Do I Need a Dehumidifier In My Grow Room? - Happy Hydro

Whether or not you need a dehumidifier depends on a few factors, such as the climate you live in and the size of your grow room.

If you live in a humid climate, it is significantly more likely that you will need a dehumidifier in your grow room, as the air is naturally more saturated with water. Additionally, the larger the grow room, the more likely it is that you will need to use a dehumidifier as well.

Likewise, living in a dry climate will decrease the chances that you need a dehumidifier. If your grow room is on the smaller side, you may be able to get away without using a dehumidifier.

At the end of the day, it is important to monitor the humidity levels carefully in your grow room and make sure they are within ideal range. If it’s too humid in your bloom phase (above 60%), you will need to use a dehumidifier to bring it down to 40-50% humidity.

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What does a dehumidifier do?

A dehumidifier is a device that removes moisture from the air. This can be extremely beneficial for grow rooms in humid climates, as high humidity levels can lead to problems such as budrot, mold, and mildew growth. Dehumidifiers can help to keep the air in your grow room dry, which can create a more hospitable environment for your plants and less hospital environment for pests.

How do I know if I need a dehumidifier?

You will need a meter that accurately reads humidity levels, such as a hygrometer, to determine whether or not you need a dehumidifier. If the humidity levels in your grow room are consistently above 60%, you will likely need to use a dehumidifier at some point.

How do I choose the right dehumidifier for my grow room / tent?

When choosing a dehumidifier for your grow room or tent, it is important to consider the size of the space that you need to dehumidify. You will also want to consider the capacity of the dehumidifier, as this will dictate how often you will need to empty the unit.


As mentioned above, dehumidifiers can help to prevent mold and mildew growth. They can also help to reduce the risk of powdery mildew, a type of fungal disease that can affect plants. If you are concerned about any of these issues, a dehumidifier may be a good investment for your grow room.

If you are not sure whether or not you need a dehumidifier, or which one is right for your grow, you can always consult with a professional. The experts at Happy Hydro would love to help you find the right dehumidifier or humidifier for your grow room!

Author | Chris McDonald

With two decades of expertise, Chris leads Happy Hydro in redefining sustainable gardening and delights in backpacking adventures, mind-expanding journeys, and creating memories with his loved ones.

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