The Best Grow Room Humidifiers Of 2021

If you struggle to keep moisture up in your growing space, you need the best humidifier for your grow room.

Many growers struggle to keep humidity down, particular those who live in humid climates. But plenty of us grow in super dry regions as well, such as the west coast, southwest region of the US, etc.

In these specific areas, it’s not uncommon for plants to struggle with growth because the environment they’re in does not have ample moisture.

If this sounds like you, read on to learn about the best humidifier for your grow room. We’ll cover an option for each type of growing space, from small grow tent growers to large scale commercial facilities.

Not every grow room needs one of these though, so we'll address this and discuss who should and should not invest in a humidity device.

Let's start by talking about what exactly these units do, and what happens if grow room humidity is too low!

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The Best Grow Room Humidifiers Of 2021


If you struggle to keep moisture up in your growing space, you need the best humidifier for your grow room.

Many growers struggle to keep humidity down, particular those who live in humid climates. But plenty of us grow in super dry regions as well, such as the west coast, southwest region of the US, etc.

In these specific areas, it’s not uncommon for plants to struggle with growth because the environment they’re in does not have ample moisture.

If this sounds like you, read on to learn about the best humidifier for your grow room. We’ll cover an option for each type of growing space, from small grow tent growers to large scale commercial facilities.

Not every grow room needs one of these though, so we'll address this and discuss who should and should not invest in a humidity device.

Let's start by talking about what exactly these units do, and what happens if grow room humidity is too low!

What Is A Grow Room Humidifier Used For?

If you are relatively new to growing, you may not be aware of just how important humidity is - especially when growing indoors, where you can control it. A good place to start is our complete guide on grow room atmosphere.

A grow room humidifier adds moisture into the growing space. These are made specifically for horticulture, built to withstand the rigors of an indoor growing atmosphere.

What Is A Grow Room Humidifier Used For?

They put out moisture droplets into the air, and raise humidity to a more ideal range for plant growth. Here are the recommended humidity levels across different plant growth stages:

  • Seedling/early veg: 70-75%
  • Veg: 50-70%
  • Flower: 40-50%

Increasing humidity in the growing space is important because if it’s too low, plants cannot undergo essential processes, and they will dry up quicker.

To get a little more specific and scientific, your plants will transpire more water than they can uptake through their roots. 

They respond by closing their pores, which protects them from drought, preserving moisture within the cell walls. This sounds great, but the end result is our plants then stop taking in CO2 - limiting plant growth drastically.

CO2 is one of the biggest limiting factors in yield. The more CO2 your plants have (provided grow lighting is not the limiting factor - you need strong grow lights for this to work), the heavier harvests you’ll enjoy. If you want to learn more, check out our complete guide on CO2 for plants.

Does Every Grow Room Need A Humidifier?

Before you start shopping for the best grow room humidifier, be sure you actually need one first.

Otherwise, you won’t just be wasting your money - you’ll be doing more harm than good by introducing excess moisture into the air.

Does Every Grow Room Need A Humidifier?

This increases your risk of powdery mildew, bud rot, and stops the plants from taking water up through the roots, and thus, nutrients.

Start by understanding what your grow room or grow tent humidity is. A hygrometer is a cheap grow room tool any grower should have. Many these days tell you both temperature AND humidity.

Compare your humidity to the ideal ranges we listed above. If your humidity is too low, and you’re in a small grow tent or a closet, you can try raising humidity by filling a saucer with water and running a fan across it. Place it in your grow room near your plants, and see what that does.

If you find that you still can’t keep humidity up, and you’ve got the space for it, a grow room humidifier is exactly what you need. But what size?

What Size Humidifier Do I Need For My Grow Room?

Of course, the size humidifier you need for your grow room depends on how many plants you have, the size of your growing space, and how low your humidity is as it currently stands.

Just like dehumidifiers, humidifiers are rated in pints per day (PPD). This metric indicates how many pints of moisture the unit is capable of putting out into the growing atmosphere on a daily basis.

What Size Humidifier Do I Need For My Grow Room?

We carry units ranging in capacity from as low as 75 PPD all the way up to huge commercial units, capable of up to 600 PPD!

Whether your growing space is less than 100 square feet or 10,000 square feet, we have a humidifier for you. Let’s get into the best humidifiers for grow room use in particular.

What Makes The Best Humidifier For Grow Rooms?

In our criteria for selecting the best humidifier for grow room use in particular, we looked at a few different factors, which you’ll want to consider yourself.

Obviously the most important factor to us was brand reputation and product quality.

Here at Hydrobuilder, we only work with the top vendors in the horticulture industry and provide premium products.

That’s why the products you’ll find on this list are only from these top brands - such as Ideal Air, Active Air, or Current Culture.

We also consider whether it’s a standard unit or ultrasonic unit, as these tend to run quieter and more efficiently, while spreading humidity levels evenly throughout your growing space.

What Is The Best Humidifier For Grow Rooms?

We’re going to break our list of the best humidifier for indoor grow rooms into three categories: best for grow tents or small rooms, best for small-mid size commercial growers, and best for large scale commercial growers.

Let’s start with an option for hobby growers who struggle to get their humidity up.

Best For Small Rooms Or Grow Tents - Ideal-Air Commercial Grade Humidifier

The Ideal-Air Commercial Grade Humidifier is a budget friendly approach to raising humidity in your grow tent or grow space.

It comes in two options - 75 PPD and 200 PPD, so whether you have a small grow tent or a larger grow in your garage, there’s a version for you. These cover 160-320 sq. ft. and 1,176-1,614 sq ft respectively.

Best For Small Rooms Or Grow Tents - Ideal-Air Commercial Grade Humidifier

Ideal-Air is a premium horticulture environment brand so you know you’re getting quality. These units feature multi-directional fogging heads to offer even coverage throughout the entire grow space.

Both units are relatively compact, so you can easily fit these in your space without compromising plant count. Ultra efficient, ultra effective, and budget friendly - what more could you ask for?

Well, maybe a larger unit, more efficient unit. For small to mid size commercial growers, or even serious boutique growers, consider this next choice.

Best For Small & Medium Commercial Growers - Ideal-Air Pro Ultra Sonic Humidifier

If you need a bit more humidity in your growing space, or you’re seeking a more sophisticated unit, consider the Ideal-Air Pro Series Ultra Sonic Humidifier.

Best For Small & Medium Commercial Growers - Ideal-Air Pro Ultra Sonic Humidifier

This advanced, commercial unit is a step up from the aforementioned Ideal-Air unit, with three options available: 150 PPD, 300 PPD, & 600 PPD.

With heavy duty castors, you can easily move this unit around your growing space as needed.

But the real reason we consider this to be one of the best humidifiers for your grow room is the ultrasonic transducers that power the unit.

This supplies ultra-fine moisture particles, creating a more balanced humidity field over your plant canopy.

The plates that comprise this unit are cold-rolled steel, and a stainless-steel box houses electronics. Controls are displayed via an LED screen, and allow you to choose between 30%-90%.

All three options are powered by a standard 115v outlet, so these can also be used in residential settings if needed. Now, let’s move onto the most sophisticated humidifier on the market right now.

Best For Commercial Grow Rooms - Current Culture Aguatronics Humidifier

Best For Commercial Grow Rooms - Current Culture Aguatronics Humidifier

Brand new in 2021, the Current Culture Aguatronics Commercial Humidifier is the best unit for large commercial grow rooms. Particularly, commercial grow spaces that are focused on saving space.

These units have TINY footprints, and can be mounted on the walls. This allows you to get the most out of your expensive commercial grow space, fitting in more plants and thus, achieving heavier harvests and higher profits.

With two options available (288 PPD & 576 PPD), these can cover 5,000-10,000 cubic feet respectively. The first is a single nozzle system, whereas the second is dual nozzle system. However, these are customizable to fit any sized room or facility! Now, let’s talk about some of the features and benefits.

Because 100% of the water used in the humidification process is actually put out into the growing environment, you won’t be wasting any water. And because the droplets are so fine, humidity will rise without the wetness and dewing associated with other units!

best grow room humidifier

Aguatronics is the brain behind this humidifier. It atomizes water and creates a fine, dry fog which effectively raises humidity without putting moisture on your grow lights, foliage, etc. Here are some more reasons this is the best grow room humidifier for large commercial growers:

  • Ultra-Efficient Operation
  • Maintenance Free
  • No Stagnant Water Source (AKA no bacteria colonization)
  • Durable Construction (no moving parts)
  • High-Tech Controllability & Automation (APP based remote access)
  • Plug & Play Module (just add air and water!)
  • Low air and water pressure requirements (optional booster pump add on)

Simply put, there is no other humidity system that offers this much customization, control, and efficiency. Learn more about the Current Culture Aguatronics Humidifier by clicking the button below.

Final Thoughts On The Best Humidifier For Grow Rooms

Now that you have a better idea of what the best humidifier for your grow room is, you can do a bit more research and decide if it’s right for you.

We highly recommend you get a better understanding of the importance of humidity in the grow room by reading our complete guide on VPD.

If you’re struggling with too much humidity rather than not enough, then you should read our review of the top dehumidifiers for the grow room.

Otherwise, all that’s left to do is get to work shopping for your unit by clicking the button below!

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