How Many Dehumidifiers Do I Need for Cannabis

The number of dehumidifiers you need for a commercial cannabis operation depends on several factors, including the size of the grow space, the volume of plants, the existing humidity levels, and the capacity of the dehumidifiers you plan to use. Here's a step-by-step guide to help you determine the appropriate number of dehumidifiers:

Preair Pro300 Grow Room Dehumidifier for Flowering Stage

1. Calculate the Total Grow Space

Determine the total square footage of your grow area. For commercial operations, this can range from a few thousand to tens of thousands of square feet.

2. Assess Humidity Levels

Measure the current humidity levels and set your target humidity range for the flowering stage (typically 30-50%).

3. Estimate Moisture Load

Calculate the amount of moisture that needs to be removed. This depends on factors like plant transpiration, watering schedules, and external humidity.

4. Dehumidifier Capacity

Dehumidifiers are rated by the amount of moisture they can remove per day, usually in pints or liters. For commercial purposes, you may need professional dehumidifiers with higher capacity (e.g., 100-500 pints per day or more).

5. Dehumidifier Placement

Consider the layout of your grow space. Dehumidifiers should be evenly distributed to ensure uniform humidity control.

6. Example Calculation

- Grow Space: 10,000 square feet

- Target Humidity: 40%

- Average Moisture Load: 5-10 gallons of water per 1,000 square feet per day (varies based on plant density and watering)

7. Step-by-Step Calculation:

1. Determine Total Moisture Load: For 10,000 sq. ft., assume an average of 7.5 gallons per 1,000 sq. ft. per day.

- Total moisture load = 7.5 gallons x 10 = 75 gallons per day

- Convert to pints (1 gallon = 8 pints): 75 gallons x 8 = 600 pints per day

2. Dehumidifier Capacity: Suppose each dehumidifier for grow room can remove 300 pints per day.

- Number of dehumidifiers needed = 600 pints / 300 pints per dehumidifier = 2 dehumidifiers

8. Adjustments

- Plant Density: Higher density may increase transpiration and moisture load.

- Environmental Factors: Local climate, ventilation efficiency, and insulation can affect humidity control needs.

For a 10,000-square-foot grow space, you might need approximately 2 industrial dehumidifiers with a capacity of 300 pints per day each. Adjust this number based on specific conditions and continuous monitoring of your growth environment.

Regularly monitor humidity levels and adjust the number or placement of dehumidifiers as necessary to maintain optimal conditions.