Here are some common noises that furnaces can make:
Whistling: This occurs when you have a ductwork hole or a dirty air filter.
Rattling: Rattling happens when components in the system are loose.
Loud noises: Worn-out bearings can cause loud squeals and similar noises.
Banging: If the furnace is making loud banging noises when you turn it on, you may have a problem called oil-canning or ignition rollout.