Bay Area, just beginning a remodel+expansion of our home. We've never had air conditioning, and our gas furnace is well over 20 years old. We'd likely need to upsize the furnace anyway, and for resale reasons if nothing else, adding A/C (and the attendant larger ducts or whatever else) is a no-brainer while we have the house apart.

A heat pump is absolutely a no-brainer in our case. I like being able to get away from natural gas, although I must say, moving all electric means we'll be held hostage more and more to PG&E. (We have solar, but it'll be well below our needs once we had square footage and the heat pump, and don't want to get screwed by NEM 3.0).