Wood stove and heat pump combo
I have a wood stove in the lower floor of my house. I cut a vent size opening and installed a temperature activated fan that blew the heat into the intake duct. I started out with just the opening but found the fan made a big difference. When I ran my stove I turned the furnace fan on and the wood stove kept the house warm. On really cold days or if I was too lazy to start a fire the furnace took over. I did add smoke detectors in each bedroom just in case smoke got into the intake, that never happened and it cut my heating bill over 250/month.