Best Humidifier For Grow Tent [2022 Update]

Looking for the Best Humidifier For Grow Tent? Here are all the best options on the market, pros, cons and how to use them properly!

There was once a time that we admired people’s luscious indoor plants and greenery from afar, questioning how they could achieve such beautiful and thriving tropical plants inside their homes when the local climate or indoor conditions didn’t match up to what the plants need.

If like us, you’ve experienced disappointing results when trying to grow tropical seedlings indoors, or instead just admired (or envied) people’s indoor plant collections from a distance then you’re in the right place as we have a solution to make your tropical indoor garden dreams come true.

Humidifiers are godsends of us all plant lovers who want to be able to help their plants thrive even when we don’t have the natural resources or climate to do so. They’ll help create a moist and humid atmosphere inside your grow tent and can also be adjusted to suit your plant’s needs as they grow.

We’ll be guiding you through the best humidifiers for your grow tent in this article and have also provided a helpful buyers guide to support you in your search for a humidifier. 

Related Articles:


Some of the links on here are affiliate links and I may earn if you click on them, AT NO EXTRA cost to you. Hope you find the information here useful! Thanks.

Our Best Humidifier For Grow Tent Product Reviews

Best OverallEverlasting Comfort Cool Mist Humidifier for Bedroom (6L)

Our top pick for the best humidifier for grow tents is this huge unit from Everlasting Comfort Store that is marketed as a bedroom unit but is outstanding for large grow tents indoors and outdoors as it can last up to over 2 days without needing refilling. It can work in rooms of up to 500 sq feet. 

This is a filterless unit so you won’t have to worry about regularly cleaning the filter out or have to spend money every few weeks/months on replacing the filter.

This Everlasting Comfort humidifier has been ETL certified for safety and reliability so you’ll have peace of mind about leaving it running all day every day to help your plants thrive. 

The humidifier is whisper-quiet even when on the highest setting so it won’t disturb you when you’ve got it running in your home. 

The water tank is removable from the base which allows you to easily transport it to the sink for refills.

If you were searching for a versatile humidifier that you can use personally in your home, then you’ll be happy to know that this unit comes with a tray that you can place essential oils in to help your room to smell good and also get some great health benefits. 


  • Whisper quiet – Non-disruptive in the home
  • 1.6-gallon water capacity – Will only need to refill every 2 days
  • Filterless – No extra replacement costs


  • Can be difficult to use the first few times – Refilling is complicated

Largest CapacityAIRCARE MA Whole-House Console-Style Evaporative Humidifier

This evaporative humidifier from AirCare is designed for the whole house with its 3.6-gallon capacity and 3600 square feet coverage which will be perfect for large grow tents. The unit also comes on wheels so if you only need to use the humidifier now and again you’ll be able to easily transport it to and from storage.

It offers 36 hours of running time so you may be able to limit refills to every 2 days depending on what setting you have it running on. The water bottle filling is easily portable and there is also a refill indicator when the water level is running low. 

It comes with a digital humidistat which will automatically maintain the desired humidity level with accuracy even when the grow tent conditions change throughout the day. The unit will automatically shut off when the desired humidity level is reached and when the unit is empty to help you save on your energy bills and also prevent the unit from getting damaged.

As this is an evaporative unit, it is quite noisy even when on the lowest setting so it’ll have to be placed away from living areas. 


  • Digital humidistat – Automatically maintains the desired humidity 
  • Wheeled design – Easy portability around your home
  • Huge water capacity – Minimizes refills


  • Noisy – Noticeable sound even on the lowest setting

Best Budget – LEVOIT 6L Plants Ultrasonic Humidifiers

Our best pick for those on a budget is this 1.59-gallon Levoit ultrasonic humidifier that comes with some cool techy perks. This unit is voice control and smart control compatible so you can ask your Amazon Alexa or Google Assistant to change the settings hands-free or use the dedicated app to adjust via the remote control. 

This cool-mist humidifier’s built-in sensor automatically adjusts the mist output based on the target humidity level inputted in auto mode to help maintain optimum conditions for your plants.

The top-fill design makes cleaning and refilling effortless and efficient and will prevent any leaks from occurring on your surfaces.

It has a run time of up to 60 hours depending on what setting you’re using and can humidify spaces of over 500 square feet. 

It is BPA-free and has received FCC certification to keep your home safe and your plants healthy. 

The unit is whisper quiet (30db) so it won’t cause any disruption if it’s placed in a grow tent in your living space. 


  • Smart and voice control compatible – Makes using it more convenient
  • Top-fill design – Easy and efficient to clean
  • 60 hours run time – Minimizes required refills


  • The app is temperamental – Not always reliable to use via smart control 

Best For Large Spaces – AIRCARE Digital Whole-House Pedestal-Style Evaporative Humidifier

This AirCare evaporative humidifier can increase the humidity in spaces of up to 2,400 square feet and when running at level 3 or 4 out of the 9 fan speeds you can expect to refill it twice a day. As this is built for entire homes, it may be best placed in huge grow tents in the yard or even the basement where entire rooms are filled with plants. 

You should be warned, when this unit is running on high it is noisy and will be disruptive in your home if bedrooms are near it. 

The AirCare humidifier automatically shuts off when the desired humidity level has been achieved or when the unit is empty for good energy efficiency and to minimize defects occurring.

The sleek design may make it easier to blend into your home without standing out too much and many owners comment upon how it fits with the aesthetic in their home, especially because the removable tile is customizable to fit with your decorations. 


  • Automatic shut off – Good energy efficiency 
  • 9 fan speeds – Adjust the humidity to what level you need
  • Attractive design – Can blend in with your home


  • Loud – Will cause disruption when running on high

Pure Guardian H4810AR Ultrasonic Warm and Cool Mist Humidifier 

This ultrasonic warm and cool mist humidifier from Pure Guardian offers ultra-quiet operation and good versatility. It can offer up to 120 hours of running time, maximizing the time between refills to make maintenance of your plants more convenient. 

It’s ideal for rooms or spaces of up to 600 square feet so will be good for small to medium-sized grow tents to work efficiently. It has a dual mist rotating nozzle to cover more area in your grow tent without you having to adjust its position from time to time.

As we said, this unit is versatile and comes with an aromatherapy tray so you can use it to create a relaxing environment when not being used for your plants and it also produces a warm and cool mist to suit your needs.

It has a low water indicator so you won’t have to manually check the water levels each time and its compact design will fit easily into busy grow tents.

The design is filter-free and there are no evaporating pads or wicks for you to clean or replace making maintenance much more convenient. 


  • Filter free – No need to spend money on replacements
  • Rotating nozzle – Covers more space without repositioning yourself
  • Low water indicator – Alerts you of when it needs refilling


  • Fills from the bottom – More difficult when refilling

Buyer’s Guide 

Type Of Humidifier

There isn’t just one type of humidifier you can buy for your plants, but 3, so take a read of some of the types below and choose which one will be best for your circumstances.

Ultrasonic Humidifier

Ultrasonic humidifiers release water into the air by a vibrating nebulizer and are often the quietest types of humidifiers because they don’t use a fan to dispense the water. However, convenience means extra cost and you’ll often find these types of humidifiers are the most costly. 

Evaporative Humidifier

These humidifiers use a fan to blow the air over a moisture-retentive wick which then helps to blow the moisture into the air. These humidifiers are self-regulating which means they’ll automatically adjust by measuring and responding to the humidity levels in the grow tent they’re placed in.

They’re highly effective and will also prevent dust from being created and settling around the humidifier and on your plants.

Due to the fan that is used to operate, they can be very noisy especially if you have the fan on the highest level and they also become noisier with age.

Impeller Humidifier

An impeller humidifier works by a rotating disc that transfers water onto a diffuser which then creates water vapour that distributes into the air. They can be quite noisy as they are mechanically operated and can sometimes require a lot of maintenance to keep them in good working order. Impeller humidifiers are one of the most budget-friendly options though.

Size Of Room/Tent

The major factor that you’ll need to look into when choosing a humidifier for your grow tent is the size of the space that you are trying to increase the humidity of.

If you only have a small grow tent then a humidifier that covers around 100 sq feet should be more than enough, however, if you have a lot of plants in a large grow tent then you may want to consider getting a whole-house humidifier. 

Most humidifiers will state what coverage they offer so you’ll be able to match it to the size of your room.

Water Capacity

The larger your water capacity (water tank) in your humidifier, the longer it will be able to run before it needs refilling again. Units that have a 1-gallon capacity will need refilling every12 to 16 hours depending on what setting you have it on, whereas a 2-3 gallon water tank will only need refilling once a day if that.

If you want to minimize filling up your water tank then consider getting a 6-gallon humidifier (these are often whole house units) as this may allow you to only fill up every 2-3 days depending on if you have the unit on high or low. 

Humidity Settings

Many humidifiers will come with various humidity settings on them that you can use to adjust how much water vapour is produced and released into the air.

This will allow you to accurately tailor the humidity levels in your grow tent and keep the conditions at optimum for your plants. Basic and budget-friendly humidifiers may come with less adjustability.

Noise Level

You’ll need to look into the noise level of the humidifier you’re choosing and see if it is suitable for the environment you are going to use it in.

If your humidifier is going to be placed in a grow tent that is placed outside or even in a closed-off area of your home, then finding a quiet one won’t be too much of an issue unless you don’t want to bother your neighbors as well. 

However, if you live in a small house, apartment or have your grow tent in your living room or bedroom where you don’t want it to disturb you then try to find one that is quiet. 

Ultrasonic humidifiers are often the quietest type of unit whereas impeller and evaporative humidifiers can be noisy, but this can often vary depending on the brand. 


As humidifiers produce moisture, this can create a favourable environment for mould to grow so you’ll need to stay on top of cleaning your humidifier regularly.

Look for a unit that can be easily taken apart and cleaned without taking up too much of your time as you’ll have to carry out frequent cleaning to keep everything safe. Avoid buying a humidifier that requires complete dismantling every time you use it (unless you’ve got time to spare). 


Regardless of what type or size of humidifier you choose, you’ll want it to be easily portable for you to carry to and from your grow tent. Ensure that larger humidifiers come with wheels so you can roll them into position when you need them.

You’ll also need to make sure the water container in the humidifier is portable as you’ll have to regularly refill it to keep the humidifier operating. 

Filter Replacement 

Some humidifiers will use filters to keep the air clear of impurities, some of which will need replacing every few weeks whilst others can last for months until they need replacing.

You may be able to extend the life of your filter by regularly washing it to avoid replacement costs, however, you will need to consider the cost of replacement filters when looking into a humidifier as this can easily increase your overall expenditure. 

Frequently Asked Questions

When Should I Use A Humidifier For My Grow Tent?

You’ll still need a good flow of fresh air going into your grow tent regardless of if you’re using one indoors or outdoors, however, using fresh air can alter the climate inside your tent.

If you live in a hot and dry climate then you’ll want to ensure you’re using your humidifier regularly and if your climate is mostly cold throughout the year then you’ll also want to use the humidifier to ensure the conditions are perfect for the size of the tent for your plants.

What Happens If The Humidity Is Too Low In My Grow Tent?

If the humidity levels in your grow tent are too low then your plants will struggle to grow and they’ll also suffer from nutrient loss and you’ll notice their leaves starting to deteriorate.

Your plants will grow, start to droop and they’ll eventually die if you don’t change the conditions inside the grow tent.

During the seedling stage, the humidity levels need to be around 70% whereas when they’re flowering it can be lowered to anything around 30% depending on the plant, so you’ll need to research what your plants need. 

Where Should My Humidifier Be Placed In My Grow Tent?

Try to place your humidifier centrally within your grow tent so that all your plants are covered and will receive the benefits of the humidity and possible air misting. 

How Long Can I Leave My Humidifier Running In My Grow Tent?

It’s considered relatively safe to leave your humidifier running all day long in your grow tent if need be, however, you should avoid or at least take special care when you’re leaving the house as you never know what could happen.

If your plants need constant humidity throughout the day then you’ll need to find a humidifier that has a large water capacity and also has a long-running time. 

Similar Posts