Your exhaust could be another factor in removing the humidity and dropping it so low.....What's the exhaust like...and intake as well ??

The humidifier will help along with a portable AC...which will create some humidity I beleive.
Ya have any pics of your area....sounds cool
Organic Rasta Reviewed by Organic Rasta on . Setting up 10'x12' grow room I've been growing for a while. Minor sucksess. The problem I believe is Not controling the rooms temp & Humidity. Grow room is approx. 10'x 12' x 8' Using 1000 w Super HPS Fill and Drain. Summer time seems to be the toughest. The room temp could rise as 100. A fan running didn't keep it cool enough. Went to sears bought a small room conditioner, installed it in the wall between the garage and the room. Now keep in mind, that the garage temp was at times 112. Living in the deaert Rating: 5