i have 2 of these heaters. they do 500 sq. ft. each. its 20* outside today and it took about an hour to get to 60* in my uninsulated 990 sq. ft. garage. once its warmed up only one heater stays on to maintain temp. don't need electricity for them either.
http://www.lowes.com/pd_296654-2156-MH25LP_4294934542+5003701__?productId=1243043&Ntt= radiant&pl=1¤tURL=%2Fpl_200%2B400_4294934542 %2B5003701__s%3FNtt%3Dradiant&facetInfo=$200%20-%20$400
only bad thing about turning them on and off all the time is when they start heating the garage a lot of the cold metal gets condensation on it. it goes away once the garage is warmed up and i haven't seen any rust on the bare metal or my tools so i'm not worried about it.
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