It's not getting any cheaper to heat your house with gas or oil. But pellets—well, that's another story. Clean-burning pellet stoves can drastically cut your home heating costs. They look like wood-burning stoves but are fueled by small pellets made from superconcentrated sawdust. Pour them into the stove's hopper, and they're fed automatically into a burn chamber; a fan blows the hot air into your house. There are freestanding models as well as fireplace inserts, which vent through a stainless-steel lining that runs up your chimney.
Read on about the appeal of pellet stoves.