Q:

How does a two-stage furnace work?

A:

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.

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.


Is this answer helpful?

Similar Questions

  • Q:

    How does a gas furnace thermocouple work?

    A:

    According to HowStuffWorks, the thermocouple in a gas furnace uses two dissimilar metals that produce an electric current when heated in order to power an electromagnet that opens a valve allowing gas to reach the furnace. If the pilot light goes out, the thermocouple cools and no longer produces the current, so the electromagnet releases the valve to stop the gas flow.

    Full Answer >
    Filed Under:
  • Q:

    How does a high-efficiency furnace work?

    A:

    According to Energy.gov, a high-efficiency furnace works by condensing gas in another heat exchanger, yielding a more efficient system. A furnace with high efficiency also has sealed combustion for better performance, and a system of this quality has a range of 90 to 98.5 percent Annual Fuel Utilization Efficiency (AFUE).

    Full Answer >
    Filed Under:
  • Q:

    How does a gas furnace work?

    A:

    A gas furnace consists of two parts, an outdoor air conditioning unit and indoor furnace that work together to draw in, heat and circulate winter air and cool, then circulate, warm summer air. These two units contain components including a burn, flue and heat exchanger that contribute to making the process complete.

    Full Answer >
    Filed Under:
  • Q:

    What is a two-stage heat pump system?

    A:

    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 >
    Filed Under:

Explore