What is the difference between a single-stage, two-stage, and modulating furnace?
When we size a system, we size it for the coldest days in Montana. A single-stage furnace is going to run at full capacity whether it’s -40° or +40° outside. In other words, it’s heating at 100% capacity every time it gets a demand for heat from the thermostat. A two-stage furnace is more efficient because it will begin heating at a reduced capacity of 70% which is a sufficient amount of heat on milder winter days. When the temperature drops and your home finally needs that extra 30% the furnace steps it up to the second stage at full capacity and heats your home on those frigid cold days in Montana. That saves you money and adds comfort because your furnace is using less fuel most of the time in the first stage and heating more evenly because the temperature rise is not as drastic as a single stage furnace. This is where the competition ends and Rheem takes it to a whole new level. A Rheem® modulating furnace has the ability to make the energy efficient fan and the burners modulate do
