Mine is 20x24, so if you picture that as a rectangle short side down mine would be about 6' up and 4' left of the lower right hand corner. Said 4' earlier but remembered it's hung on the next joist. This puts it between the path in from the man door and the overhead (both on same wall behind heater). It's kinda aimed across the shop. It's just "this side" of the overhead door rail and mounted to a joist and straight out from the breaker panel - all more a convenience spot than anything scientific. No light there, away from the wall (got something -shelving, stuff, etc on nearly every wall near the ceiling), easy for power. I'm 6'1" and can walk right under it (8' ceiling, no drywall). HTH. In testing I can feel the warm air moving at the tool box and lathe bench, which is about 18' away from the heater. The work benches are on the upper side and both left and right, so having it swivel a bit lets me point it where I might be working. The reviews lead me to believe it should warm the place up all over without too much trouble.