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Having a Problem with Temp and Humidity in My Grow Tents

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Managing temperature and humidity in grow tents is crucial for the health and productivity of your plants. Here are some tips to help you stabilize these conditions:

Pro165 Dehumidifier for Grow Tent

Temperature Control in Grow Tents

1. Ventilation:

- Exhaust Fans: Use high-quality exhaust fans to remove hot air from the grow tent.

- Intake Fans: Ensure fresh air is being pulled into the tent to replace the hot air being exhausted.

- Oscillating Fans: Use oscillating fans inside the tent to promote air circulation and prevent hot spots.

2. Lighting:

- LED Lights: Consider using LED grow lights, which generate less heat compared to traditional HID lights.

- Light Distance: Adjust the height of your lights to ensure they are not too close to the plants, which can cause heat stress.

3. Air Conditioning:

- Portable AC Units: If the ambient temperature is too high, a portable AC unit can help maintain the desired temperature inside the grow tent.

4. Cool Mist Humidifiers:

- These can help to cool down the temperature slightly while adding humidity to the air.

Humidity Control in Grow Tents

1. Dehumidifiers:

- For High Humidity: Use a grow tent dehumidifier to reduce excess humidity. This is especially important during the flowering stage to prevent mold and mildew. PREAIR is a reliable dehumidifier manufacturer that has many professional experiences. Please contact us if you need instructions for humidity control.

2. Humidifiers:

- For Low Humidity: Use a humidifier to add moisture to the air if the humidity is too low, particularly during the vegetative stage.

3. Ventilation:

- Proper ventilation also plays a crucial role in controlling humidity levels. Ensure that your exhaust and intake systems are functioning efficiently.

4. Watering Practices:

- Avoid overwatering, as this can raise humidity levels. Use proper watering techniques and ensure adequate drainage.

Monitoring and Adjusting

1. Hygrometers and Thermometers:

- Place hygrometers and thermometers at canopy level to monitor the temperature and humidity accurately.

2. Controllers:

- Use environmental controllers to automate the operation of fans, humidifiers, and professional dehumidifiers based on real-time readings.

3. Routine Checks:

- Regularly check and adjust your equipment to ensure they are working correctly and maintaining optimal conditions.

Ideal Ranges of Temp and Humidity in Grow Tent


- Vegetative Stage: 70-85°F (20-30°C)

- Flowering Stage: 65-80°F (18-26°C)


- Seedling/Clone Stage: 65-70%

- Vegetative Stage: 40-70%

- Flowering Stage: 40-50%

- Late Flowering Stage: 30-40%

By following these tips and continuously monitoring the conditions inside your grow tent, you can create a stable environment that promotes healthy plant growth.


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