A great temperature for any growing environment is between 68-78F (20-26C). A 5 degree drop from lights on to lights off works well. Once you have your temperatures dialed into this range, use the Vapor Pressure Deficit / VPD chart below to match up the proper relative humidity to your temperature. Anything in the green zone is optimal.
What Temperature should my Grow Room be?
Updated on November 11, 2019