New clean-burn E.P.A free standing wood stoves are an efficient way to heat a specific area of a house and a great way to use renewable energy About 10 million woodstoves are in use in the US today but 70 to 80 percent of these stoves are older, inefficient, stoves that create significant air pollution. Newer stoves certified by the US Environmental Protection Agency (EPA) produce nearly 70 percent less pollution than older non-certified models. Be sure the stove you choose is on the List of EPA Certified Wood Stoves. About 10 million woodstoves are in use in the US today: 70 to 80 percent of these stoves are older, inefficient, stoves that create significant air pollution. Newer stoves certified by the US Environmental Protection Agency (EPA) produce nearly 70 percent less pollution than older non-certified models.[3] Be sure the stove you choose is on the List of EPA Certified Wood Stoves