Home coffee roasters come in three different categories: Stove-top, air-bed, and drum. 1) Stove-top, as the name suggests, go on your stove and you stir the beans with a crank. 2) Air bed roasters blow super hot air into a chamber and roast or cool the beans based on a timer. 3) Drum roasters are typically a bit pricier, but are the closest you will come to a pro-roaster on such a small scale.