Modulating Furnace Most furnaces are either “off”, providing no heat, or “on” at full capacity, with the burner and blower operating at 100 percent. This causes the temperature in your house to go up and down by several degrees – affecting both your comfort and your energy bills. Furnaces are designed to keep your home warm on the coldest of days. But in most cases, those days account for only 2-1/2 percent of the heating season. The rest of the time, your furnace is providing more heat than is needed to satisfy your comfort requirements. Modulating furnaces solve this problem by “”modulating”” between different capacities (40-100%), depending on the comfort requirements of the homeowner and the temperature outside. This results in lower operating costs, quieter operation and much more even temperatures throughout the home. It`s like having a separate furnace to handle the unique heating requirements of each day – all in one unit! Two-stage Furnace”

A two-stage furnace has the same concept in mind as a modulating furnace. The difference lies in the fact that while a modulating furnace can operate at any capacity between 40% and 100%, a two-stage furnace operates on a low-stage and a high-stage. The low and high stages have preset BTU outputs. On most days, the furnace will operate at its first stage to only provide the heat you need to stay comfortable. On those very coldest days of the year, this furnace will ramp up to its second stage and give the full BTU output of the furnace to keep satisfying the heating requirements of the home. It`s basically like having two furnaces in one – one for the warmer days and one for the very coldest.”