Flowering Humidity

Ghettobird209

Active Member
My grow closet has been really really high humidity idk how and why forsome reason at all times, like no lower than 60% sometimes gets like 80% what should it be?
 
hey 'bird- may want to consider a dehumidifier. if its 60-80 with lights on, it will be close to 100 when the temps drop during lights out. make sure you have good air circulation till you can drop that humidity level to 40-50%
 
What's your normal humidity? Plants give off moisture and can raise the RH fairly fast in an enclosed area. I never have that issue since it's normally 20% RH year around in my house / grow area. Yeah, get a de-humidifier or find a way to pipe in fresh air.
 
RH raises when the temp drops. When the lights are on and it is warm they transpire more water, adding to the Absolute Humidity. Then the lights go out and it cools. The AH will remain the same, but the RH rises, since it is relative to the air temperature. Warm air has the capacity to hold more water, or AH.

Here's a fun fact, or rule of thumb that works out: For every 20 degree F the air temp goes up, the RH will reduced 50%. It works out pretty darn close. Check it out yourself. If in the morning, (outside weather-wise) it's 50 degrees and 80% humidity, when the temp hits 70 degrees the RH will be 40%.
 
Ya what everybody said. Your best way to lower humidity is to raise temp and increase air flow. I have a similar problem trying to keep it under 60 when the lights go off. I have resorted to getting a black out curtain to hang in front of my tent so I can prop the tent open a little then have my little heater outside the tent.
 
Back
Top