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Thanks. since I have two db levels of hum I would say one is abnormal. I am assuming you are saying these can go a long time with a loud hum and still work. Still it is annoying to hear it through the floor in the basement late at night And why does flipping the power on and off...

My name is Mark from NJ and I am a DYIer. I just posted a question in the HVAC section had hope to find help from those who know.

I have an older furnance with a Honeywell RA 89a 1074 switching transformer that has a loud hum at times at other times a low hum When I hear the loud hum the system still works and if I turn off the power switch and turn it back on , the hum changes most the time. It will usually get...