The need for the best dehumidifier for grow rooms becomes a necessity because most people around genuinely love plants, some due to the lovely smell, and as a result of their beautiful looks, while for the more business-oriented ones among us, it is for profit purposes.

Whichever one it is, if you are looking to growing and cultivating plants in an indoor environment, you would need to invest in a grow tent. Having a grow tent is not nearly enough, meaning you would also need to keep the plants in perfect conditions for them to thrive and develop properly.

One of the most critical conditions that are important for your plants to live and thrive is a sufficient level of humidity. The level of humidity in the grow tent must be at a just enough level, depending on the type of plant.

If the humidity level in the grow tent is too high or too low, It could negatively affect the plant. At high humidity, there is a good chance that molds and mildews develops, and at low humidity, you should get the best humidifier for plant because the plants wouldn’t thrive due to dry air, these could cause some diseases. Having the best grow tent humidifier would help to regulate the humidity level in the room efficiently that benefits the plants.

Read also: Best dehumidifier for drying clothes

Top 5 Dehumidifiers for Grow Rooms

1) Frigidaire FAS504DWD Dehumidifier

Special Features: Digital Humidity control, 115 volt electtric outlet, and energy efficient

Frigidaire 50 Pint Dehumidifier

The Frigidare 50 is a rectangular looking portable humidifier that has a top handle, a side handle, and caster wheels beneath, making it easy to move to different destinations in the grow tent. It has a drain bucket if you don’t want to use the continuous drain mechanism, but removing and emptying the drain is a bit strenuous.

We highly recommend this if you need a dependable humidifier and want something better than the cheap models out there. It has an inbuilt auto-off feature, in which the device shuts down when the drain bucket gets filled, and the device alerts you.

In a home of about 1200sqft and humidity level as far up as 75%, it would take about 3 hours for the device to drop the percent to 50. And for houses larger than 200sqft, we advise you get a larger sized dehumidifier or more than one device in the home. The dehumidifier also reduces your electric bills, although not by a large extent, but in a somewhat manner.


  • high extradition rate; 70 – pint dehumidifier,
  • auto-shutoff,
  • full tank alert system,
  • five years sealed system warranty,
  • can serve large sized rooms.


  • it is expensive,
  • it is large and bulky.

2) Eva-dry E-500 Dry High Capacity Dehumidifier

Special Features: Rechargeable, Renewable, Silica gel technology, 10 years life span

Eva-Dry E-500

The Eva-Dry E-500 device is very small in size and can be quickly moved from one placeto the other without stress. It is designed to draw in moisture from the atmosphere (about 8 to 10 ounce per day), and then retain the moist. The fantastic thing about this humidifier is that you don’t need to connect electricity for it to work, you just hang it in the most comfortable area of a 2×2 grow tent and let it do its job.

This device contains an absorbent that takes in moisture, and after a while, there would need to be recharged by being plugged into electricity, preferably by a small extension cord because of its big size and tendency to fall and break. It makes use of a silica gel that is odorless and non-toxic, after a while of the gel absorbing moisture, it turns pink meaning it time for a recharge. It takes about 12- 14 hours to recharge.

The device is really easy to use, although it is suitable for very small spaces. If the impact is to be felt, we advise you purchase multiple amounts of this product and place it in strategic locations for effectiveness.


  • it is cheap,
  • ten-year life span,
  • whisper quiet operation,
  • no need for electricity.


  • suitable for very small spaces only ( 2 x 2 grow tent)

4) Pro Breeze Electric Mini Dehumidifier

Special Features: small and compact, auto shut off, ultra quiet and efficient

Pro Breeze Dehumidifier

This device is very tiny, and like the eva-dry edy-1100, it also employs a Peltier thermoelectric cooling technology, therefore needing no compressor. It is suitable only for rooms of very small sizes and would perform efficiently in a room size of 150sqft or 1200 cubic feet equivalent.

In a room with humidity of more than 90%, this device removes mold of up to 2 ounces of water equivalent per day, i.e., averaging between ¼ to half full throughout the day. It also has an inbuilt shut-off system that ensures the device turns off when the water tank is filled up while consuming very little power, therefore not causing a considerable spike in your electrical bills.

This dehumidifier is very easy to use and is exceptionally efficient in small spaces. In much larger rooms it wouldn’t make a considerable impact.


  • auto-shut off
  • energy efficient
  • it is cheap
  • quiet operation


  • suitable for very small rooms only

5) Homelabs Small Space Dehumidifier

Special Features: Thermoelectric, portable, and auto shut off function

hOmeLabs Small Space Dehumidifier

This hOmelabs Dehumidifier is a small space dehumidifier as the name implies, it is useful for only small room areas. It is designed with curves that give it the looks of a decorative item in the home, meaning it adds extra beauty. Like the last two humidifiers we reviewed, it also uses a Peltier module that ensures the device is both light weights and runs in a very quiet manner, although you can hear white noise.

For homes in the south, where the atmosphere can be very humid, reaching levels of about 75%, although this device is unable to control rooms of reasonably large sizes, it can bring down the humidity level of smaller rooms by a significantly large amount. It is also very cheap to purchase, meaning that you wouldn’t break the bank for its sake, while its auto-shutoff feature turns the machine off in the event of a full water tank.

This humidifier is very small and cheap, but it works well for the price and size. If you decide to purchase it do not expect fantastic performance.


  • auto-shutoff,
  • cost friendly,
  • quiet operation.


  • suitable for small rooms (about 150sqft)

Where to place dehumidifier in grow room

Depending on the size of the room, firstly you should get an appropriate number or size of humidifiers to satisfy the need of the room and the plants. To deal with a high level of humidity, it is best you place the humidifier close to the source of the humidity issue.

The answer is simply to locate it centrally where it can draw air from all corners and have access to utilities. If there is a grow light, it is best you place the dehumidifier close to it, but it should be far away from the plants at a considerable distance depending on the capacity of dehumidifier you are using.

Grow room dehumidifier calculator – How to use in a grow tent

In order to evaluate the size of dehumidifier required to remove moisture from your grow room efficiently, you need to make a few simple calculations.

Dehumidifier is rated in pints per day. Therefore a 20- pint dehumidifier is rated to remove 20 pints of moisture from the room per day. The dehumidifier capacity is synonymous to the amount of space it would cover. Therefore for you to know the dehumidifier size needed, you need to know the size in square feet of the room you need it for.

How to calculate Dehumidifier size for Grow room

If your grow room contains 40 plants, and you water each at a rate of 1 gallon per day, then you would have about 40 gallons of moisture you would need to remove per day.

Humidifiers are rated in pints. Therefore you would need to convert gallon to a pint, to do this you multiply by 8, and in the case of our example, it gives 320 pints.

This means you would have to purchase a dehumidifier that is capable of removing more than 320 pints per day for the sake of efficiency, maybe about 370-400 pints. You can buy multiple dehumidifiers if there isn’t a single humidifier rating that can serve your grow room needs. If you don’t water the plants every day, then you would find the average according to the rate at which you water the plants.

Also read: Best dehumidifier for conservatory

How to lower humidity in grow tent

Although moisture is an essential criterion for grow rooms, too much of humidity in the grow room is dangerous to the plant, leading to a high percent of mold in the room and making plant prone to diseases. There are ways to reduce humidity in a grow tent.

Firstly, you can use a dehumidifier which is a device that carries out dehumidification, hence lowering the humidity level in the grow room by drawing in moisture from the atmosphere. It is preferable you purchase a humidifier with a large extradition rate, equivalent to the size of your grow room. The device should also have a reasonably large drain tank or a provision for continuous drain because it would be drawing in a large amount of moisture per day.

You can also make use of an air conditioner in the grow room or increasing the number of fans which adds more ventilation in the room. We advise against over watering the plants also, because this could make the soil too damp, therefore increasing the humidity level exponentially.

Plants with large leaves sizes or plenty amount of leaves can increase humidity in your grow room. In order to reduce this, you can reduce or cut down some leaves. Absorbent surfaces like soil that can keep water beneath also help in reducing the level of humidity by minimizing evaporation rates.

Also read: Best humidifier for plants

How to control humidity in grow tent

A very reliable way of controlling the humidity level in your growth tent is by using dehumidifier/ humidifier. Since in a grow room, the major issue with humidity is that the levels are always too high, due to the space being confined and the constant watering of the plants, we would, therefore, recommend you purchasing a dehumidifier.

A dehumidifier is a device that removes moisture by absorbing the air in the atmosphere and in turn releasing hot less moist air. Humidity could also be reduced with the use of proper airflow, ventilation management, and keeping a clean grow space. A carbon filter should also be installed and an inline fan.

Qualities to Consider when Choosing the Best Dehumidifier for Grow Tent

  • Size:

Of course the larger the humidifier, the more the size of the room it can effectively cover. You should also put into consideration the number of plants in your room; if they are in large quantity, then you should purchase an equivalently large sized humidifier with high extradition rate. Apply the calculation procedure explained above.

  • Ability to function at any temperature:

humidity and temperature are relative, making it essential to get a humidifier that would operate irrespective of the temperature, whether very high or low.

Final Verdict: Best dehumidifier for grow rooms

In all, the Frigidaire FAS504DWD Dehumidifier is the best type for your grow room due to its very high extradition rate and its ability to cover large sized grow rooms.

While the Eva-dry E-500 dry high capacity dehumidifier comes out next although it is not as powerful as the Frigidaire, it pulls out a fair amount of moisture, while being relatively inexpensive.

Important reads: