Hey Steve!
If you ever saw the movie 'Old School', in the beginning of the movie, after the wedding scenes, my bread machine is the same one that is re-gifted as a house warming present....anyway...
I was using the black and decker el cheapo heat guns that I picked up for $5 at a garage sale. I now have an older heavy duty Milwaukee Heavy Duty Heat Gun that has an HEAT ON, HEAT OFF ( Blower only), and true OFF Switch, along with an adjustable heat temperature controller. The tube portion of the gun is nearly double that of the Black and Decker version.
I melted the plastic covers on 2 heatguns, and realized that I should use a metal extension of 4 to 6 inches to prevent the plastic from melting. The better built HG is the way to go, as I use the toggle switch to cool down the roast after dumping it onto 2 large aluminum perforated pizza pie pans.
I normally roast 1.25 #'s per batch (green weight) to 2 #'s and have been doing about 3 to 5 #'s a week.
This method works great outdoors, and I'll switch back over to using a GGSC (1450 watt Turbo Oven and Stir Crazy) in the winter months. I'll have a hot fire going in my log stove inside my shop and roasting some coffee my roasting cabinet.