We hung the heater, and are hoping to get the wiring in place next weekend. The trick in locating the heater was placing it where Joe wouldn't hit his head on it, coming into the garage. The hatch on the ceiling was cut when the insulation was blown in, and lets us take a look at the garage roof to check on things. It's already a lot warmer in the garage, even without the heater on, so we're hoping that this unit will do the trick.
Slow going, but at least we're progressing in the right direction!