Thanks for the responses and informative discussion.
My Bad - but my original question about the separate furnace thermostat came from this picture:
Which is a ............Landmark, not a Redwood. And to complicate my memory it turns out the antique looking bi-metallic or mercury thermostat actually is a remote thermostate for the fantastic fan, not the furnace.
Anyway I did go re-educate myself and it looks like the standard heat pump configuration is1 heat pump and 1AC for a total 30,000 btuhs cooling. The ducted return air is all a new design from what I am used to, reducing noise I would imagine. There were two thermostats, but only one had the heat-pump, furnace selection. The other seemed to be just AC.
Good to know the 2nd heat pump might be available. Looks like it woud be a real pain to try and integrate one after the fact.