Which of the following is not a component of a forced warm-air furnace?

A forced warm-air furnace typically consists of several key components designed to heat and distribute air throughout a building. Among these components, the blower or fan is essential for moving the heated air from the furnace into the ductwork, allowing warmth to be circulated effectively throughout the space. The heat exchanger is crucial as it is the part where heat is transferred from the combustion process (or electric elements) to the air that will be circulated.

The inclusion of a compressor is characteristic of refrigeration or air conditioning systems, as it is responsible for the circulation of refrigerant in those applications, rather than the heating function of a furnace.

A dehumidifier, while it can play a role in the overall indoor air quality system, is not an inherent component of a forced warm-air furnace itself. It serves a different purpose, primarily focusing on reducing humidity levels in the air, which does not directly relate to the fundamental operation or components of the furnace system used for heating. Thus, the correct answer identifies the dehumidifier as not being a core part of a forced warm-air furnace.