store...
Best for 4x4 Grow Tent
SEAVON Dehumidifier 35oz Dehumidifiers for Home 2600 Cubic Feet (285 sq ft) with 7 Color...
Name
Eva-Dry Wireless Mini Dehumidifier, White (E-333)
Inofia 30 Pint 1500 SQ FT Home Dehumidifiers for Basements Bathroom Garage Laundry/Store...
SEAVON Dehumidifier 35oz Dehumidifiers for Home 2600 Cubic Feet (285 sq ft) with 7 Color...
Prime
Best for Small Grow Tent
Products
Eva-Dry Wireless Mini Dehumidifier, White (E-333)
Name
Eva-Dry Wireless Mini Dehumidifier, White (E-333)
Prime
Best for Large Grow Tent
Products
Inofia 30 Pint 1500 SQ FT Home Dehumidifiers for Basements Bathroom Garage Laundry/Store...
Name
Inofia 30 Pint 1500 SQ FT Home Dehumidifiers for Basements Bathroom Garage Laundry/Store...
Prime
Best for 4x4 Grow Tent
Products
SEAVON Dehumidifier 35oz Dehumidifiers for Home 2600 Cubic Feet (285 sq ft) with 7 Color...
Name
SEAVON Dehumidifier 35oz Dehumidifiers for Home 2600 Cubic Feet (285 sq ft) with 7 Color...
Prime

Whether you want to be an indoor horticulturist or winter is simply coming, there are a few things that you should keep in mind to be successful.

Knowing the size of the indoor growing area that will fit your needs and whether a grow tent or box would work best with what you want to grow is very important.

One of the key items to success with indoor gardening is choosing the right dehumidifier size for your grow room or grow tent

A dehumidifier will help you control the humidity level in your grow area. This helps you ensure that your grow area will not have too much moisture to avoid moisture-related conditions like root tot and mold.

In this post, we’ll take a quick look at the three best dehumidifiers for grow tents or grow rooms.

I’ll make sure to cover everything you want to know about Your Dehumidification Needs and the best brands I found on the market for different grow tent sizes.

#1 Pick For Best Grow Room Dehumidifier 

Best Dehumidifiers For Grow Tent & Grow Rooms – Reviews & Buying Guide For 2021

  1. Eva-Dry E-333 Renewable Mini Dehumidifier
  2. Inofia Portable Dehumidifier With 4 Gallons Working Capacity
  3. ALROCKET Dehumidifier Small Dehumidifier For Up To 160 Sq Ft

1. Best Dehumidifier For 2×2 Grow Tent: Eva-Dry E-333 Renewable Mini Dehumidifier

Editor’s #1 Choice

Sale
Eva-Dry Wireless Mini Dehumidifier, White (E-333)
  • EASY TO USE: This mini dehumidifier is spill and mess free. Just hang and...
  • MINI DEHUMIDIFIER GOES A LONG WAY: Super dry dehumidifier unit lasts 20-30...
  • SMALL, SLEEK DESIGN: This portable small design lets you hang or...

When I started to test growing plants indoors, I only had about five plants that didn’t need much watering.

I used Eva-Dry E-333 Renewable Mini-Dehumidifier, and it worked wonderfully. It’s very remote as it doesn’t require any cords or even batteries to operate. Setting it up was effortless!

This works best if you have 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 2×2 tents (or smaller), 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. That’ll last about 4 weeks, depending on how damp the area is.

Now don’t worry about how it only lasts for a month because true to its name that it is renewable, you 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.

PROS

No need for electricity as it uses a moisture absorbing gel
Very portable and can be used in a small grow tent or grow box
5-year warranty if anything goes wrong

CONS

Not for use grow tents larger than 2×2
If the area is large, this dehumidifier is not effective in removing moisture
Need to recharge by replacing by getting new moisture absorbing gel packs


2. Overall Best: Inofia Portable Dehumidifier With 4 Gallon Working Capacity

Inofia 30 Pint 1500 SQ FT Home Dehumidifiers for Basements Bathroom Garage Laundry/Store...
  • 1500 SQ FT Dehumidifier: With removal capacity of up to 30 pints of water...
  • Easy-to-Use: With a humidistat, this smart dehumidifier will AUTO-STOP when...
  • User-friendly Drainage: This small dehumidifier will auto shut off when its...

This is ideal for growers who have got a space of up to 1500 square meters. It has a built-in water tank with a 1.8L capacity. It’s an intelligent device that’s easy to turn on and off with just one button, so it’s safe to say it’s very user-friendly.

This dehumidifier isn’t really as big as it sounds, but the amount of moisture and water it could extract may surprise you.

It’s very compact and efficiently works in medium-sized grow areas.

The good thing about this dehumidifier is that it comes with negative ion purification and an activated carbon filter. This means that aside from extracting moisture, it also ensures that the air in your area will be clean.

PROS

Very effective in removing moisture in a larger area up to 1,500 square feet
Digital user interface is simple to use
Able to control the level of humidity to the desired level

CONS

Have to remove the water when the water tank is full


3. Best Dehumidifier For 4×4 Grow Tent: SEAVON Dehumidifier 35oz Dehumidifier (285 sq ft)

SEAVON Dehumidifier 35oz Dehumidifiers for Home 2600 Cubic Feet (285 sq ft) with 7 Color...
  • ➤【HIGH EFFICIENT DEHUMIDIFICATION】SEAVON portable dehumidifier with...
  • ➤【COLORFUL NIGHT LIGHTS & AUTO SHUT OFF】Our electric dehumidifier has...
  • ➤【TWO WORKING MODES & ULTRA QUIET】The dehumidifier designed with high...

Though this dehumidifier is small – it’s only 3 pounds. It is the best for small spaces like a 4×4 grow tent. It can dehumidify more than 35oz (4 cups) 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 between 40% to 80%.

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

If you don’t own a grow tent, as long as your space is no bigger than 250 square feet, you’re good.

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

If you place the dehumidifier in an area larger than a 4×4 tent, you most likely won’t see any improvement in your grow area humidity levels.

PROS

Very compact and lightweight
Draws out moisture very well
Can set desired relative humidity level from 40% to 80%

CONS

Not suitable for areas larger than a 4×4 grow tent

Why Run A Grow Room Dehumidifier?   

So why can we grow plants indoors without having to get a dehumidifier?

I’ve covered its basic use and purpose, which is to control humidity in your grow area and avoid too much moisture in your space.

If you’re wondering how it does that, well, it’s simple. It basically pulls moisture from the air. The moisture it gets doesn’t just disappear, of course.

Moisture gets stored in a pan or a container it comes with. So most likely, the bigger your humidifier is, the more storage for water it has.

Some humidifiers do not need containers. Think of inverters when it comes to air conditioning. A dehumidifier of that type only has a tubing or two that could lead to a collection vessel or drainage.

Some indoor growers even reuse the water they collected, which is smart because that could save more water.

Having enough humidity level in your grow area is required since this will keep your plants healthy.

If you try growing plants without trying to control your grow room’s humidity, you’ll most likely have plants with powdery mildew, a fungal disease.

Another thing that could happen is bud rot. It’s a type of mold that spreads and is only noticeable once it does. It usually hides and starts inside a bud.

The bottom line is, if you don’t run a dehumidifier and do not control your grow room’s temperature, you’ll get too much moisture. It would make your air stale and destroy your plants.

As the saying goes, prevention is better than cure. Once molds start to pest your indoor garden, it’s the same as starting all over again.

Evaluating Your Grow Room’s Dehumidification Needs

Knowing the size of your grow room is significant information for you to determine how many dehumidifiers you will need and where each of them should be placed.

When it comes to knowing what you grow room needs, always consider how many plants you plan to grow.

That’ll let you know how much water you’ll need in a day, and once you know more about that, you can quickly estimate the moisture and humidity level your room should have.

Besides considering how much moisture is needed by your grow tent or grow room, another thing to consider is temperature management and whether you’ll use CO2.

For temperature management, it’s always good to keep the room at around 70-80°F. This range is good enough for growing most plants, including vegetables and fruit-bearing ones. Flowers would survive better in the higher range.

CO2 enrichment can get a bit tricky, but this should also coincide with your dehumidifier. Having a high humidity level in your grow room will not work well with CO2 equipment.

Lastly, humidity relies on where your grow area will be. If it’s somewhere isolated and cool, and you don’t plan to visit it a lot, additional allowance is no longer necessary.

For a grow room that’ll always have human heat, add at least 5 more points and another 5 if the room has multiple ins and outs.

How To Choose The Right Size Dehumidifier For Grow Tent & Grow Room

How To Choose The Right Size Dehumidifie For Grow Tent & Grow Room

Don’t worry about calculating how big and how many dehumidifiers you should have, as this is simple math.

Here’s an example of what you’ve to keep in mind for you to know how your dehumidifier should perform:

If a plant should receive a gallon of water a day, then a small grow room of 20 plants requires 20 gallons of water a day. This is a total of 120 pints of water input in a day since a gallon is equal to 8 pints.

When spread in a day’s span, your grow room will need 5 pints of water an hour. A pint is equal to a pound of moisture, so a room with 20 plants needs 5 pounds of moisture an hour.

Dehumidifier sizes are usually ranging from 30 up to 300 pints. The bigger the size is, of course, the more expensive it’ll be.

Things To Consider When Buying A Good Grow Tent Dehumidifier

Since humidity and temperatures coincide, it’s best to get a dehumidifier that can efficiently function no matter what the temperature is.

Keep in mind that the cooler the climate is inside, the more likely your dehumidifier won’t be used to its full functionality.

The size of your dehumidifier does depend on the number of plants and the size of your grow room, but if you want to get a big-sized dehumidifier, that’s also fine. It just means that you wouldn’t have to dispose of water more often.

Industrial and residential dehumidifiers are both available for you. Still, if you have a small space, like, let’s say, a 4×4 grow tent, then you should be good with a residential dehumidifier.

FAQs

FAQs

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 in the right areas in your grow tent or grow room 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, you shouldn’t have any airflow issues.

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

What is the best setting for my dehumidifier?

The relative humidity levels in your area could go as high as 80%. That’s not ideal even in a residential place. The best setting would always be 30%-60%

What should my humidity be during flowering?

Since the ideal setting is around 30%-60% level of humidity, keep the setting in the middle of that range during the flowering stage. Specifically, a setting of 40%-50% level of humidity is best during the flowering stage.

Are dehumidifiers expensive to run?

A standard dehumidifier unit with a capacity of 30 pints mostly operates at 280 Watts/hour.  If you’re going to run a dehumidifier the whole day, it should only cost you about 50 cents a day.

So in a month, you only get to spend around $15-$16 for it. Just take note that if your place gets colder, the dehumidifier will most likely consume more power to extract moisture.

The Bottom Line

You can get any dehumidifier you want, but what really matters is that it’ll work with your set-up. This is essential, so be sure to know what you’re looking for when shopping for one. Let’s do a quick recap of everything you need to know:

  • Consider the area where you’ll place your grow tent, room, or box. This means you’ve to check for temperature and humidity.
  • The number of plants you’ll grow is essential for knowing the performance of the dehumidifier you need.
  • The location of your dehumidifier plays a crucial role in how efficiently it’ll function.

EDITOR’S #1 CHOICE

Sale
Eva-Dry Wireless Mini Dehumidifier, White (E-333)
  • EASY TO USE: This mini dehumidifier is spill and mess free. Just hang and...
  • MINI DEHUMIDIFIER GOES A LONG WAY: Super dry dehumidifier unit lasts 20-30...
  • SMALL, SLEEK DESIGN: This portable small design lets you hang or...

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