Why Is the Humidity so High in My Grow Room

Pro230 Grow Room Dehumidifier with Remote Control

High humidity in a grow room is typically caused by a combination of environmental factors, plant activity, and equipment setup.

Common Reasons for High Humidity in a Grow Room

1. Transpiration from Plants

Plants release moisture into the air through transpiration. As your plants grow larger and more numerous, they contribute more water vapor, increasing humidity.

2. Overwatering

Excess water in the soil or growing medium can evaporate, adding moisture to the air. Ensure you're watering appropriately for your plants’ needs.

3. Poor Ventilation

Inadequate airflow prevents moist air from being exchanged with fresh, drier air. If your grow rooms do not have enough exhaust or intake fans, excess moisture will be trapped inside.

4. Insufficient Dehumidification

If your dehumidifier is undersized, malfunctioning, or improperly placed, it might not be able to handle the amount of moisture in the air. So growers need to purchase a properly sized dehumidifier and calculate the number of dehumidifiers.

5. High Ambient Humidity

If the air outside your grow room is already humid, it can raise the overall humidity inside. This is especially common in humid climates or during the rainy season. If your grow rooms are located in a tropical area, it is necessary to apply professional dehumidifiers for your plants.

6. Evaporation from Open Water Sources

Standing water from reservoirs, hydroponic systems, or spills can evaporate, adding to the humidity. Cover open water sources when possible.

7. Heat from Lights

Grow lights, especially high-intensity ones, can warm the air, increasing its capacity to hold moisture. When the lights are off and the temperature drops, this moisture condenses, causing spikes in humidity.

8. Closed System Without Regulation

A sealed grow room without ventilation or a humidity control system can quickly become too humid due to transpiration and evaporation.

How to Fix High Humidity in Your Grow Room?

We can obtain some corresponding dehumidification methods based on the reasons analyzed in the previous text. You can follow the procedures to control humidity.

Improve Ventilation:

Use exhaust and intake fans to cycle out humid air and bring in fresh air.

Add a Professional Dehumidifier with Remote Control:

Ensure the grow room dehumidifier is properly sized for your room and placed optimally. PREAIR supplies the best dehumidifier for grow room. The grow room dehumidifier with drain hose can be controlled by a third-party controller (eg. Trolmaster). If you are a commercial grower and want to solve humidity problems, please get in touch with us as soon as possible.