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Last modified on Wednesday, 19 January, 2022

If you own a collection of tropical plants that require high humidity to thrive in your grow tent or grow room, you might wonder what’s the best way to increase the moisture level in the air and maintain it.

The answer is simple – with an air humidifier! These nifty little machines are perfect for maintaining the required relative humidity in your grow room and tents. On top of that, humidifiers for your grow tent aren’t just good for the plants; they’re also good for you!

Unfortunately, picking the best humidifier for grow tent is no easy task. The market is saturated with all kinds of humidifier models – some better suited for grow rooms and others for grow tents.

Thankfully, you’re at the right place. In this article, you’ll learn what are the nine best grow tent humidifiers for grow tents you can buy, what you should keep in mind when buying one. We’ll answer some of the most common questions about these machines.

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Grow Tent Humidifiers Compared

Humifier for Grow TentHumidifier TypeProduct Features
Ultrasonic Warm Mist
  • Extremely large capacity
  • Can work for up to 30 hours on one water tank
  • Comes with an LED display with RH level
  • Long-lasting filter
Ultrasonic Cool Mist
  • Extremely quiet
  • Large area coverage
  • Easy to refill
  • Comes with a rotating nozzle
Ultrasonic Cool Mist
  • Long runtime
  • Very quiet
  • Filter free
  • Excellent for small grow tents
Ultrasonic Cool Mist
  • Consumes very little electricity
  • 16 hour run time
  • Excellent for a grow tent or a small grow room
  • The water tank is easy to refill
  • Easy to clean
Ultrasonic Cool Mist
  • Can keep a relative humidity level between 40 and 60 percent
  • Features a humidity setting of 270 ml/hr
  • Can cover a space of 500 square feet
  • 360-degree rotating nozzles
Ultrasonic Cool Mist
  • Produces warm mist
  • Excellent tank capacity
  • Can work for up to 24 hours without refilling
  • Can be used with essential oils
Ultrasonic Cool Mist
  • 1-gallon water tank
  • Top filling design for easy refill and cleaning
  • Incredibly quiet (28db)
  • Auto shut-off feature with a water tank sensor that runs the device off if the tank is empty.
  • Can be used to disperse essential oil

Humidifier For Grow Tent - 7 Best Humidifiers Of 2022

#1 Homasy 4.5L Cool Mist Humidifier - Best Humidifier For Grow Tent

If the plants in your grow tent or grow room are having problems developing due to a low moisture level, Homasy Cool Mist Humidifier is a perfect choice for you. In fact, this is one of the best ultrasonic cool mist humidifiers you can buy.

The Homasy can hold the humidity level in your grow tent between 40% and 60%, which is essential for a grow tent anyway. You can also use it for a grow room, but it will take a bit longer to reach the listed level of humidity.

When it comes to humidification rate, the Homasy can withstand humidity at a rate of 280 ml/hr. This is leagues above other cool-mist humidifiers in this price range, and you can easily use it to cover not just the grow tent but also a 500 square foot room!

No matter whether you use it for your grow tent or a large grow room, this humidifier can do it all!

We also love the variation the Homasy brings to the table. You can choose between three different mist modes, and on top of that, you can also use it with your favorite essential oils.

When it comes to noise, this humidifier is as silent as it can get, producing only 28db of noise. This is lover than the usual 30db, which means you can keep it next to your bedroom without having to listen to the rattle the whole night.

For safety, there is an automatic shut-off feature that shuts the device down if the tank gets empty. On top of that, this humidifier also features a night mode that lowers the mist output.

Our only gripe with this grow tent humidifier is that it can only push the mist upwards. This is why it’s essential you place it in the middle of your grow tent or grow room.


  • A perfect humidifier for both grow tents and small grow rooms.
  • Can work for more than 24 hours (30 hours)
  • Easy to refill
  • Auto shut down and a safety feature that turns off the device if the water tank is empty


  • It can only shoot mist upwards

#2 Pure Guardian H965AR Ultrasonic Cool Mist Humidifier - Runner Up

You don’t want your plants to suffer because of dry air, but there is no point in getting a humidifier that is meant for large rooms. Pure Guardian H965AR Ultrasonic Cool Mist Humidifier is perfect for keeping up the moisture in a grow tent or smaller grow room.

One feature that sets this humidifier for a grow room or tent apart from the competition is its extremely long running time. It can run for as long as 70 hours on just one tank of water! This is excellent for those that don’t have the time to check their grow tent every day.

The Pure Guardian features a 1-gallon tank that’s coated with silver to prevent any mold or mildew growth. Just keep in mind that even with this protective coating, you will have to clean it regularly. If you use hard water with this humidifier and don’t clean it, it will produce white dust.

When it comes to humidity settings, the Pure Guardian can keep relative humidity between 40% and 50%. While this is not ideal for all types of plants, the moisture levels it can reach are suitable for most plants.

This ultrasonic cool mist humidifier comes with two simple safety features. It comes with an auto shut-off when the tank is empty and a refill indicator. Additionally, this humidifier can also serve as a night light, and it’s compatible with essential oil use.

While the Pure Guarding won’t solve your dry air problem in your grow room since it can only humidify a room that’s up to 350 square feet – it’s perfect for a grow tent. It features a large capacity water tank, it’s filter-free, and can easily maintain the required moisture level.

If you need to use a humidifier in your grow tent, Pure Guarding is one of your best humidifiers for the money.


  • Very affordable
  • Large tank capacity
  • It can double as a night light
  • Long runtime


  • Not the best humidifier for grow room
  • It doesn't come with many extra features

#3 Pure Enrichment MistAire Ultrasonic Germ-Free Cool Mist Humidifier - Best Humidifier For Small Spaces

The third place in our list goes to another ultrasonic cool mist humidifier that’s excellent for a grow tent of a small grow room (up to 250 square feet). If you’re having trouble keeping dry air in your grow tent at bay, this is the best humidifier for the job – let’s see why!

The Pure Enrichment MistAire has a humidifying capacity of just 250 square feet. This is just perfect for small places like a grow tent. On top of that, it consumes very little power – this is why it can cover such a small space.

One of the biggest problems humidifers have is distributing the moisture evenly. That’s not the case with MistAire! This humidifier comes with an easy-to-direct nozzle that lets you set the direction in whichever way you want it. Thanks to this nozzle, you can easily defocus the mist from plants that don’t like getting blasted with moisture directly.

MistAire comes with a pretty low-capacity water tank of just 1.5 liters. This means you will have to refill the tank often if you plan on keeping it on the whole day. With a full water tank, this humidifier can run for up to 16 hours. Thankfully, to refill it, you don’t have to disassemble the whole device.

Unfortunately, MistAire doesn’t come with many additional features. Just like most humidifers on the market, it comes with a safe auto shut-off system. Other than that, you have the night light feature. Pretty basic, but more than enough to supply your plants with all the moisture they need.

Although you don’t get any cool features, you do get a bonus cleaning brush for the disc. This brush ensures this humidifier extremely easy to clean and maintain. Even if you use hard tap water with this humidifier, you won’t have trouble cleaning it.


  • Very quiet
  • Excellent design aesthetic
  • Excellent for smaller places
  • Easy to refill and clean
  • It can be used with essential oils


  • Low tank capacity
  • It doesn't come with many extra features

#4 Everlasting Comfort Germ-Free Cool Mist Humidifier - Best Humidifier For 4x4 Grow Tent

Most people hate noise – especially if it’s a sound humming noise only a humidifier can produce. After a few days, you’d want to break it into pieces.

This is why we’ve picked the Everlasting Comfort Cool Mist Humidifier as the fourth pick in our list of best humidifers for grow room or tent.

This humidifier is as silent as a whisper, producing less than 30 dB of noise. You can rest assured, you won’t have to spend sleepless nights because the humidifier noise kept you up.

Another cool thing about the Everlasting Comfort is its large water tank. With a 1.5-gallon water capacity, this humidifier can run for almost 50 hours without a refill. You won’t find many other models that can work for this long.

Thankfully, a large tank capacity is not the only positive thing about this product. Thanks to the mist output rate of 270 ml/hr, the Everlasting Comfort can keep the relative humidity around your plants between 40% and 60%.

You can also use it as a grow room humidifier, but keep in mind that it can maintain the air humidity level of around 40% in large spaces.

Another plus for this humidifier is its filterless design. Thanks to the silver-coated water tank, you won’t have to hassle with buying new filters every couple of weeks. On top of that, this humidifier is very easy to clean since you don’t have to disassemble it completely.

The only thing we dislike about this product is that it can produce white dust if you pour hard water into it. If you have no other choice, we recommend you clean it more often.


  • Large capacity tank
  • Large area coverage
  • Extremely silent
  • Can run up to 50 hours on one tank


  • Produces white dust if you pour hard water into it.

#5 Honeywell HWM-705B Filter Free Warm Moisture Humidifier - Best Warm Mist Humidifier

So far, we’ve only talked about cool mist humidifiers. However, if you’re having trouble not just maintaining the moisture levels around your plants but also maintaining the required temperature – you will like our fifth pick. Honeywell HWM-705B produces a warm mist only, which is perfect for those that are living in colder areas.

Not only will this humidifier keep your plants warm, but it can also run for hours before you have to refill it. The HWM-705B comes with a 1-gallon tank that’s silver coated, which means you won’t have to hassle as much as with other humidifers when it comes to cleaning.

The HWM-705B can work for up to 24-hours on just one tank of water. This warm mist humidifier is an excellent choice for those that don’t have the time to check up on their plants every day.

The good stuff doesn’t end there. The HWM-705 can maintain a relative humidity level between 40% and 60%. This is ideal for any type of plant growing. Unfortunately, it doesn’t come with an inbuilt moisture meter, so you’ll have to install a hygrometer in your growing tent to ensure the moisture levels are just right.

The HWM-705 has an area coverage of less than 300 square feet, which is perfect for small spaces. Unfortunately, it doesn’t come with directional nozzles, so you’ll have to place it in the middle of the grow tent if you want to spread the moisture evenly.

And if you want to freshen up the air around your plants, you can use the essential oil tray.


  • 1-gallon tank capacity
  • Can work for up to 24-hours without refilling the water tank
  • Can maintain relative humidity between 40% and 60%


  • Not the best humidifier for large spaces
  • It doesn't come with directional nozzles

#6 TaoTronics Cool Mist Humidifier - Best Large Capacity Cool Mist Humidifier

If you have a couple of tents in your room, getting a separate humidifier for each can be incredibly costly. This is why the sixth place in our list goes to a humidifier that can mist up an entire room with no issues. TaoTronics Cool Mist humidifier can work for up to 30-hours on one tank and comes with a couple of other features that are necessary for proper plant growth.

The main feature of this humidifier is, of course, its large-capacity water tank. The tank can hold up to 1 gallon of water, which is enough to keep the TaoTronics humidifier working for up to 30 hours on the lowest misting setting. If you decide to up the misting setting, you cut down the runtime to just 12 hours.

If you’re serious about your plants and want to ensure they have the best possible environment to grow in, TaoTronics is the best humidifier to get. It comes with an LED display and an inbuilt hygrometer. Thanks to the inbuilt hygrometer, you can ensure your plants are getting the right amount of moisture when they really need it.

On top of all this, TaoTronics can also double up as a night light, and it also comes with a shutdown timer. Of course, it also comes with an auto shut-off system when the tank gets empty.

As for the tank, it’s a bit finicky to fill up. On top of that, it also uses filters to ensure no contaminants get inside the mist. Thankfully, the filters are long-lasting, and you can wash them to prolong their lifespan.


  • Large tank capacity
  • 500-square feet area coverage
  • Inbuilt hygrometer and an LED display


  • It's a bit finicky when it comes to refills

#7 Homech Cool Mist Humidifier - Best Humidifier For Grow Rooms And Large Tents

The last place on our list goes to another ultrasonic cool mist humidifier that’s excellent for large spaces. The Homech humidifier comes with a large tank, an adjustable misting nozzle, and a couple of other features most green thumbs will like.

The one feature that sets the Homech Ultrasonic Cool Mist Humidifier from the competition is its ridiculously long runtime. On one tank of water, this device can run for up to 60 hours. This is excellent news for those that don’t have the time to check on their growing operation every day. And thanks to the 360-degree rotating nozzle, you can direct the moisture where it’s needed the most.

When it comes to area coverage, the Homech can mist up the air in rooms that are up to 430 square feet in size. If you have multiple tents set up in one room or just a large grow room, this humidifier is an excellent choice.

Refilling the tank is as easy as pie because the refill hole is big enough for you to fit your hand in it. This also makes cleaning the insides extremely easy. On top of that, Homech utilizes a filter-free design, so you don’t have to bother buying new filters every now and then.

Unfortunately, this humidifier doesn’t come with many extra features. You can set it to work on three different misting options, and it also comes with an auto shut-off safety feature when the tank gets empty. Still, with a runtime this long, you don’t need other features.

Unfortunately, you can’t use essential oils to freshen up the air with this humidifier. But air freshness is not the most important thing when it comes to planting growth.


  • Ridiculously long runtime
  • Easy to clean and maintain
  • Large area coverage
  • Filter-free design


  • It doesn't come with many extra features
  • Not compatible with essential oils

Humidifier For Grow Tent: A Buyer’s Guide

a warm mist humidifier with an auto shut off feature and a led display for a large grow room size

Now that you know what are our top picks for the best humidifier for grow room and tent let’s take a look at what factors you should keep in mind when browsing for one.

Types Of Humidifiers For Grow Tent

save my name email for a grow room humidifier

There are three types of humidifiers: evaporative, ultrasonic, and impeller. Each type comes with its own set of pros and cons.

  • Ultrasonic humidifiers feature a vibrating nebulizer that creates a mist out of fine droplets of water. These humidifiers are usually the quietest since they don’t have a fan. Ultrasonic humidifiers are the quietest and easy to maintain out of all other types.
  • Evaporative humidifiers feature a fan that draws air that passes through a moist wick filter at the bottom and facilitates natural water evaporation via osmosis. An evaporative humidifier is usually very noisy and bulky because of the fan.
  • Impeller humidifiers utilize a rotating disc to break the water into fine droplets and mist it into the air. They produce less noise than evaporative humidifiers but lack the discreetness of ultrasonic cool mist humidifiers.

Humidifier Area Coverage

warm and cool humidifier

  • Area coverage represents how much area your humidifier in a grow tent can cover.
  • Area coverage depends on the humidifying rate and the run time of the machine.
  • Area coverage depends on the type of humidifier, as well as the brand.

For a small area such as a grow tent, you should consider getting a model that can cover 100 square feet. And if you have a grow room, you should consider getting a model that can cover at least 500 square feet.

Water Tank Size

website in this browser best humidifier for grow room

Every humidifier comes with a water tank since it plays an essential role in the machine’s working. Now, the important thing is the tank capacity. The smaller the tank capacity, the more often you will have to fill it up.

For instance, a 1-gallon tank would need to be refilled every 12 to 16 hours. A grow room humidifier usually comes with a bigger tank, usually with a 2-gallon capacity.

Humidity Settings

if you need the humidifier for grow room keep an aye on humidity settings

Humidity settings refer to the amount of humidification the device can do in an hour. This spec is also often referred to as misting settings.

If you need to raise the level of humidity inside your to grow tent or grow room quickly, you should consider getting a model that has a humidity setting of 300 ml/her.

For grow tents, you should consider getting a humidifier with a humidity setting of less than 300 ml/hr.

Safety Features

cold mist humidifier that easy to maintain and can run for 24 hours

To avoid over-humidifying your grow tent, electronic humidifers come with a couple of safety features, such as automatic shut-off or a shutdown timer.

There are also automatic humidifiers that detect the level of humidity in the grow room or tent, and shut down when the desired humidity level is reached.

Humidifers with a shutdown timer are pretty self-explanatory and shut down after a period of time you set.

Some humidifers come with both an auto shut-off feature and a timer, giving you more control over the device.

Noise Level

a humidifier that can run for 24 hours and doesn't produce white dust

Grow room and grow tent humidifiers can be quite noisy. This is why you should consider where you are going to place it. If you place your plant growing operation close to your bedroom, you might want to consider getting an ultrasonic humidifier since it’s the quietest of the bunch.

Filter Replacement

If you need a humidifier for large rooms, make it also comes with an essential oil tray

Some grow room, and tent humidifers come with a filter. The filter should be replaced after some time, although it all depends on the type and brand of the humidifier.

Some require weekly changes, while others require a change of filter after a year or so.

You can try washing the filter to prolong its usefulness, but that’s not a guarantee.

Cleaning And Maintenance

To prevent your grow room or tent humidifier from clogging up and from developing mold particles, you will have to clean it every once in a while. How often you should clean your humidifier depends on the brand and type, but in most cases, you will have to clean it on a weekly basis.

Humidifier For Grow Tent: FAQ

cold mist humidifier that easy to maintain

How can I detach the water tank for refilling?

Most humidifiers have a simple plug-and-play system for the water tank. In many cases, you won’t even have to consult the manual to remove the tank.

Where should I put the humidifier in a grow tent or room?

Since most humidifiers for grow room to grow tent feature a 360-degree nozzle, it’s best you place it in the middle of the tent/room. This way, you’re ensuring the humidity level is even across the whole volume of space.

How Much Water Can A Humidifier Mist In A Day?

It all depends on the model of the humidifier for your grow tent. Most models consume around two 2L of water over a 24-hour period.

Where Can I Buy A Humidifier

You can purchase a humidifier for your grow room or tent online or by visiting the store. Since the COVID19 pandemic is still going strong, it’s best you order it online.

Can A Humidifier Fail Unexpectantly?

Most humidifiers are more durable than you might think. Still, if you’re worried your grow room humidifier will fail, you can always use the auto shut-off feature at night.

How Should I Keep the Humidity up in my Grow Tent?

If your grow tent’s humidity level is too love, it’s important you raise it to the required level for healthy plant growth. Here are some methods you can use to keep the humidity levels up in your grow tent:

  • Grow big and small plants together in the same tent
  • Use a grow room or grow tent humidifier
  • Place wet towels near air holes
  • If you still down own a humidifier, you can use a mist spray bottle. Still, that can raise the humidity levels only so far.
  • Place a couple of trays full of water near passive air holes or intake tubing.
  • Try to keep the temperature of your heater low.
  • Install a low-volume mist atomizer or a fogger into your grow tent

How much humidity should be in a grow tent?

When it comes to perfect humidity level, most crops require a humidity level of around 40% to 60% in your grow tent. Still, this all depends on the type of plant your cultivating. We recommend you use a hygrometer to measure the humidity levels inside your grow room or grow tent.

  • Clones and seedlings require humidity levels between 70% and 75%.
  • Vegetables require between 50% and 70% of moisture in the air.
  • For flowering plants, you need at least 40% of moisture in the air.

Keep in mind that if you let the humidity level fall below 20%, you are risking retarding the growth of your plants. If this happens, you can turn on the humidifier for a couple of minutes or use a spray bottle to slowly spray the water into the grow tent.

If the humidity level goes over 75%, the temperature in the grow room or grow tent will rise. This is


This brings us to the end of our article.

Before we go, a quick recap – if you’re looking for the best grow tent humidifier on the market, look no further than the Homasy 4.5L Cool Mist Humidifier. It has just the right misting rate and area coverage for small spaces like grow tents.

About the author

Hello there, I am Brad “Omni” Smith, the proud founder and chief editor here at So, while they say, „Home is Where the Heart Is“, we believe that home is where every story begins. If you’re passionate about the nest that you call home, join us at Omni Home Ideas.
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