I've been reading more, seems like a vented propane heater is better than a vent free but a vented heater cost more than I really want to spend. If I were just using the buddy heater for a few hrs while hunting no big deal but I plan on sleeping in this during deer season with my son and don't want to worry about it. Seems like a small wood stove properly installed should be worry free and might cost less than a vented system. Thoughts?