Thanks for even more ideas, guys!
I think I'll go with good insulation and (almost*) completely electric: a mini-split per bedroom, multiple mini-splits in the "big room", all powered with solar and a battery, potentially with VRF if that's more efficient. *Then I'll have a gas fireplace mostly for looks and for a few extra cold nights (it got down to 38F yesterday). For the extra hot days I'll bring out some floor fans.
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