So, I would be that "pointer-outer". Sorry BobsAClass and D&MAKAFUN!
Once we started running just our A/C fan at night to move air around, the hum was no longer noticeable to us.
BTW, we set the A/C in the front to a comfortable level and it goes on and off all night, as necessary, blowing cold air into the bedroom too. The constant on and off of the A/C in the bedroom was bothersome and would wake me up.
This strategy kills two birds.....