Description Forced air heating is the most common method of heating homes. Natural gas, heating oil, and electrical furnaces send heat through air ducts and distribute out throughout the home. Today’s high efficiency models can reach annual fuel utilization efficiency (AFUE) ratings up to 98.5%. That means just 1.5% of the energy is lost. Learn more about the different types of furnaces. Visit https://www.icsny.com/blog/which-is-the-better-choice-for-your-home-radiant-heat-vs-forced-air