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9 Best Grow Tent Humidifier – 2021 Buying Guide

Are you in the market for the best grow tent humidifiers? Indoor gardening can be incredibly rewarding, whether you enjoy growing houseplants, are home growing marijuana, or love exotic or tropical plants that won’t survive in your climate.

The biggest challenge to indoor or grow tent gardening is controlling the climate, and for most homes, this means getting the humidity levels just right.

Our buyers guide will help you find the best humidifier for grow room, as well as giving you advice and tips on how to get the best results, features to look for, and more. We hope you enjoy our reviews of the best grow tent humidifiers for 2021!

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Best Grow Tent Humidifier Buying Guide

Best Grow Tent Humidifier for 2021

Our Top Pick Grow Tent Humidifier

Our Top Pick Grow Tent Humidifier for 2021
Pure Guardian H4810AR Ultrasonic Warm and Cool Mist Humidifier

Our top pick as the best grow room humidifier is the Pure Guardian H4810AR Ultrasonic Warm and Cool Mist Humidifier! It has both warm and cool misting functions, a very impressive 120 hour run time, and a large 2 gallon tank, all for hassle-free, reliable operation.

It can easily support spaces of up to 600 and its ultrasonic, which means it’s very quiet while running. Despite the large capacity, it’s a compact and well-designed humidifier that doesn’t take up too much space.

It has 3 settings, a low water indicator light, and it has a silver clean protected tank to prevent mold growth. It’s easy to maintain, refill and use, making it a great option for home or grow tent use.

Best Premium Grow Tent Humidifier

Best Premium Grow Tent Humidifier for 2021
hOmeLabs 4-in-1 Compact Air Purifier

If you want plenty of features and functionality, it’s hard to do better than the hOmeLabs 4-in-1 Compact Air Purifier. It has a state-of-the-art 4-stage filtration system that purifies and ionizes your air while it adds water vapor, ensuring that the air your space gets is perfectly clean of allergens, mold spores, bacteria and dust.

It has a pre-filter as well as a HEPA filter, capturing particles as small as 0.3 microns. The deodorization capabilities make it ideal for home marijuana cultivation and keeping grow rooms smelling clean, and it comes with a 1 year warranty as well as a free 30-day exchange.

Best Value Grow Tent Humidifier

Best Value Grow Tent Humidifier for 2012
Vicks Filter-Free Ultrasonic Cool Mist Humidifier

The Vicks Filter-Free Ultrasonic Cool Mist Humidifier is our chosen value pick, giving you plenty of good features without putting strain on your wallet. It’s filterless and easy to clean, offers 30 hours of misting and is ideal for spaces of 150-200 square feet.

The misting is fully adjustable, and it comes with safety features such as an auto shut-off if it runs dry. The tank is bigger than many other entry level models at 1.2 gallons, and it’s ultrasonic so it runs quietly.

Grow Tent Humidifier Buying Guide

Best humidifier for grow tent

While there are plenty of things you can do to boost the humidity in your grow room, nothing beats the good old humidifier for grow tent. It is affordable, requires minimum effort on your part, and ensures consistently good results.

What Does a Humidifier Do?

Humidifiers add water vapor to the air in the form of a warm or cold mist, increasing the humidity in a space.

Different Types of Humidifiers

Humidifiers add water vapor to the air in the form of a warm or cold mist, increasing the humidity in a space

Ultrasonic Humidifiers 

These release water vapor into the air by using a vibrating nebulizer. Because they don’t use a fan, these are usually the quietest type of humidifier, but they’re also usually the most expensive too.

Evaporative Humidifiers 

These use a fan to blow air over a moisture-retentive wick. These humidifiers work well and are self-regulating (they respond by measuring the current humidity level in a space), but they can be noisy due to the fan, and can get noisier with age. 

Impeller Humidifiers 

These work by using a rotating disc that flings water onto a diffuser to water vapour. Because they are purely mechanical, they can be quite noisy during operation and require a little more maintenance, but they are usually the cheapest options.

Features to Look for in a Humidifier for a Grow Room

Best Grow Tent Humidifier
  • Coverage/Capacity – Different humidifiers are designed for differently sized spaces, and you’ll need a capacity that matches your grow room. If you are using a small grow tent, then you’ll need a humidifier that covers 100 square feet.

    For larger grow tents and rooms, you’ll need a much larger capacity, so look for units that can supply up to 600 square feet.
  • Water tank size – The larger the water tank, the longer the humidifier can run before it needs refilling. Generally, a 1 gallon tank needs refilling every 12-16 hours. If you want to refill only once a day, then you’ll need a 2-3 gallon tank.
  • Humidity settings – This controls how much water vapor the humidifier will release into the air as it works. The more settings you have, the easier it will be to tailor the humidity level of your space. Generally, 3 settings are sufficient.
  • Type – Take a look at evaporative, impeller and ultrasonic humidifiers to see which features are more suitable for you. Ultrasonic humidifiers are the most high-tech and are very quiet, but tend to be more expensive, while impeller and evaporative models are cheaper but can be a little noisy.
  • Cleaning – Humidifiers need regular cleaning to prevent bacterial or mold growth, so it’s important that they are easy to clean and don’t require you to fully dismantle them.

    It’s also important to check if it has a filter and how often the filter needs to be cleaned or replaced.
  • Portability – Your humidifier should be easy to move and store even if it is a large, high-capacity model. The water container should also be easy to move and fill, as you’ll have to do this on a regular basis.

Best Grow Tent Humidifier Reviews

Pure Guardian H4810AR Ultrasonic Warm and Cool Mist Humidifier

This ultrasonic humidifier is exceptionally quiet while running, and the curvy, compact design means it fits in unobtrusively in your room or grow tent. It has a convenient low water indicator and has clean silver protection to help prevent mold growth. 


The 2 gallon tank can run for 120 hours on the lowest setting, which is very convenient, and it is ideal for rooms or grow tents up to 600 square feet.

Pros

  • Ultrasonic humidifier
  • 2 gallon water tank
  • 120 hours run time
  • Cool or warm mist options
  • Quiet operation
  • Stylish, compact design
  • 600 square feet capacity
  • Mold and bacteria repellent
  • Low water indicator

Cons

  • Tanks can be inconvenient to fill from a tap
  • May need distilled water to prevent mineral dust
  • No auto mode

hOmeLabs 4-in-1 Compact Air Purifier

This is a highly compact, high-performance ultrasonic humidifier that has brilliant air purification functionality. This makes it ideal for marijuana grow tents in particular.


It is very energy-efficient and supplies 9 ounces of mist per day, using a unique 4-filter system (including HEPA filter) to remove bacteria and allergens as it cleans the air of odors.


Although it works very well, it is limited to spaces around 40 square feet in size.

Pros

  • Ultrasonic humidifier
  • Ultra-quiet operation
  • 99.97% efficiency rating
  • 4-stage filtering process
  • Eliminates bad smells
  • Compact design
  • Auto shut-off
  • Protects your plants from mold, mildew, and moisture rot

Cons

  • Small area of 40 square feet
  • Humidity percentage cannot be adjusted

Vicks Filter-Free Ultrasonic Cool Mist Humidifier

If you’re looking for a fuss-free humidifier that will get the job done, this is a great option. It’s a low-tech ultrasonic humidifier that’s low on bells and whistles but is affordable and effective.


The 1.2 gallon tank supplies around 30 hours of misting that is fully adjustable, and it runs quietly. It’s filter-free, the tank is easy to clean and fill, and it has an auto shut-off for safety. It’s best for spaces up to 150 square feet in size.

Pros

  • Ultrasonic humidifier
  • Quiet operation
  • Large 1.2 gallon tank
  • 30 hours run-time
  • Auto shut-off safety mechanism
  • Adjustable misting controls
  • Easy to clean
  • Filterless
  • Serve spaces up to 150 square feet

Cons

  • Needs frequent cleaning
  • Output is not as high as more advanced models

VIVOSUN Cool Mist Humidifier

Another good ultrasonic humidifier is this option from VIVOSUN, which is ideal for rooms or grow tents of up to 250 square feet. One great feature is that it is very energy efficient, using 85-90% less energy than steam humidifiers.


With the 365-degree rotating nozzle, you get an even distribution of water vapor, and the 5 humidity settings and remote control allows you to customize your settings conveniently.


It has a well-sized 1.5 gallon tank that allows it to run for an average of 20 hours, and the tank is easily removed for cleaning or refills.

Pros

  • Ultrasonic humidifier
  • Quiet operation
  • Run time of 20 hours
  • 5 humidification settings
  • Remote control
  • Very energy efficient
  • Night sleep mode
  • 360-degree nozzle rotation
  • 250 square foot capacity

Cons

  • 1.5 gallon tank needs refilling every day

Homech Cool Mist Humidifier

This ultrasonic cool mist humidifier has a lot to offer, and the capacity to manage large rooms of up to 430 square feet. It’s very quiet while running, and has a run time of 12-60 hours depending on the setting, which is fully adjustable.


It mists up to 2 feet in height and has a 360-degree nozzle for even coverage, and it’s very easy to clean and refill. This humidifier also comes with inbuilt anti-mold tech to help keep it clean.


It’s also very safe, as it has a low water warning, leak-free design, and waterless auto shut-off.

Pros

  • Ultrasonic humidifier
  • Auto shut off and dry burn protections
  • 360-degree nozzle spray
  • Easy to clean
  • Working duration of 12-60 hours
  • Inbuilt anti-mold protection
  • Dustproof and filter-free design
  • Adjustable misting settings
  • Low water warning
  • Ideal for spaces up to 430 square feet

Cons

  • 1 gallon tank needs frequent refilling

LEVOIT Humidifiers Ultrasonic Cool Mist Humidifier

This is a basic but effective entry-level ultrasonic humidifier. It’s not smart plug compatible, but it does have a 2-3 foot spray height, 360-degree nozzle, and 3 misting settings.


It runs very quietly and has a maximum runtime of 40 hours on a low setting before the 1 gallon tank needs refilling. It has good safety features, including automatic shut-off, and it’s very compact so it doesn’t take up much space.


The unit is BPA-free, ETL listed and CA65 tested, and the display light can be fully switched off. It’s ideal for grow tents and grow rooms up to 376 square feet in size.

Pros

  • Ultrasonic humidifier
  • Quiet operation
  • Auto shut-off, BPA-free, ETL listed and CA65 tested
  • Adjustable misting to 3 settings
  • 2-3 ft misting height
  • 360-degree nozzle
  • Coverage of up to 376 square feet
  • 40 hour run time

Cons

  • Not smart plug compatible
  • 1 gallon tank needs frequent refilling

AirExpect Cool Mist Humidifier

If you have a small grow tent or grow room, this is a good humidifying option. It has a very compact design so it doesn’t take up much surface space, runs quietly, and has a maximum run time of 24 hours on the lowest of the 3 misting settings.


It has an auto shut-off safety feature, and a microporous carbon filter core to avoid dust and stains. The LED lights can change color or be turned off completely, and you don’t need to use soft water.


The even misting means there’s no condensation around the unit, and it’s easy to fill.

Pros

  • Ultrasonic
  • Quiet operation
  • Top-fill design
  • Auto shut-off
  • Timer setting
  • LED light effects
  • 3 misting settings
  • Max run time of 24 hours on low setting
  • Microporous Carbon Filter Core to avoid dust and stains

Cons

  • Small 0.9 gallon tank needs frequent refilling
  • Best for small grow tents

Everlasting Comfort Cool Mist Humidifier

Although it’s a little more expensive, this ultrasonic humidifier has a lot to offer! It is very compact yet has an impressive 1.6 gallon water tank, allowing it to serve rooms up to 500 square feet in size with a run time of up to 50 hours, so refills are kept to a minimum.


It has an auto shut-off feature and filterless design, making it safe to use and very easy to clean. It is very quiet while running and also comes with a 2-year replacement policy for your peace of mind.

Pros

  • Ultrasonic
  • Quiet operation
  • Very compact
  • Large 1.6 gallon tank
  • Good for spaces up to 500 square feet
  • 50 hour run time
  • Auto shut-off
  • Filterless design
  • 2 year replacement policy

Cons

  • Requires soft or distilled water to avoid mineral dust
  • More expensive

Pure Guardian H965AR Ultrasonic Cool Mist Humidifier

Another good basic model is this ultrasonic cool mist humidifier. Although the tank seems a little small at 1 gallon, it offers a maximum run time of 70 hours, so you don’t need to refill as often as you think.


It has 3 misting settings, and the silver clean protected tank helps prevent mold growth. With multidirectional misting and a compact design, it’s ideal for spaces of up to 320 square feet in size.

Pros

  • Ultrasonic
  • Quiet operation
  • Run time of up to 70 hours
  • 3 misting settings
  • Low water indicator
  • Silver anti-mold tank
  • Low water indicator
  • Ideal for rooms up to 320 square feet

Cons

  • Water tank has no carry handle
  • Not quite as powerful as competitors

Best Humidifier for Grow Tents

Our Top Pick Grow Tent Humidifier

Our Top Pick Grow Tent Humidifier for 2021
Pure Guardian H4810AR Ultrasonic Warm and Cool Mist Humidifier

Our top pick as the best grow room humidifier is the Pure Guardian H4810AR Ultrasonic Warm and Cool Mist Humidifier! It has both warm and cool misting functions, a very impressive 120 hour run time, and a large 2 gallon tank, all for hassle-free, reliable operation.

It can easily support spaces of up to 600 and its ultrasonic, which means it’s very quiet while running. Despite the large capacity, it’s a compact and well-designed humidifier that doesn’t take up too much space.

It has 3 settings, a low water indicator light, and it has a silver clean protected tank to prevent mold growth. It’s easy to maintain, refill and use, making it a great option for home or grow tent use.

Best Premium Grow Tent Humidifier

Best Premium Grow Tent Humidifier for 2021
hOmeLabs 4-in-1 Compact Air Purifier

If you want plenty of features and functionality, it’s hard to do better than the hOmeLabs 4-in-1 Compact Air Purifier. It has a state-of-the-art 4-stage filtration system that purifies and ionizes your air while it adds water vapor, ensuring that the air your space gets is perfectly clean of allergens, mold spores, bacteria and dust.

It has a pre-filter as well as a HEPA filter, capturing particles as small as 0.3 microns. The deodorization capabilities make it ideal for home marijuana cultivation and keeping grow rooms smelling clean, and it comes with a 1 year warranty as well as a free 30-day exchange.

Best Value Grow Tent Humidifier

Best Value Grow Tent Humidifier for 2012
Vicks Filter-Free Ultrasonic Cool Mist Humidifier

The Vicks Filter-Free Ultrasonic Cool Mist Humidifier is our chosen value pick, giving you plenty of good features without putting strain on your wallet. It’s filterless and easy to clean, offers 30 hours of misting and is ideal for spaces of 150-200 square feet.

The misting is fully adjustable, and it comes with safety features such as an auto shut-off if it runs dry. The tank is bigger than many other entry level models at 1.2 gallons, and it’s ultrasonic, so it runs quietly.

Get Growing With the Best Grow Tent Humidifier of 2021!

When buying a humidifier for your plants or grow tent setup, remember to consider the size of your space, the noise of the different units, how their humidification technology works, and – importantly – how easy they are to clean and fill. 


The best grow tent humidifier for your space is one that has adjustable misting, that doesn’t need to be filled too often, and that fits into your grow space – and we hope our reviews helped you find it!

About the Author Pat Moreno

Pat is our gardening tool expert here at Sumo Gardener. Working for many years as a private and commercial landscaper, Pat has used almost every type of gardening tool there is. Along with a vast knowledge for types of plants and putting together an amazing looking and maintainable garden, Pat developed a passion for gardening tools as he found that using the right tools vastly improved the ease and outcome of any landscaping job he undertook. When spending hours, days or years using a particular tool, you want to make sure you’ve got the best one for the job, and Pat is the right guy to guide us to the best gardening tools.

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