What Is a Two-Stage Furnace? A two-stage furnace can operate at two levels of heat output. Unlike a single-stage furnace, which is either on or off, it runs on low or high fire. For most homes, the low stage delivers steady, comfortable heat and can help lower utility bills. How Does a Two-Stage Furnace Work? A single-stage furnace has a… Read more The post Two-Stage Furnaces – How Furnaces Work appeared first on Modernize.
