Insulation done! Shop heater questions. Electrical gurus.

I think you are onto something by thinking about working with your HVAC friend. I also have a friend who does HVAC for a living and I traded some computer work with him for my HVAC needs in my detached garage. I ran natural gas piping to my garage and he hooked up a natural gas furnace and ductwork to make my garage nice and toasty. I added insulation throughout the garage ceiling some time ago, as that's where the greatest heat loss occurs.

Check with your HVAC buddy and see what he recommends..