How to Best Reduce Greenhouse Humidity?

Reducing greenhouse humidity is important for plant health and to prevent mold and fungal growth. Here are some effective ways to manage humidity levels:

 

1. Improve Ventilation

   - Install Vents: Place passive or active vents in the greenhouse to allow air circulation and moisture to escape.

   - Use Fans: Install circulation fans to increase airflow, which helps reduce the amount of moisture in the air.

 

2. Greenhouse Dehumidifiers

   - Commercial Dehumidifiers: Use a grow dehumidifier designed for greenhouse environments. This is especially useful in humid climates or during rainy seasons.

   - Celing-Mount Units: If the greenhouse covers a large space, an industrial size dehumidifier can be a more cost-effective solution. PREAIR dehumidifier company provides two series ceiling mount dehumidifiers for grow room, the PRO series and the ZETA series. Contact us if you are a commercial grower.

 

3. Control Watering

   - Water Plants Early in the Day: Watering in the morning allows plants to dry off before nightfall, reducing the amount of moisture in the air.

   - Avoid Over-Watering: Too much water on plants or the soil can increase humidity. Use drip irrigation systems or water at the base of plants rather than overhead watering to limit moisture on leaves.

 

4. Use Absorbent Materials

   - Desiccant Packs: Place desiccants such as silica gel or calcium chloride in areas where humidity is consistently high to absorb moisture.

   - Hygroscopic Materials: Consider using materials that naturally absorb moisture, such as certain types of activated charcoal or clay pellets.

 

5. Temperature Control

   - Increase Temperature: Warmer air can hold more moisture, so slightly increasing the temperature of the greenhouse (during the day) can help maintain a balance of humidity.

   - Shade Cloths or Heat Lamps: These can be used to help regulate temperature and prevent excess moisture from settling in the cooler parts of the greenhouse.

 

6. Use Plastic or Shade Netting

   - Cover the Greenhouse with Dry Plastic Sheets: Using plastic sheeting on the roof or walls can help reduce humidity by limiting water condensation.

   - Shade Netting: Installing shade cloth can also help control light and temperature, indirectly controlling humidity levels.

 

7. Regularly Check for Leaks or Spills

   - Make sure there are no areas of water pooling or leaking into the greenhouse, as stagnant water increases humidity.

 

By combining several of these strategies, you can better control the humidity levels in your greenhouse and create an optimal growing environment for your plants.