* The "HVAC guy" is more comfortable putting in Janitrol equipment because that is probably what he normally installs. He is used to installing low end builder equipment. The Bryant furnace and A C that you are thinking about putting in is high end equipment your "HVAC guy" probably is not that familiar with.
I think you are wise for wanting to put in better, more efficient equipment. But, you are at a disadvantage if the "HVAC guy" is not familiar with the equipment and/or may not be happy about installing it.