Two-stage furnaces provide two different heating levels to keep a home comfortable regardless of its heating needs. On days when outside temperatures are moderate, the furnace operates at a lower level to provide efficient heating. This lower level also reduces the temperature differences residents experience with a traditional furnace. On colder days, the unit operates at the second level, providing the needed additional heat.Know More
The lower heating level is sufficient in homes 80 percent of the time. However, on the coldest days of winter, it is unable to provide the heat to counteract the cold, so dual-stage furnaces use the second stage. When installing a single-stage furnace, HVAC professionals choose a unit operating at the second level all the time to ensure year-round comfort.
The dual-stage unit begins at its first stage, when the heat requirement is low. This eliminates the need to reach capacity immediately. The result is quieter operation without a sudden blast of air.
Low-speed operation improves filtration of the air in the home. The daily air exchange volume is increased. Home occupants find it easier to breathe with contaminates trapped by the filter.
Operating in the reduced level requires less fuel than standard furnaces. Ducts remain warm, reducing heat loss. In addition to the money saved, this reduces pollution.Learn more about Heating & Cooling
A two stage gas furnace differs from a one-stage unit with its capability to operate a high or low stages of heating. The result is that the system saves energy by using less fuel during the low stage of heating.Full Answer >
The disadvantages of two-stage gas furnaces are that they may not work well in large homes and that they have a higher initial cost than single-stage furnaces. As of 2015, two-stage gas furnaces cost about $500 more than equivalent single-stage models.Full Answer >
A single-stage Westinghouse gas furnace operates at the same capacity whether it's an extremely cold winter day or on the mild side, while a two-stage furnace operates at a lower capacity on milder days without sacrificing comfort. The two-stage furnace is usually more energy efficient.Full Answer >
A two-stage heat pump has a compressor which is capable of operating at a high and low speed, improving its ability to maintain the temperature in a home with greater precision. This type of HVAC system also offers the advantage of more economical heating and cooling.Full Answer >