Just finished talking with the references provided, including residential and commercial installs. Everybody seems really happy with the contractor and his work. Some have used him for years. One works in the distributors local office and says he only recommends this contractor and wouldn't use anybody else himself.
I would still appreciate more guidance on the previous questions on the York versus Honeywell VisionPro IAQ. If I can't get my story straight he seems set on giving me an as yet unspecified York. Doesn't sound like any of the York thermostats utilize the Affinity HP and furnace for maximum comfort. Still hoping I can get him to include the cheapest York that satisfies the rebate and then either ask for the Honeywell at cost or even buy it myself from Amazon. Hope that approach wouldn't offend anybody.
PS: I believe at least here the York rebates are extended til the end of August.