I’m next door in RI in a town bordering Mass.

Ductless for the basement and ground floor. Ducted ductless in the attic for the upstairs (2 BR and bathroom). They’re Mitsubishi Hyper Heat units and work great even in very cold below-zero temps. No propane or other backups. The house had an older gas furnace with baseboard heat that I could use in a pinch but I’ve never needed to use it. I will probably have it ripped out and the gas line for it capped, because it’s quite old and I could use the space in the basement.

One of the biggest “Diamond” contractors for Mitsubishi cold weather ductless is Superior Comfort. They service RI and most of SE Mass. Diamond contractor employment gives you a longer warranty on the unit.

I fully expect this system to last 20+ years. They’re reliable workhorses.