From geothermal advances to stoves to good old-fashioned ceiling fans, we're deconstructing the latest technologies for efficiently and effectively heating and cooling your home. We dig deep to see how geothermal technology uses the power of the earth to save you money on your energy bill. Plus, how does a stove compare to a fireplace? See how a little recycled wood can turn a stove into a clean, mean, burning machine. Then, we're pushing ceiling fans to the ultimate limit. Do they really lower room temperature? We'll find out!