I have 2 heaters I got from Menard's and used in my old house. They're part number CZQTV5M, google it for accurate specs. They work like radiant heat ones--no fan, just projecting the heat wave towards the area. Worked well enough for specific areas like over a work bench or a more focused area (15x15). Ceiling mounted, 2 settings: 760watt and 1500 watt. You could run them along one wall and separatte them for a broader range of projection. New garage already has built-in heat so I don't need them. Safer than gas since you don't need fresh air and they don't eat up the air in the garage, plus they're out of the way.
$40/pr.
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Bryan-NW 'burbs 1972 Malibu Vaguely stock appearing, and the opposite of restored. 1999 std bore 5.7, Vortec heads, Holley Stealth Ram, GM cam 700R4, Viking coilovers, 12 bolt 4.10 posi, and a whole bunch more