I've had some great feedback here to help us zero in on an A/C and heat pump solution (Carrier Infinity in particular). We have supplemental heat in both hydronic fin-tube radiators, and hydronic radiant floor heat (but just in 3/4 of the house -- the front half, second floor will only have heat pump).
What we were wondering though while we have all the ceilings (and some walls) torn out is whether we should run boiler water lines up to the attic with the potential to add hyrdronic aux heat to the heat pump.
Would this be worth it? Does hydronic aux heat really work? My husband said he's heard otherwise (from the radiant floor material supplier).
Thanks in advance for your help!