i realize this post is old but anyone happening upon this in the name of research should know:

humidity is relative. that is, a reading of 35% RH @ 75 degrees has less water in the air than a reading of 35% RH @ 85 degrees.
gedogen Reviewed by gedogen on . How to raise humidity? Hi, I need to raise my growrooms humidity, it's usually between 30-40%... Any recommendations on raising humidity? I tried using jar of water, not much results... Was thinking of wet sponge, would this work? Any tips much appreciated. Thanks:thumbsup: Rating: 5