My house is approx 1800 square feet (not counting basement). It's a two story colonial.
My heating/cooling system was about 16 years old and was pooping out. I live in an area that gets cold in the winter and was sick and tired of the heat pump (plus it was so inadequate for the cold that I was using emergency electric quite often and my untility bill was high). I have always liked gas so went with propane as my backup system.
I realize that he didn't install the ductwork, but feel that he let me down by not warning me about the possibility of poor duct work being my problem.
So... now you've really got me concerned. This damper/zoning is real expensive. That's just great. I would have had that fixed, kept my klunker for a couple of more years, and then gotten a new furnace/heat pump.