When we lived back in Ohio, my mancave was in the attic. I'll tell you from experience, it gets cold in the winter, and cold in the summer. If I were you, I'd put the brakes on the wood stove idea. Holly is an ibsurance agent, and she knows form dealing with it, unless the house was built with the idea of having a stove, you insurance will be null and void should anything happen. In my old mancave, I put a 40$ electric heater in there, from Wal-Mart. I kept it on low all day, and turned it up, when I was in it. It was comfortable. In the summer, I put a small window a/c unit at one end, and a fan at the other end, to pull the hot air out, and cool ait across the room. It was bearable this way. It was also insulated very well, wich is something you must do. If you heat your attic, and are not insulated properly, snow will melt on the roof, and the water can run down into the walls, freezing there, or behind the gutters, and pull them down. Again, insurance is off the hook, because it is a flaw in the workmanship.