The Best Grow Room Dehumidifiers Of 2021

If you’re struggling with excess moisture when growing indoors, you need the best grow room dehumidifier for the task. These days, there truly is a unit for every grower out there.

Whether you’re a hobbyist growing in a tent or a commercial grower with hundreds of plants packed into your facility, you need a dehumidification system that can stand the test of time and protect your crop.

But with so many different brands and styles online, which one is best for you?

Today, we’re going to help you choose the right one for you and your grow. We’ll cover why you need one of these in your room regardless of scale, and how we selected the top picks this year. 

Then, we’ll outline which dehumidifier is best for which type of grower, so you can easily select the right one! Let’s dive in. 

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The Best Grow Room Dehumidifiers Of 2021


If you’re struggling with excess moisture when growing indoors, you need the best grow room dehumidifier for the task. These days, there truly is a unit for every grower out there.

Whether you’re a hobbyist growing in a tent or a commercial grower with hundreds of plants packed into your facility, you need a dehumidification system that can stand the test of time and protect your crop.

But with so many different brands and styles online, which one is best for you?

Today, we’re going to help you choose the right one for you and your grow. We’ll cover why you need one of these in your room regardless of scale, and how we selected the top picks this year. 

Then, we’ll outline which dehumidifier is best for which type of grower, so you can easily select the right one! Let’s dive in. 

Do All Grow Rooms Need A Dehumidifier?

Grow rooms that are struggling with excess moisture need a dehumidifier to prevent problems such as powdery mildew, bud rot, and other fungal conditions that can affect your harvest.

If you have a small grow room with just a couple plants, you likely won’t need a dehumidifier. 

You should be able to adequately control humidity with an exhaust system to expel hot, moist air. 

However, larger grow rooms with lots of plants are going to inevitably be incredibly moist. Think about it this way - the moisture you put into your plants (with each watering/feeding) will be released back into the environment. 

If you don’t remove this excess moisture from the grow room atmosphere, you’ll end up with a super humid environment capable of causing problems.

Most commercial growers cannot afford to forego a dehumidifier in their facility. With your crop on the line, this investment will ensure your plants make it to harvest and you won’t experience crop failure related to excess humidity.

What Makes The Best Grow Room Dehumidifier?

What Makes The Best Grow Room Dehumidifier?

We feel that it’s important for us to cover the criteria we used when selecting these systems, so you know what to look for when you’re shopping for yours.

Brand Reputation

First and foremost, we considered brand reputation. The products you’ll find on our site are sourced from the top brands the horticulture industry has to offer, with outstanding reputations of producing reliable, quality dehumidifiers.

The best dehu brands in the industry and a sneak peek at who you’ll see on our list, our Quest & Ideal-Air.

Most of the units you’ll find from these brands come with a warranty to help eliminate any stress you have about your investment, as you can rest assured you’re acquiring a unit that the brand stands behind.

Should anything go wrong, they will help make it right and get your environment back to where it needs to be.

Moisture Removing Capabilities (Pints Per Day)

We also looked at a unit's ability to remove moisture from the growing environment - as after all, that’s the sole purpose of a dehumidifier!

Dehu’s are sized by how many pints they can remove in a day - this metric is known as pints per day (PPD), and is one of the biggest determinants in which dehumidifier is right for you. 

You can learn more about sizing your dehumidifier in our complete guide. There, you’ll learn how to size a unit for soil grows vs hydroponic grows, a typical grow room vs a harvest drying room, and much, much more! It is a must read for anyone looking to buy a dehumidifier online.

Dehumidifier Efficiency

All dehumidifiers are capable of removing moisture - that’s just what they do. What really separates the best grow room dehumidifiers from the rest is how efficiently they are able to do this.

This is rated in pints removed per kilowatt hour (Pints/KWH). While smaller units are sure to be really efficient, this is tougher to accomplish as you increase the size of a dehumidifier.

Yet, some of the products you’ll read about below are capable of removing 800+ pints per day, while maintaining high efficiency of around 6.6 Pints/KWH!

Can The Dehumidifier Cool Your Grow Room, Too?

The other main environmental concern you’ll have is maintaining temperature in the grow room. With all the equipment you bring into the grow room such as lights, CO2 devices, and of course - dehumidifiers, you’ll be raising the BTU’s of the room.

What Are The Best Grow Room Dehumidifiers?

BTU’s are a measurement of how much heat energy is released into the atmosphere. The higher your BTU’s, the harder you’ll have to work to remove excess heat and bring temperatures down.

In many cases, this will require a grow room air conditioner. Another investment may sound out of the question for certain grows, which is why you should invest in a dehumidifier capable of cooling the grow room environment as well!

That’s right, select units will actually take the humid air, dehumidify and cool it, and then release it back into the atmosphere, bringing the temperature down and really helping you dial in your grow room environment.

Now, there were of course other things that went into our decision making process for the best dehumidifiers for indoor growing. We listened to what some of the best growers in the industry have said, and took their input as well. Let’s get into our top picks this year!

What Are The Best Grow Room Dehumidifiers?

We know that ‘the best grow room dehumidifier’ is not a one size fits all answer. Different types of growers will be better suited with different units, which is why you really need to understand your particular grow room.

We already mentioned you should read our guide on sizing your dehumidifier, as this will help you select the right one. We’ll start by covering the best systems for smaller grows, and work our way up to huge commercial units.

Best For Small Grow Tents or Rooms - Ideal-Air Dehumidifier

We aren’t going to start our list off with the biggest, most powerful units we have, because we know just how many smaller growers are struggling with excess humidity.

Best For Small Grow Tents or Rooms - Ideal-Air Dehumidifier

That’s why we want to highlight the Ideal Air Portable Dehumidifiers. These are small, mobile units that you can easily fit in the corner of your small closet grow, a grow tent, or really any small space needing dehumidification! With a few different sizes, you can choose between:

  • 22-30 PPD
  • 30-50 PPD
  • 50-80 PPD
  • 60-120 PPD

These small dehumidifiers are rated at AHAM standards, and start at just over $230, a reasonable investment for hobbyists looking to cultivate top shelf in their own home.

But, they aren’t just cheap units. They come equipped with a bunch of features to improve your grow and automate your work, including:

  • Auto restart in power failure
  • Digital LED screen to control the unit
  • You can plumb the system and completely automate the condensate draining process
  • Low temperature defrosting
  • Quick filter changeouts to keep the unit running as intended
  • Heavy duty compressor will stand the test of time
  • 1 year warranty on electrical components, 5 year warranty on compressor
  • Automatic shut-off when reservoir is full of condensate, to protect the unit from excess moisture itself

Grow tents are somewhat notorious for producing humid environments, and Ideal Air Portable Dehumidifiers are the solution. Learn more by heading over to the product page and seeing if these are right for you!

Best For Medium/Large Growers - Ideal-Air Pro Series Dehumidifier

Best Overall Unit - Quest Overhead Dehumidifiers

If you’re a medium to large hobby grower, or even a boutique grower and the previously mentioned units are too small for you, but you can’t justify investing in the Quest Overhead units (which we’ll cover in a minute), the Ideal-Air Pro Series Dehumidifiers are probably for you!

These are the most affordable professional style horticulture units, available in three different sizes: 60, 100, and 180 pints per day.

It features automatic restart in case of a power outage, and easy to use digital humidity readings.

Other cool features that you may not expect in this price range include built-in defrost, durable powdery coated construction with a heavy-duty compressor, removable & washable filter, and more.

Best Overall Unit - Quest Overhead Dehumidifiers

There is no doubt that Quest is the industry leader in horticultural dehumidification.

They will make more than one appearance on this list (spoiler alert!), but we wanted to start with the most popular, best selling dehumidifiers currently on the market - The Quest Overhead Dehumidifiers.

Best Overall Unit - Quest Overhead Dehumidifiers

These premium systems can be implemented by serious hobby growers with the budget for the best, but they are more commonplace in larger boutique grows and commercial facilities.

This family consists of eleven different sizes, ranging from 70 PPD all the way up to mind blowing 876 PPD!

But, the reason we consider these to be the best dehumidifiers for indoor growing is the efficiency across the entire line. Using patent-pending coil technology, these units operate as low as 4.8 Pints/KWH - this efficiency is unrivaled across the horticulture industry! 

We want to highlight a few specific features you may be interested. Keep in mind that not each and every Quest Overhead Dehumidifier has the same features, so be sure to consult the individual product before purchasing.

  • Cooling Capabilities - certain units implement an efficient split system that will help lower BTU’s in the grow room, managing heat and humidity simultaneously.
  • Versatile, Plug & Play Installation - with option mounting brackets available for purchase, you can hang these units on the ceiling to get the most out of your valuable floor space, or install them on the floor. 
  • Option Condensate Pumps - By adding the optional condensate pump & ducting kits before checking out, you can further free up space and provide the ultimate flexibility for any type of grow room!
  • Standard MERV-11 Filtration In Each Unit - These filters will help capture unwanted particles, such as mold spores, and prevent them from being circulated back into your growing environment.
  • Standard 5-Year Warranty - While these units are as good as it gets, and you can rest assured they’ll get the job done for years to come, the 5 year warranty will protect your investment.
the best dehumidifier for most commercial growers is the Quest OVerhead series.

To learn about each and every Quest Overhead Dehumidifier, click the ‘shop now’ button below and check out the description where we highlight each individual unit!

Best For Commercial Grows - Quest IQ Series HVAC Dehumidifier Systems

Best For Commercial Grows - Quest IQ Series HVAC Dehumidifier Systems

The biggest grow facilities need all kinds of equipment and systems in their operation. Make a sensible investment in an intelligent environmental control system - the Quest IQ Series HVAC Dehumidifier Systems.

This innovative approach to HVAC/Dehumidification is the most advanced solution on the planet. It offers technology tailored to your grow room, because not all grow rooms are one size fits all! 

When you get your facility setup with a Quest IQ Series System, you’ll enjoy up to 30% energy savings. Just think about how quickly you’ll see a return on your investment! 

And, that isn’t even considering the increase in profits as you are able to produce higher quality crops, while maximizing your commercial grow space through a small footprint.

automate your environment with the Quest IQ Series

With 24/7 real-time internet monitoring of your environment, you can free yourself from your facility and get back to enjoying life. Simply set alerts to be notified of any pertinent infor related to your atmosphere!

The Three Components Of The Quest IQ Series

There are three different series that comprise the Quest IQ Evolution Series:

  • Evolution Series - The evolution series features built in redundancy, scale, and control with installation simplicity and energy savings. This series takes up a small footprint and can either be suspended from a structure or grade mounted. With single point power and electric or HW heat with 100% modulation, you can achieve complete redundancy in a cabinet.
  • Compressor Wall Series - Offering the controllability and flexibility of chilled water with the simplicity and scalability of DX. These are typically best for indoor grow or hybrid greenhouse spaces with 1,200-10,000 square feet. They can either be grade mounted or roof mounted to meet your needs. It offers more sophisticated applications and schedules than the other 2 series.
  • Dry Coolers Series - This series offers huge advantages in flexibility and a reduced installation cost, as you can use multiple units on one fluid cooler. This advanced dry cooler tech uses drastically less refrigerant while removing moisture and heat simultaneously.

To learn more, simply head over the produce page by clicking the button below. We’ll need to gather some information from you to better understand your grow, and come up with the best solution for you.

Best For Harvest Drying & Curing Rooms - Quest CDG 174 Dehumidifier

Best For Harvest Drying & Curing Rooms - Quest CDG 174 Dehumidifier

Technically you can use your existing unit, but if you have a separate drying and curing room you’ll want to use a dehumidifier specifically designed for combatting moisture in these environments.

Your plants are going to expel a ton of moisture into the air the first few days of drying. These rooms are as humid as it gets. To prevent losing your crop to bud rot in this final stage, you need a rugged dehumidifier that can handle this task!

The Quest CDG 174 Dehumidifier is built just for this. With two options - 75 PPD & 176 PPD - you can control the quick transpiration of moisture into your drying and curing chambers. 

With heavy duty wheels and a transportation handle, you can easily move these around the grow room as needed.

Another thing that sets these apart is the MERV-8 Filtration it features. These filters capture mold, pollen, dust, and other unwanted spores that could affect your crop.

This effectively cleans the environment and keeps your plant quality safe! Learn more about drying and curing your harvest in our complete guide. 

Final Thoughts On The Best Grow Room Dehumidifier

Here at Hydrobuilder, we are the one-stop shop for all things growing - indoors and outdoors.

We carry not only portable dehumidifiers and commercial dehumidifiers, but we also carry all the dehumidifier filters and parts you'll need to keep your unit running in tip-top shape.

You should have a good idea of what the best grow room dehumidifier for your specific grow is by now. But if not, our experts are here to help you.

You can reach out to us by emailing or calling us (details below) and we’ll help you pick the perfect unit for your grow room, so you can feel good about investing in your crop.

Don’t risk losing your investment to mold or other moisture related problems - these dehumidifiers will pay for themselves with easy control of humidity. Insure your crop with one today!

Have questions about your grow? We're Here To Help!

Our Northern California based experts can help. We're here to make sure you get what you need to maximize your harvest.

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