Stop in for a cup of coffee

I have a forced air house furnace that I wish to use. Otherwise, I will get one of the hanging units (Below - not necessarily the brand/size/style just a pic) Then just trench a line from the natural gas at the house to the garage. Unless I am just as poor as now, then wood stove made from a barrel will have to work.

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What size shop.? And walls/installation?
The natural gas is going up in price here in Arkansas . But it would be the most economical.