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What are the Parts of Your Furnace?

The furnace in your San Antonio home doesn’t have a lot of moving parts, but it’s a complex machine nonetheless. Understanding how your furnace works can help you troubleshoot problems as well as communicate more effectively with a technician in the event something goes wrong.

The Thermostat

When the temperature in your home dips below the thermostat setting, the thermostat sends a signal to the furnace, and a valve opens to allow gas to enter the system. The pilot light ignites the gas inside a combustion chamber.

The Blower

The blower inside the system turns on and brings cool air in from the cold air return, which is a duct that’s fed by the cold air return registers in your rooms.

The Air Filter

As the air is blown into the unit, it passes through the air filter, which removes dust and allergens to protect the system and improve indoor air quality.

The Heat Exchanger

The heat exchanger is a metal chamber that gets hot and warms the cool air as it moves past.

The Hot Air Plenum

The plenum is the large metal box at the top of the unit that holds the warmed air coming from the heat exchanger. The blower blows the air from the plenum into the ductwork, which delivers the warm air to your rooms through the registers.

The Flue

The flue is the pipe that sends combustion gases out of your home and into the outdoor air through the roof or wall.

A Tuneup Keeps Your Furnace Operating Properly

A professional tuneup in the fall will go a long way toward keeping your heating system operating safely and efficiently, and it helps prevent common operating problems during the heating season. A tuneup includes a number of essential tasks, including:

  • Tightening gas and electrical connections.
  • Inspecting for carbon monoxide leaks.
  • Inspecting belts and bearings.
  • Lubricating moving parts to reduce friction.
  • Inspecting ducts for damage.
  • Testing the thermostat for accuracy.

For more information on how your furnace works, or to schedule a preventive tuneup, please contact us at Beyer Boys, proudly serving the San Antonio area.

Our goal is to help educate our customers in the greater San Antonio, Texas area about energy and home comfort issues (specific to HVAC systems).

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