Thermostat: The thermostat is the control center for your furnace. It monitors the temperature inside your home and sends a signal to the furnace when heating is needed. When the temperature drops below the thermostat's setting, it activates the furnace.

Oil Tank: The oil tank stores the fuel (heating oil) that the furnace burns to generate heat. This tank is typically located outside the home or in the basement.

Fuel Pump: The fuel pump draws oil from the oil tank and sends it to the burner at the correct pressure. It's a crucial component, as it ensures a steady flow of oil to keep the furnace running smoothly.

Burner: The burner mixes oil with air to create a fine mist, which is then ignited to produce a controlled flame. This flame generates the heat needed to warm the air in your home.

Combustion Chamber: The combustion chamber houses the burner flame. This is where the heat is generated as the oil burns, and it's designed to withstand high temperatures.

Heat Exchanger: The heat exchanger transfers the heat generated in the combustion chamber to the air that circulates through your home. As the burner produces heat, the heat exchanger warms up, and air passing over it absorbs this heat.

Blower: The blower is a fan that pushes the heated air from the furnace into the ductwork, which distributes the warm air throughout your . It ensures that the heat generated by the furnace reaches every room.

Flue/Chimney: The flue or chimney is responsible for safely venting combustion gases, such as carbon dioxide and water vapor, out of the house. Proper venting is critical for maintaining safety and air quality indoors.

Limit Switch: The limit switch is a safety device that shuts off the burner if the furnace overheats. It prevents the furnace from reaching dangerous temperatures and causing damage or fire.