Oh, okay, thanks! I may have to pursue that route (although I hope I won't)!
It is now raining, so I'm despairing of EVER seeing the contractor's face again. Meantime, I am looking into some of hte organizations and certification bodies that are involved in the HVAC field. I've heard about ACCA and NATE (we are basically screwed in our area on both of these counts). Any others that might signify a good company?