The condenser on my AC unit started humming recently, even when the unit is not running. I tried pulling the fuses but the hum continued. Everything seems to be working OK, cycles on and off and cools normally. Is this something to worry about? What could I check myself.

Hi what type of unit you have

It is probably your contactor making the noise. Cheep fix, you can get one for around $20

Sorry , about the humming noise fixt it was the fan blade too low thank you guys for anwering to my question everything has a reason .