Buzzing furnace sound
 

American Standard Furnace Is always buzzing. Everything is working, just annoying sound. No clue how to stop it. Is it normal? I would love to hear possible solutions

On the chance that it is a loose lamination, find one of these


in your furnace and press on it.

Relays can also buzz but pressing on them is a bit tricky.

With a helper you can also use an empty garden hose as a stethoscope but the metal panels in furnaces can act as diaphragms and so you might do better pressing on things.

The buzz frequency may give a clue; YouTube has various sounds of various frequencies that you can use to compare.