That's exactly what makes a Honeywell a Honeywell - what's under the hood.
Don't take my word for it, just ask any HVAC guy.
Fuck HVAC guys.
"Professionals" are almost invariably fucking morons. If they knew what the hell they were talking about, they'd be designing the systems rather than installing them. They live in microcosms of specific interest and practice. Toss a new idea in there and you'll upend their entire world.
There are a few exceptions out there, but I'm not digging through a hundred idiots to find one guy that knows his shit.
The last "professional" I hired got his head stuck in a light bulb. That's not a joke. He genuinely got his head stuck in a circular florescent tube.
I know one HVAC guy that's worth a fuck, and he used to design, manufacture, and install massive NBC filtration systems. I plan to have a conversation with him this week regarding the Nest unit, just for entertainment purposes.
Cheers,
Kennith