i don't understand about the keeping area dry. is there moisture accumulating on something? if your rh is too high, a de-huey will help. before i grow in a room, i use a bug bomb. i seal the place up and shut the door. after that, i periodically hang a no-pest strip in the room. if you keep unnecessary items out of the room, that helps too. don't give them a place to hide. if it isn't absolutely necessary for your grow, get it out of the room.