Two-stage furnaces have two different heating settings, allowing them to operate at a lower, more energy-efficient setting for most of the time, and switch to a higher setting when additional heating is needed.

Carrier's high-efficiency two-stage furnaces are designed to operate at up to 96.7% AFUE, which means that they can convert up to 96.7% of the fuel they consume into heat for your home. They also use advanced technology, such as variable-speed blowers and modulating gas valves, to help optimize heating performance and minimize energy usage.

In addition, Carrier's two-stage furnaces are known for their quiet operation, and many models feature insulation and other design features to help reduce noise levels. They also offer a range of options and features, such as programmable thermostats, air purification systems, and humidity control, to help customize the heating experience to each individual's needs.