I was on a budget at the time so i bought the small unit for inside the tent but they are really hot inside so i used metal ducting tape and cardboard to seal it to a passive air vent outside my tent and it works great. Heat natural lowers Rh , depending on your set up ,like of your using passive vents and exhaust fan you can look into a bigger unit and put it in the room out side your tent, it all depends on your climate and the money you want to spend...