This is a fan that moves air through the duct system in your home.

A valve that controls the flow (pressure) of gas to the furnace burners.

The heat exchanger in your furnace separates the flue gases (such as CO) from your household indoor air.

A small motor located inside the front of your furnace. It pulls the flue gases from the burners and through the heat exchanger.

The circuit board controls the sequence of operations and modern boards provide notification of potential problems via LED lights.

A safety device that prevents the furnace from operating if unsafe conditions occur (e.g. blockage due to lack of maintenance).

The flame sensor is a safety device inside the furnace that detects the heat and communicates to the circuit board to allow the burner(s) to stay lit.

In the absence of a conveniently located drain, a condensate pump is used to move condensate to a plumbing drain.

A plate or gate placed in a duct to control air flow.

A chemical used in the air conditioning process. Freon or R-22 has been phased out and has been replaced by Puron or R-410A, a more environmentally friendly refrigerant.