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Don't limit yourself to a mobile home furnace if you go that route. I picked up a 145000 BTU furnace for 400. Doesn't take up much space and heats my 1500 sq Ft great. In my garage at home I have a 240 electric unit like the one you showed and it does a good job on my 2 car garage, except that I hear from my wife about the electric bill when I run it too much.