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How to choose a suitable size of the dehumidifier for your growing room?


After completing the basic introduction to the size and characteristics of the dehumidifier, now let’s begin to find the appropriate size of the dehumidifier for your growing system.

The following are some calculations that is worth to spend some time to do so. It is important to match a suitable dehumidifier solution.

Factor 1: Application area of dehumidifier

First, we will conduct a preliminary selection of the size of the dehumidifier through the indoor application area (length x width x height) of the growing room (the default height is 10 ft). A dehumidifier with a dehumidification capacity of 200 pints/day can be used in a growing room of 1,600 sq.ft and 10 ft high under normal working conditions. If this is an 8,000 sq.ft, 10 ft-high growing room project, the amount of dehumidification that needs to be matched is 1,000 pints/day. This is only a preliminary forecast of the required dehumidification capacity. Specifically, it is necessary to determine the required dehumidification capacity based on more environmental factors.

Factor 2: The annual average temperature and humidity of the growing room

In addition to the external weather, the temperature and humidity values in the growing room are also affected by the indoor growing system. It mainly reflects in the following:

1. The indoor temperature drop or rise caused by central air-conditioning refrigeration. Changes in ambient temperature will directly affect the amount of dehumidification.

2. The water source caused by humidifiers or plant watering. The water produced by plant transpiration or photosynthesis directly affects the humidity of the environment.

Factor 3: Ventilation equipment

In addition to the central air-conditioning that will bring fresh air to the room, the ventilation fans or other ventilation equipment equipped in some growing rooms will also bring fresh air to the indoor environment, which indirectly affects the relative humidity of the room. Because the fresh air contains a certain amount of moisture, it will affect the dehumidification effect of the dehumidifier. We can judge according to the size of the fresh air volume and whether the fresh air is internal circulation or external circulation, and choose a more appropriate size of dehumidifier. For example, a 1,600 sq.ft growing room is equipped with a large-volume ventilation fan. At the same time, the fresh air belongs to the external circulation one. Under normal indoor conditions, the external fresh air brings more moisture, which directly affects the dehumidification effect of the dehumidifier. Conventionally, only one dehumidifier with a dehumidification capacity of 200 pints/day is required, but now two or even three dehumidifiers with the same dehumidification capacity are required.

Factor 4: How much water do you feed the plants?

The transpiration of plants will leave steam in the nearby air, which is the reason why your growing room becomes humid. And it is also an introductory knowledge of hydroponics. Therefore, if you make an approximate assessment of the amount of water used to irrigate the plants, this will provide a reference for the amount of indoor water (pints) you need to take off.

For example, if you have 30 plants in your growing room, you generally need to irrigate at least 1 gallon of water for each plant every day.

Now let us look at the calculation steps of the amount of dehumidification required by the growing room dehumidifier.

30 plants x 1 gallon = 30 gallons (the total amount of water needed for 1 day)

1 gallon = 8 pounds

30 gallons = 30 x 8 pounds = 240 pounds

1 pound = 1 pint

240 pounds = 240 × 1 pint = 240 pints

In summary: "The amount of dehumidification required = the number of plants x the number of gallons per plant per day x 8".

In this way, you need a dehumidifier that can remove 240 pints of moisture from the air every day. According to this calculation rule, you can evaluate the number of dehumidifiers that you need to equip for the growing room.

Factor 5: The species of the plant and the relative humidity value you want to achieve

Because each plant has different requirements for environmental temperature and humidity habits, we need to judge the humidity range that it needs to reach according to the type of plant, so as to match the appropriate dehumidification solution. For example, in North America a common cannabis growing room requires a relative humidity value in the range of 40%-60%. If wet spots are forming on the leaves, humidity levels are too high. Flowering Plants: The humidity levels of cannabis plants at the beginning of the flowering stage should be lowered to 40 to 50 percent. At this time, our DOROSIN cannabis dehumidifier can come in handy. For the quality and yield of the cannabis grown, the growing room dehumidifier plays a key role in controlling humidity.



The above is our guide on how to calculate and choose the dehumidifier for your growing room. Following the above calculation rules and related factors, you will never encounter a growing room with humidity imbalance again. DOROSIN has been committed to the development and production of growing room dehumidifiers for many years, which has brought a lot benefits to the majority of industry. In the future, we will continue to maintain our consistent philosophy and provide people around the world with more professional and comprehensive temperature and humidity solutions.