I have a large garage, 30'x 40' here in Wisconsin.
I would like to build an enclosed heated area on the inside maybe 10'x 15' and 9'high ceiling inside of it for a work area rather than heat the entire garage. I'm thinking infrared propane heat, or electric of some type, and insulate the walls and ceiling to the maximum. No windows and one door. I want to heat this with the least possible expense incurred on the actual heaters and the cost of operating it yearly. Any thoughts or suggestions?