I'm also a Yukon-Klondike user, although wood-only. My furnace is 30 years old, and this will be its final winter, as it's in need of major repairs. You can't expect much more from a wood furnace! I want something I can load up for the day and have the fire burning when I return home at night, as well as cut the amount of work and the mess that comes with burning wood. I'd also like to be able to use it earlier in the fall, to further cut my oil usage. I'm seriously considering a Keystoker hot air furnace. This in no way is a bad rap on my Yukon though. It has given us 30-winters of mainly trouble-free heat, and saved many, many $$$ that would otherwise have been spent on oil, and we've been a lot warmer than we would have been otherwise. The only parts I've ever needed were a couple grate sections over the years, and replacement fire bricks. My experience with Yukon's customer service has been top-notch. If you don't mind the work of burning wood and are thinking about a furnace, definitely give it some consideration. I've never tried burning coal in it, so can't help from personal experience, but I can say that I can only use this furnace when it's no warmer than 20, as the heat drives us out if it's any warmer, and since the fire's just smoldering away, the chimney fills with creosote. I'd imagine with a hotter coal fire, we'd have had similar problems with milder weather, minus the creosote.