Why does a Bryant furnace make a noise?

A Bryant furnace, such as its two-stage model, can create noise during its various stages of operations, as well as due to issues that require maintenance or repair. When a Bryant furnace is first started up, popping and rattling sounds can be heard as the metal inside begins to expand.

Rattling sounds emanating from a Bryant furnace can also indicate that the heat exchanger inside is cracked, which can cause it to leak dangerous levels of carbon monoxide. If a hum is heard from a Bryant furnace, it is generally coming from the motor, indicating that it is close to failing due to either a lack of maintenance or age.