A two-stage furnace offers you  consistent comfort, quiet operation, improved air filtration, and savings on your utility bill. When you hear someone refer to a furnace as being a single-stage or two-stage furnace, they are talking about the burner section of the furnace. A single-stage furnace has two settings: either on or off. A two-stage furnace has three settings: high, low, or off. On a milder day, a two-stage furnace will operate at the low setting, which uses 65% of Read More...