I'm guessing you have an older HVAC system. Huge advances in air source heat pump efficiency came in the last decade. If you own the place and plan to stay ther

I'm guessing you have an older HVAC system. Huge advances in air source heat pump efficiency came in the last decade. If you own the place and plan to stay there more than ~5 years I would look into it. Could save you a lot over time depending on local climate. Gas heat is cheaper than ever. But as long as you're not in an extremely cold area heat pump is probably cheaper. In your case, it might make sense to keep the furnace for days too cold for the heat pump to work efficiently. Use it as supplemental heat. In days when temperatures are >40F the heat pump would be ~6X more efficient at moving BTU than gas heat. You can use online calculator to work out the BTU of gas used vs electricity cost. There's definitely a lower temp limit where gas is cheaper, but also a good chance your climate doesn't hit that temp often