Humidity levels inside a grow tent can be a major determinant of healthy plants or wasted harvests. You should be able to effectively keep the humidity at an optimal level. Therefore, you need a high-efficiency humidifier that meets both your requirements and your budget.

We’ve picked some of the top models available to help you choose the best humidifier for your grow tent. Stripping their functionality down to the minimum will allow you to easily choose the one that suits your needs.

Beyond that, the buying guide will focus on the factors you need to consider. let’s start.

Why do plants need humidity?

Like all living things, plants adapt to their natural environment. Most of the wonderful houseplants we see around us come from warm tropical regions. The air in these areas is humid all year round. These plants develop leaves and root systems according to the environment and require optimal humidity for growth. Lower humidity causes more water to evaporate through the leaves. If your plant leaves feel dry and brittle, this is the first sign that your plant needs a moist environment around it.

Additionally, some plants, such as epiphytes, meet their water needs by absorbing moisture from the air through their leaves. Of course, the high moisture content (high humidity) in the air will help such plants thrive.

Optimal humidity is critical for vegetation performed in grow boxes or grow tents. Adequate humidity is most important, too much humidity can lead to mold formation and mildew problems, while too little humidity can lead to stunted growth. Therefore, choosing the right humidifier for your grow box or grow tent is a crucial decision.

ECO Farm Hydroponics 8L Capacity Air Humidifier Grow Room Tent

Features:

This ECO Farm humidifier can kill 99.9% of bacteria in water, thus atomizing sterile water into your home to increase humidity. Users of this humidifier find it durable, easy to clean and quiet to use. When set to “low”, the unit makes very little noise but adds enough humidity. Its powerful humidification is enough to keep your room comfortable all day long. The nozzle and output knobs of our plant humidifiers are very easy to adjust. With the 360° rotating nozzle and output knob, you can easily adjust the humidity to suit your space. The most serious problem reported by humidifier users is growth in the tank. This may be due to neglect to clean and maintain your humidifier, usually once a week. Our cool mist humidifier is very user-friendly, with a large opening that allows you to reach into the tank for cleaning, making cleaning and filling easier.

Pure Enrichment MistAire Ultrasonic Cool Mist Humidifier

Features:

Ultrasonic Cool Mist technology hydrates dry air safely and quickly for up to 25 hours, allowing you to breathe easier and get a more restful night’s sleep. High and low speed settings combined with a 360° spray nozzle help you consistently balance and regulate the humidity in your home year-round to relieve cold symptoms and sinus problems. The 1.5L water tank provides ideal coverage for bedrooms, offices, nurseries and other medium-sized rooms. An optional night light provides a soothing glow, while an auto-off feature turns the humidifier off when the water level is low or the tank is removed.

PureGuardian H965 Ultrasonic Cool Mist Humidifier for Grow Room

Features:

The PureGuardian H965 Ultrasonic Cool Mist Humidifier prevents dry air in your home and is ideal for those with colds, allergies and dry skin. The easy-to-fill 1-gallon tank is perfect for a 320-square-foot room and can run for up to 70 hours. Silver Clean prevents slimy mold and the growth of tank surfaces — a common problem with traditional humidifiers. The aromatherapy tray option helps create a relaxing environment with your favorite essential oils. Oil not included. Create a better home environment and optimize your comfort with an ultra-quiet, soothing cool mist. This benchtop humidifier has a low water level indicator that lets you know when to refill the tank. The night light feature makes it a great addition to a kid’s room.

Factors in Choosing the Best Plant Humidifier

1. Area coverage
This factor is the primary consideration when choosing a humidifier for your plants. The size of the humidifier should be appropriate for the size of the room in which you will place the unit. If you choose a capacity unit that is smaller than the size of your room, the plants will not get the humidity levels they need. Conversely, if you choose a humidifier with a much larger capacity than needed, it will add too much moisture to your home environment.

Always choose a humidifier based on the size of the area where you want to maintain humidity levels. I would recommend increasing capacity units by around 20%.

2. Reservoir size and operating time
Tank capacity and run time are two important factors in determining a humidifier. These two factors are complementary. Although all modern humidifiers are equipped with the option to automatically shut off the unit when the water level is low, we recommend a unit with a longer run time to avoid repeatedly checking and topping up the unit.

As far as a plant humidifier is concerned, you don’t need it to run 24 hours, especially at night, so a unit with a tank capacity for 24 hours or more of run time will suffice. You can top it up with water once a day and it’s ready to go. However, we list units in our reviews that last longer with full tank capacity.

3. Humidity level
Most humidifiers have at least two set points for mist output control. Make sure you get the model to control the output according to the plant needs.

4. Rotating nozzle
Make sure you have a unit that can direct the mist through the 360 degree swivel nozzle where you need more output. Also, if you’re using a humidifier in a confined space, you can blow the mist away from the walls to avoid mold formation.

5. Fog temperature
Fog temperature does not affect plant health, so from a plant health standpoint, it doesn’t really matter which humidifier you choose.

However, if you plan to use your humidifier primarily during the winter months, a warm mist humidifier can help raise the room temperature.

6. Maintainability and ease of use
No matter what humidifier you’re looking to buy, you’ll need to add water and clean it from time to time. Choose a model that’s easy to top up; typically, humidifiers that fill from the top are the easiest. The device shall be easily disassembled for cleaning and the water tank shall be easy to clean thoroughly. Ease of cleaning is essential because you don’t want pathogens and bacteria to grow in your humidifier.

7. Humidity display
An additional feature of modern devices is the display of the current humidity level in the room. A humidity reading on the humidifier can be of great help since you can easily see the current humidity level in the room. It helps you find the right balance when running your equipment.

Conclusion

Have a humidifier to help increase humidity in your grow tent. The most critical thing is to make sure your plants are getting plenty of water. As they consume more water, their ability to tolerate dry air improves.