No vent or additional heat is needed but it can't hurt the drying process. Clothes dry on DryAway fully loaded up pushed in at the same speed as if they would on a traditional accordion rack in the middle of that same room. We have had zero issues from customers with mold or mildew. We have had some customers with a floor heat vent in the back on the cabinet which is a simple way to move air in the space without addition mechanical parts.