How To Control The Humidity In Grow Tent?

September 09, 2021

How To Control The Humidity In Grow Tent? 

Humidity is important for indoor growing. Healthy humidity levels create fresher, healthier crop. It’s important to avoid extremes when it comes to humidity levels inside your grow room or grow tent. 

Use these guides to learn more on how to control humidity in your grow room: 

  • Why Controlling Humidity Is Important
  • Signs of High and Low Humidity
  • Air Circulation and Ventilation
  • Humidity Monitoring
  • How to Lower Your Humidity Level 
  • How to Raise Your Humidity Level
  • Other Humidity Tips

Why Controlling Humidity Is Important?

Plants are constantly taking in water to absorb nutrients and grow to their full potential. Humidity changes how much water your plants take in, controlling your humidity also gives you control over the plants’ nutrient intake. 

Signs of High and Low Humidity

Humidity levels are important in indoor growing for various reasons: 

  • Too high humidity can cause mold and bud rot (ruining plants). Bud rot is the single biggest problem when it comes to humidity and growing. It makes plants completely unusable. 
  • White powdery mildew can show up on leaves in areas with high humidity environments. 
  • Too low humidity means slow growth and poor leaf development. 

Additionally, for optimal growing and plan production, the early stages require higher humidity levels than the rest of the growing cycle. It’s common to add a humidifier to grow spaces during the early clone growing stage, while a dehumidifier may be required later in the growing process. 



1. 12L Large capacity ultrasonic humidifier

2. 1L large mist output per hour

3. Mist output can be adjustable


Product Features:

  • Keep Your Grow Space Comfortable:  ECO Farm 80L dehumidifier can quickly and quietly remove moisture from the air per day, fits for medium to large rooms. You can adjust ideal grow space humidity for maximum comfort easily!
  • Smart control panel: Multi-function buttons, easy to operate at a glance. Digital display control panel offers a convenient and accurate humidity level readout, you can operate it easily.
  • Quiet and Safe Operation: It is ultra quiet operation that won't disturb you when you sleep or at work.
  • Auto stop and warn with indicator light when water tank is full  
  • Built in handle: ergonomically designed, without edges, protect the hand from injury; 
  • Conveniently moved: solid 360° universal caster

Air Circulation and Ventilation

Properly airflow in your grow area can help fight off certain issues like the white powdery mildew. It also helps bring in fresh air (when you want it), avoids stagnant humidified air from causing other issues to your plants. 

For people with slightly high humidity, a dehumidifier may not be needed. Increasing the ventilation in your space with a powerful exhaust fan can also help. This is an ideal solution for people who live in areas with low relative humidity (so the air coming in is lower than the humidity level inside). 

Ventilation kits can also help increase or decrease room temperature if desired. Lastly, CO2 settles at the bottom of your room, so airflow is important for the life of your plants as well.  

Temperature and Humidity Monitoring

The best way to know the exact temperature and relative humidity in your grow room is by adding a monitor.
There are various options available, many of which allow for remote monitoring from other rooms.
If you’re looking for precise growing conditions, these are fairly inexpensive and the best way to monitor humidity.

Lower Your Humidity Level 

Live in an area with high humidity or does your grow room suffer from high relative humidity? Or do you just want to create the perfect flowering conditions between 40-50% humidity?
ECO Farm Dehumidifiers front either way, the best way to lower your humidity level is with a dehumidifier. Dehumidifiers pull moisture from the air in grow rooms or grow tents. They come in a variety of sizes, from portable units for small rooms, to large, industrial dehumidifiers for large grow spaces.
Keep in mind dehumidifiers collect moisture, so they need to be emptied or drained. Look for dehumidifiers with onboard humidistats that maintain a set humidity level automatically. They make it simple to maintain a consistent humidity level that you can change throughout the growing process.

Raise Your Humidity Level 

The easiest way to increase your humidity level or maintain a specific humidity level in a room with low humidity is to add a humidifier. Look for large humidifiers with several-gallon tanks - or you may need to refill them often.

Other Humidity Tips

  • Take care of standing water - this can add more humidity to your space than you may think. 
  • Consider lights - when the lights are turned off, the temperature will drop. This leads to an increase in relative humidity. 

OK, that's all. It's my honor to tell you how to control our grow tent humidity. If you have any other questions about greenhouse system, welcome to contact us. Our website:

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WhatsApp: +1 206 581 5521

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