I've got a closet in my garage that I want to turn into a grow room. The garage is not temperature controlled, and temperatures can range from 30s in the winter up to 100 in the summer. The other side of the back wall in the closet is the inside of the house, and there is an attic above the closet. Has anyone set up a grow in this kind of situation? Any advice on how to control the temperature in the winter and summer? Also, has anyone tried venting into an attic, or does it really need to lead outside?