The 10 Best Humidifier for Grow Room – Cheap, Small, Medium, Large Humidifiers Reviews 2023

In order to grow cannabis indoors successfully, you need to ensure the conditions are just right. This involves controlling your plants’ environment effectively so that they have everything they need to thrive. Getting the right humidity is an important factor when it comes to growing cannabis, as with a too high or too low humidity your plants will falter.
With a humidifier, you can control the humidity in your grow room so that it is at the optimum level for fruitful growing. Here we take a look at some of the best humidifiers for your grow room.

Why do I need a humidifier for growing cannabis?

Cannabis plants require different levels of humidity at different stages of their growth cycle. This is why having an automated humidifier in your life will save you from a lot of stress and potential mistakes. For instance, at the start of their growth they are likely to need a level of between 40%-70% humidity, but when they start to flower the humidity needs to be at a stable 45%
A humidifier ensures that you can adjust the settings so that it delivers the right level of humidity at those all important growth stages. They really are an essential device when it comes to successful growing and a purchase you certainly will not regret making.

Top 10 Humidifiers for Growing Cannabis 2023

#1 (Best for Large Grow Room) hOmeLabs 50 Pint, 2500 Sq Ft Dehumidifier

There are various humidity diseases that can target cannabis – this is because cannabis is extremely sensitive to environments with high humidity. Diseases such as Mildew and Botrytis are just a few of the humidity based diseases that can destroy your precious marijuana crop when growing indoors.
Thankfully, there is a solution and that comes in the form of a dehumidifier. This product from hOmeLabs is a perfect addition to any large grow room, it is easy t use and can be maneuvered easily into a designated space as it is on wheels. It will suck the moisture from the air and can consume up to 50 pints per day if you need it to. Another pro is that, unlike many dehumidifiers, it is super quiet so won’t cause too much annoyance. This is a great choice for keeping indoor grown cannabis plants healthy.
#Dehumidifier #Humidity #Mildew #Botrytis #Humidity_diseases

#2 (Best for Medium Grow Room) hOmeLabs 30 Pint, 1000 Sq Ft Dehumidifier

A dehumidifier is an essential device for any serious indoor cannabis grower. It will help to prevent humidity based diseases such as botrytis, powdery mildew, and bud rot – all of which could be catastrophic for your plants. Such a simple investment can really help to improve your yield, and we’re confident you won’t regret the decision.
This dehumidifier from hOmeLabs would be suitable for a medium sized grow room, it measures 1000 Sq Ft and can easily be moved around thanks to the wheels underneath it. This machine is super effective and can suck about 30 pints of water from the air per day if necessary. You can also set it to be at the perfect moisture level for your cannabis plants. An easy to use, super efficient machine that will serve your plants well.
#Dehumidifier #Powdery_Mildew #Botrytis #Bud_Rot #Humidity_diseases

#3 (Best Mini-Dehumidifier) Eva-Dry New and Improved E-333 Renewable Mini Dehumidifier

If you are growing indoors and are worried the humidity levels in your grow-space are getting too high and creating the necessary environment for powdery mildew or, even worse, bud rot, to develop then it’s important to get yourself a dehumidifier fast. This small but effective humidifier works great in a space of up to 333 cubic feet, will run unassisted for up to 30 days and is completely rechargeable.
The pros of this product are that: rechargeable batteries are built in; it can be hung up without being connected to a power source; it has an indicator window which shows when it needs to be recharged, and; it can absorb up to 10 ounces of moisture per recharge. There is also no risk of spillage with this unit, great for those of a forgetful nature. Other than the limited space it is capable of dehumidifying, there is little wrong of note with this unit.
#Dehumidifier #Bud_Rot #Powdery_Mildew #WPD #Small_Spaces

#4 (Best for Large Capacity) Ivation 70 Pint Energy Star Dehumidifier

If you have a huge growing space but have noticed rising humidity levels or the appearance of white powdery circles on your plants’ leaves or the dreaded appearance of bud rot (when your leaves, buds and/or pistils darken, discolor and dry up), this is the dehumidifier for you. This unit alone is capable of taking a whopping 70 pints out of the air per day so you can be sure this unit won’t leave your buds sitting in damp conditions.
The pros of this product are: its high dehumidifying power; its effective prevention of mold, mildew dust, and bud rot; its easy installation and huge 1.3-gallon tank; and its useful settings and adaptable fan speed. The cons of this product are the price, relatively high energy use, and its heavy weight. However, if you’ve got a big grow space this is likely the dehumidifier for your needs and the cost is not inhibitive.
#Dehumidifier #Bud_Rot #Powdery_Mildew #Powdery_Mildew #Large_Spaces

#5 (Editor’s Choice) Holmes Cool Mist Comfort Humidifier with Digital Control Panel HM1865-NU Review

If minimal effort is something that sounds good to you, then this cool mist humidifier from Holmes will be right up your street. It can run for 48 hours with just one tank of water   (which has a 1.5-gallon capacity). Thanks to the inbuilt Humidistat this humidifier is able to carefully monitor the humidity in your grow room – it will switch off as soon as it reaches the humidity you want and will switch itself on again if that level changes.
Alongside the Humidistat is a speed controller – there are 3 speeds to choose from so you can select the most optimum level to get the exact humidity needed for your plants. This product will also highlight to you when the filter needs replacing – so have no fear that any unpleasant mold will arrive. It almost seems as if this product was made with growing cannabis in mind – it is that perfect for creating the perfect humidity for weed.

#6 (Best for Grow Tent) Crane USA Humidifiers – Ultrasonic Cool Mist Humidifier

If you’re looking for a humidifier suitable for a small space, that runs super-quiet, and does not require the use of expensive filters, then this funny looking humidifier will be just what you need. Suitable for a grow tent of around 500 square feet, you can leave this device to it for 24 hours without having to worry about topping up the one-gallon tank that will keep plants coated in just the misty air they need.
The best thing about this unit is that it also has a ‘clean control’ system. This just means that it makes sure mold and bacteria can’t grow on the anti-microbial material it is made out of so you won’t open your grow tent to find a scene from a gruesome horror film. On the other hand, it does require the use of filtered water, which can be an added annoyance if you don’t have a filtration system to hand.
Fortunately, this unit has an auto-shutdown feature for when the water is low and is very portable weighing just 4.5 pounds. So if you’re after a humidifier for a grow tent, and can be a bit forgetful, this is a great choice.

#7 (Cheap Humidifier) PureGuardian Ultrasonic Cool Mist Humidifier

If your grow room is a bit bigger than most, then getting the right humidity will require a more powerful machine and you might want to choose a unit with a bigger storage capacity so that you can set it to work for a few days at a time. This superb product has a 1-gallon tank that can last for up to 70 hours, unattended so fits the bill nicely for these requirements.
The variable speeds also give you excellent control, while the inbuilt night light is also a handy feature. Made with a surface safe from mold and mildew, you can be sure you are not going to be bringing any unwanted organisms into your grow room with this unit. It is also filter-free, keeping running costs as low as the whisper quiet sound it makes when in use.
At just 3.6 pounds it is not too bulky to move around when you need to, whilst the clever ultrasonic technology used to disperse the mist enables three speeds which can be sent in multiple directions if desired. So if you like some additional control, want some extra time between top-up needs, and have a medium-sized grow room, this is a great value choice for your needs.

#8 (Best for Large Grow Room) Honeywell Cool Moisture Console Humidifier

As is clear from its appearance, this humidifier is state of the art. It is a great choice for a large grow room thanks to its 3-gallon capacity, meaning that it can produce the humidity you need for all of your plants. When running on a low setting this humidifier can run for 24 hours, and after that, all you need to do is simply re-fill the water tray.
This humidifier will make your growing experience as easy as possible thanks to the presence of the adjustable Humidistat. With this helpful tool, you can set the humidity to a set level and then relax – the humidifier will switch off and on to ensure that level is maintained, keeping you and your plants happy.
The indicator lights make it easy for you to know when the correct humidity has been reached and when you need to refill the tank. With this easy to use humidifier in your life, unhealthy cannabis plants will be a thing of the past. So if you want a humidifier that has tons of capacity, is easy to use, and keeps your plants healthy, this should be your humidifier of choice.

#9 (Best for Medium Grow Room) Pure Guardian Ultrasonic Cool Mist Humidifier

For those of you with medium-sized grow tents than this humidifier would be a great choice.  Despite its small size (7.5 x 7.5 x 13.2 inches) it has all the important features you will need to create the perfect humidity for cannabis. Taking one gallon of water, this humidifier can run from between 15 and 70 hours, depending on the setting and the atmosphere within with you live.
Another welcome feature of this humidifier is that it is very quiet – producing almost no sound when operating. So, thankfully, you won’t be faced with an annoying buzzing sound or attract attention to your grow tent. You also don’t need to worry about mold growing on this humidifier which can be a common problem thanks to the presence of Silver Clean Protection.
For a simple, easy to use, compact humidifier for your grow tent look no further than this Ultrasonic Cool Mist Humidifier from Pure Guardian.

#10 (Best for Small Room) Holmes Warm Mist Humidifier HWM6008-NUM

Specifically designed to work best in smaller spaces this humidifier from Holmes is a superb option if your grow room is of the smaller persuasion. With its 1.7-gallon tank, this humidifier can run for up to 24 hours without needing to be refilled – great if you know you are going to be out for most of the day.
There is the option for 2 different speeds, so depending on your needs you can adjust accordingly. You also don’t need to worry about replacing any filters as this product is filter free – so there is no extra cost once you have purchased this humidifier.
Cleanliness is a breeze with this humidifier, in addition to being dishwasher friendly, it also has anti-microbial protection embedded within the structure so it won’t harbor bacteria. This is great news for ensuring it works at its optimum performance, keeping your cannabis plants nice and healthy.


This article has reviewed some of the best humidifiers on the market for your grow room. Whether your room is big or small or your budget is high or low, there is something for everyone on this list that will be perfect for your grow room.
Our top pick of the bunch is the Holmes Cool Mist Comfort Humidifier – with its in-built humidistat and speed controller you can create the perfect humidity level for your plants. We also love how it can keep going for 48 hours without needing any attention. A top product.
We are confident that you won’t regret purchasing a humidifier for your grow room or grow tent as this is an essential means of keeping your precious crop of weed in tip-top shape and ready for your enjoyment.