If you have windows in the garage, install storm windows over them. Even one of the plastic insulation kits will provide a dead-air space, which will decrease the heat loss.
The heat loss through glass is staggering. Regardless of what form of heat you choose, double (or better, triple) windows will significantly reduce the energy bill.
Just as a point of reference: my shop is 20 by 40 with no windows, 8 foot ceilings, R-18 insulation in the walls, and R-26 insulation in the ceiling. I have three 240v heaters of 3000 watts each. Turn them on at 6 A.M., and by 9 A.M. temperature is acceptable if the ambient is not less than 25 degrees F.
Jon.
__________________
"Good carburetion is fuelish hot air". 
"The most expensive carburetor is the wrong one given to you by your neighbor".
If you truly believe that "one size fits all" try walking a mile in your spouse's shoes!
Owner of The Carburetor Shop, LLC (of Missouri).
Current caretaker of the remains of Stromberg Caburetor, and custodian of the existing Carter and Kingston carburetor drawings.
Last edited by carbking; 12-01-2014 at 05:15 PM.
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