 Here's songwriter Roberts. It's not that I think this song alone is going to make people run out and replace their gas furnace with a heat pump, but I'm hoping this is just going to create a good feeling. Heat pumps can be expensive, up to $20,000, depending on where you live. You can drop that price through federal rebates, and more incentives are expected to roll out at the state level in the next few years. But if you replace both an air conditioner and a furnace, you'll save.