As a contractor, and knowledgable in both hvac, plumbing and some electrical work (enough to be dangerous) i swear by "never trust a fat contractor".  If you cant fit into the spaces to do the job, how do you do it correctly? And on an average day i am lifting and carrying so much shit, climbing ladders, walking roofs and trusses, i dont go to a gym (yet) and burn extra calories pretty easily.  If a contractor is fat, then sonething isnt adding up...