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Grow Room Dehumidifiers

In a greenhouse or indoor growing area, a certain amount of humidity is desirable but when it gets too high it can cause a world of troubles.  Moisture can build up on leaves which can cause a fungal infection and it can condensate on the ceiling which can infect other plants as it falls.

In a growing room environment excess humidity can condensate in the walls which can result in a deadly mold carrier and eventually weaken the structure.  Some of this humidity can be controlled through good ventilation and fanning.

It’s tough to predict humidity because water practices vary so much between growers, coupled by the fact that 97% of the moisture a plant receives is lost to evaporation.  You’re accumulating moisture in the air from two main sources, the soil and the plants.

Some of this can be controlled through good greenhouse management practices.

There are three main factors that play a role in humidity.

  • Temperature
  • Watering
  • Ventilation

There are good practices that can be adapted to better manage humidity.

Good temperature control

Temperature can be a major player in reducing the production of excessive humidity. Temperature can be controlled to prevent the accumulation of moisture.

Heating helps increase the capacity of the air to carry off moisture and a consistent temperature will prevent the buildup of moisture caused by varying temperatures.  Keep your temperature during the day cool enough to prevent the formation of dew and heating it at night to maintain consistency.

Improved watering techniques

Sloppy watering habits will result in unnecessary moisture buildup. In a hydroponic setting, be certain your flow is even and controlled. Avoid conditions where water is being sloshed around and creating a lot of splash.  This not only prevents overly high humidity, it also helps preserve your precious nutrient solution.

Adequate ventilation

Make certain you have large enough vents and a reliable air moving system to keep the air well circulated and the growing area well ventilated.   This will prevent some of the buildup of moisture that will later reform and condensate.

You probably will not eliminate the need for a dehumidifier if growing with 4 or more lights due to the high level of perspiration from all of the plant you’ll be growing

Unless you are an extremely small grower in a confined, easy to manage space, there will be a need for a dehumidifier.   There are simply too many contributing factors to humidity and there are times that it will need to be removed through mechanical means.

A well-sealed room with an air conditioner will remove some excess moisture. If you check the specs for your A/C it will state how many pints per day that it is able to remove.  On the other hand, if you’re using CO2 in your room, that will increase the humidity levels due to heightened perspiration from excelerated plant growth. 

How to calculate the size of a dehumidifier for your grow room

Surprisingly, calculating the size humidifier your facility requires isn’t all that complicated and thankfully you don’t need to be a mathematician to make this calculation.

Simply estimate the amount of water your plants receive each day. If you have 10 plants, for example and your watering a gallon a day, that is 10 gallons of moisture that will need to be removed from your room each day.

Dehumidifiers, however, are measured in pints but simply multiply the gallons by 8 to convert to pints.  In this case it’s simple, 10 gallons X 8 = 80 pints that needs to be removed.  

To put that all in an easy to understand mathematical formula it will read;

{Amount of water X number of plants= gallons X 8 = pints to be removed.}

If you grow in soil and water every other day all you need to do is divide by 2.

All said and done, a dehumidifier is one of the smaller investments you will make that has a major impact on the quality and health of your plants.


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