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Dehumidifiers for Growing Cannabis

Cannabis exhibits a high sensitivity to humidity levels, making it vulnerable to various humidity-related ailments such as botrytis, downy mildew, and Alternaria. Employing a dehumidifier weed within the cultivation environment proves to be the most effective strategy for both preventing and eradicating these diseases. Additionally, the utilization of a dehumidifier not only serves as a protective measure but also fosters optimal growth conditions, thereby enhancing the overall quality of the cultivation and augmenting the dry weight mass of the cannabis yield.


dehumidifier weed

Dehumidifiers are devices crafted to diminish the humidity levels within a specific space. A prevalent use of dehumidifiers is in residential settings where individuals employ them to regulate indoor humidity for enhanced comfort and to thwart the proliferation of mold and mildew, which flourish in humid environments. Beyond domestic usage, dehumidifiers find practical applications in commercial and industrial contexts, including environments like indoor swimming pools, gyms, ice rinks, storage warehouses, and various other settings where humidity control is essential.

How Does a Dehumidifier Work?

dehumidifier weed

There are two primary categories of dehumidifiers available in the market:

  • Refrigeration dehumidifiers: These devices operate by pulling in air from the surroundings across a refrigerated coil. The moisture content in the air condenses on the coil and subsequently collects in a tray or bucket for disposal or recycling.
  • Desiccant dehumidifiers: In these dehumidifiers, ambient air passes through a wheel coated with desiccant, a substance that absorbs water, such as silica gel. Instead of dripping into a tray, the water absorbed during the adsorption process is expelled during regeneration. This involves evaporating the moisture from the desiccant using warm air. The now-moist air condenses on a metal plate, and the resulting water drips into a collection tank.

What Should You Consider When Choosing a Dehumidifier for Your Grow Room?

Whether you’re an experienced cultivator or embarking on your growing journey, the necessity of a dehumidifier to manage humidity levels in your cultivation space is likely. In the discussion below, we will discuss the key considerations when selecting a weed dehumidifier for your indoor cultivation area.

1. Budget Consideration

Your budget significantly influences the type of dehumidifier you opt for. Neglecting the use of a dehumidifier often leads to mold or pest problems that can jeopardize your entire harvest. Thus, it’s crucial to factor in both the purchase and operational costs of a dehumidifier early in your planning and budget accordingly. This is an essential piece of equipment where cutting corners is not advisable.

2. Portable vs Fixed Dehumidifiers

The choice between portable and fixed dehumidifiers involves weighing the advantages and disadvantages. Portable models offer flexibility, allowing you to easily relocate them within your cultivation space or transfer them to a new area if needed. On the other hand, fixed dehumidifiers are less hands-on as they automatically channel collected water into a drain or larger container. However, their setup is more intricate, making them suitable primarily for larger, permanent cultivation spaces.

3. Reservoir Volume

The reservoir volume is a crucial factor when selecting a dehumidifier for your weed cultivation area. Larger reservoirs require less frequent emptying but often occupy more space and come with a higher price tag. If space is limited, you might need to compromise by using a smaller dehumidifier and emptying it more often. Conversely, if space and budget constraints are minimal, or your cultivation space is frequently unattended, a dehumidifier with a larger reservoir might be a preferable choice.

4. Grow Room Size

While most dehumidifiers in the market are generally efficient in managing relative humidity in small grow rooms or tents, larger cultivation spaces demand more substantial units. If you’re an adept grower managing a sizable cultivation space, investing in a larger dehumidifier grow tent becomes imperative to effectively control humidity levels.

DIY Dehumidifier for Grow Tent

For those with limited financial resources, constructing a do-it-yourself (DIY) humidifier for grow tent is a feasible alternative. Although it may not offer durability or performance comparable to commercially available dehumidifiers, it could serve as a viable option, especially for individuals facing extremely stringent budget constraints.


  • 2x 20l buckets
  • Large bag of rock salt
  • Drill


  1. Utilize your drill to create drainage holes in both the bottom and sides of one of your buckets.
  2. Position the perforated bucket inside the one without holes.
  3. Empty rock salt into the upper bucket.
  4. Install the dehumidifier within your cultivation space and monitor the reservoir daily.

The underlying idea is straightforward: the rock salt in the upper bucket will attract moisture from the air, leading to condensation and a subsequent drip into the lower reservoir bucket. The humidity levels in your grow area will influence the amount of water the dehumidifier collects and the frequency at which you should replenish the rock salt.

It’s important to note that while this DIY dehumidifier cannot rival the efficiency of domestic, let alone commercial, counterparts, it serves as a modest measure to regulate humidity in your cultivation space.

Do you need a Dehumidifier for Cannabis Cultivation?

Effectively managing humidity presents a common challenge for both novice and seasoned cultivators. Fortunately, the availability of dehumidifiers simplifies the task of maintaining optimal humidity levels in your indoor cultivation space throughout the entire year.

Although standalone dehumidifiers may not be universally applicable in every indoor grow setting, some form of dehumidification becomes essential. This process plays a crucial role in indoor cultivation operations and demands careful consideration to align with your specific requirements. It’s essential to recognize that humidity levels constitute an integral aspect of the overall grow room environment and should be addressed as part of the entire system. Investing in a dehumidifier from the outset provides comprehensive control over the humidity in your grow room or tent. Alternatively, consider exploring the DIY options mentioned earlier if budget constraints are a concern.

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