Electric or heat pump?

Framing a 16x34 2 story attached garage with 2 bedrooms over top in New York State. Currently 25 cold degrees outside. I'm looking at heating/cooling options. My current HVAC forced hot air propane powered system won't reach to the new addition. This seems to be the cheapest...I can install electric baseboard heat to both bedrooms and put a small electric heater in the garage to use when needed with a/c window units in the bedrooms for summer. I've seen radiators that install on the wall. If there was a small enough boiler that is the sizeof an on demand hotwater tank I could install that in the garage and run a propane line to it. I'm looking for recommendations. Any help would be much appreciated.