Loud banging, rattling, or screeching noises often signal worn or failing furnace components.

A yellow pilot light, frequent cycling, or trouble starting can indicate unsafe or inefficient operation.

Uneven heating, with some rooms staying cold, may mean your furnace can no longer keep up with your home's demands.

Burning odors, rust, or visible corrosion are warning signs that it may be time for a professional furnace replacement.