Steve,
After many years of the Kerosene heater smell etc, I happened to be at the local hardware emporium one spring and they were closing out the heaters from the winter season. I took a chance and bought a 5000 watt wall hung electric heater. It is not a huge unit, about 2ft x 1ft and 10in deep. It does require a 220 volt dryer type outlet. I have been totally amazed at how good a job it does on my 22 x 22 ft two car garage attached to the house. The walls are insulated, but the ceiling is not, and the door is your standard roll up 2-car door, pretty leaky. I can come home when it is 20 deg outside, turn it on, and by the time I eat something it is at least 65 degrees. Now that I own a machine shop, I dont use it that often, but I was out there the other noght waxing the wifes car and I only had a t-shirt on. It was about 30 deg outside. By the way, I really have not seen any difference in the electric bill. Hope this helps.
Bill
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Bill Koustenis
Advanced Automotive Machine
Waldorf Md