AC fan motor noise.
 

the cooling fan on my AC is unusually noisy. sounds like a turbo or, for the IT guys out there, the sound of a server room (hundreds of fans going). is this typical or bad? it doesn't sound like bad bearing or a fan about to go out. just like a very loud fan. when I turn the car off in my garage, is almost sound like a jet engine shutting down.
If it is not a bad thing, I don't mind it that much. actually sounds pretty cool.