HVACR technicians who learn how to use both subjective and physical information when troubleshooting a “noisy motor” will be able to get to the heart of the problem more quickly.
On the subjective side, the challenge for anyone dealing with the problem of noise is that tolerance of noise varies (often substantially) from person to person. This explains (at least in part) how teenagers can tolerate music at ear-splitting decibel ranges while their parents cannot.