So its that time again, its cold out. How do you guys heat your shops? I've got a decent sized 2 car garage I work in. The walls and ceiling are insulated and sheeted, its not perfect but its better than nothing. I have been using a propane "mushroom" heater to get it warmed up, then an electric wall mount to keep it there. This really isnt ideal and I know it. I dont have 220, nor do I have a gas line or ability to use a wood stove. I'd really like waste oil, but thats not in the budget. Cheap safe heat, does it exsist?