Marion County is mainly served by Indianapolis Power & Light, whereas Hamilton and Boone Counties are served by Duke Energy.
this is an arguable debate. The bigger question is comfort. Heat pumps work on the reverse cycle of your air conditioner. The don't blow warm heat like a gas furnace does. When the temperature reaches a preset limit, heating fins kick on and you finally get warm air. For me, I'd much rather have the soothing warm air put out by a gas furnace.