CO2 Optimal Temp is 85 so I would Higher the temp as far as the humidity for $179.00 go to the Depot and pick up a 45 Pinter.... It will drop it down I have a sealed room... No way you want a Intake or Exhaust... Dehumid is the way to go to do all that work and then catch the mold would really SUCK... The other Option is grow a Strong High resistant strain against mold (CHURCH) I'm growing it out now!!!