Why not look into a geothermal heat pump setup? From the research I've done, they are much more efficient and provide significant savings on the cooling side as well. Plus, I'm not sure if this is the case everywhere but in Michigan, our electric utility will set up a separate electric meter for your geothermal heat pump and sell you electricity at half the going rate to power it and your hot water heater too.. assuming it's electric as well. Combined, that makes it a real bargain.... with the exception of the crazy high installation price.
That's the direction I'm headed once I get my coal stoves installed. In the end, I'll have a 3 ton geothermal heat pump plus two coal stoker stoves. The backup for the heat pump will be a forced air LP system that I intend to never run.. except for the fan to move the air. It may seem like overkill but I'm certain that without the coal stoves, the heat pump alone wouldn't keep my home toasty warm on really cold days without the LP kicking in and after this last winter in this old farm house as the Polar Vortex descended and my old LP furnace began dying... like Scarlet O'Hara I proclaimed... "I'm going to live through this and when it's all over, I'll never be chilly again. No, nor any of my folk. If I have to lie, steal, cheat or kill. As God is my witness, I'll never be chilly again."
PS: There are some pretty awesome tax credits and generous financing programs around for geothermal heat pumps too... which is another advantage.