Shop/Space Heaters - Propane or Keroscene?

[rondog]

How big is your garage? My 18x18 is 324 sq. ft., and you said 600? That's pretty dang big, IMO.

Do you live someplace where you could use a wood or pellet stove? Those double-barrel stoves made from two 55 gal. steel drums work pretty good. You might even be able to poke your propane forced-air heater in the fire door and use that instead of wood.

Those drums will radiate out a LOT of heat once they're hot inside. I worked in a machine shop with one once upon a time. First and foremost should be insulation and drywall to seal the place up and keep the heat in.

I also have good ideas for storage if you're interested. I store tons of stuff on 24" shelves at the top of the walls, near the ceiling. Simple to build from 2x2's and particle board.