Yea just get a reel for air down the center of your garage ceiling, so you can pull it down to use in either bay.
This is what we have in my dads 3 car garage, and it gets it decently warm in a half hour or so if its really cold out. A detached garage is a different story though, but since its only a 2 stall this should work no problem.
http://www.northerntool.com/webapp/w...6428_200316428
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