You'd have to modify it to get it hotter. Popcorn pops below 360?F, and I don't think that any of these commercial poppers go over about 400?F or so. They rely on the oil to efficiently transfer heat, so just dumping coffee into one with only air and metal contact would be less efficient. You might wind up with tipping if you did this (modified for higher heat) without the airflow of a turbo-oven.