Do I need a dehumidifier for cannabis?

Cannabis is a plant that thrives in mid-to-high-humidity environments. Typically, ideal humidity levels for cannabis range between 55-75% relative humidity (depending on strain, temperature, and stage of the growth cycle).

When growing cannabis indoors, you’ll want to simulate the conditions of its native climate as much as possible, while also making timely adjustments to parameters to elicit the highest yielding and best quality response from the plant.

And although cannabis responds best to moderate amounts of humidity in the cultivation space, you must prevent your humidity levels from rising too high. This is especially critical during the vulnerable weeks of dense bud production during the second half of flower.

To achieve this, you must maintain a balance between air conditioning, the heat that lights and other equipment give off, the transpiration rates of the plants, and the amounts of water being introduced to the grow space.

Depending on your situation, you will likely need to incorporate dehumidifiers into your mechanical design.

What is a Dehumidifier?

Your dehumidification requirements, or dehumidification load, is based on your plants’ transpiration rates, which are directly connected to irrigation volume, and any evaporation of water not being used by plants (such as run-off that isn’t drained from the room).

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Photo: Surna