How to Calculate Dehumidifier Size for Grow Room?

The method to measure the appropriate greenhouse dehumidifier size

Calculating the appropriate dehumidifier size for a grow room involves considering several factors, such as the room's dimensions, the desired humidity level, the number of plants, and the environmental conditions. Here's a step-by-step guide to help you calculate the dehumidifier size:

 

Determine the room volume

Measure the length, width, and height of the grow room in feet. Multiply these dimensions to obtain the room's volume in cubic feet.

Assess the desired humidity level

Determine the ideal humidity range for your plants during the different stages of growth. Typically, it is recommended to maintain humidity levels between 40% and 60% for most plants. However, certain plants may have specific requirements.

See the article: “What Is the Best Humidity Level for a Grow Room”

 

Calculate the moisture removal capacity:

To determine the capacity of the capacity of the dehumidifier for greenhouse needed in pints per day (PPD), you can use the following formula:

PPD = (Room volume in cubic feet * Desired humidity change) / 60

The desired humidity change is the difference between the current humidity level and the desired humidity level. If the current humidity is higher than the desired level, the humidity change would be a positive value.

 

Consider additional factors

Depending on the specific conditions of your grow room, you might need to adjust the dehumidifier size. Take into account the following factors:

    a. Number of plants: If you have a large number of plants in your grow room, they will release moisture into the air through transpiration. You may need to increase the dehumidifier's capacity accordingly.

    b. Room insulation: Poor insulation can lead to moisture infiltration from outside. If your grow room is not well-insulated, you might want to choose a slightly larger dehumidifier.

    c. Environmental conditions: If your grow room is located in a particularly humid area or experiences high ambient humidity, you may need a more powerful dehumidifier.

 

Select a dehumidifier for plant room

Based on the calculated PPD, choose a dehumidifier with a capacity that matches or exceeds the calculated value. Dehumidifiers typically have their capacity specified in PPD, so you can easily compare different models.

Remember to consult the manufacturer's specifications and recommendations for the dehumidifier you intend to purchase to ensure it can handle the conditions of your grow room adequately.