LOWERING HUMIDITY IN GROW ROOMS
SOMETIMES YOU WANT A TROPICAL DAY
(80 degrees F @ 80% rh)
SOMETIMES YOU WANT A DESERT NIGHT
(70 degrees F @ 50% rh)
Plants need lower relative humidity than our small dehumidifiers can deliver.
You’re adding 25 gallons of water a day (200 pints per day) to the plants in your grow room, so you buy a dehumidifier rated at 200 pints per day to control humidity. Everything is fine during the day (or when lights are on), but night climate conditions spin out of control.
Air conditioners remove a large amount of moisture in your grow room while lights are on during the day. They can’t be used efficiently for night humidity control. Cooler overnight climates reduce the water removing ability of all refrigerant dehumidifiers.
A dehumidifier rated at 200 pints a day in warm, moderately humid conditions (80F degrees @ 60% relative humidity) only removes a few pints an hour in cool, dry night environments. If you need to maintain 75F degrees @ 50% relative humidity in your grow room, you must know the rating of your dehumidifier at that condition.