Air Conditioner makes Loud Hum when starts then goes away

Suggest let him pay to inspect and fix it, if its indeed broken........

I'm not sure what you mean. Drowns out what? AFAIK, "drowns out" must be followed by another noise. The first noise is louder than the second and drowns the second noise out so that the second noise can't be heard.

Maybe you mean it fades out?

Meirman

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It happened to me when the idiot A/C guy over charged the system. Get a pro to check it out. IF that is the case, eventually the compressor will die causing a much bigger repair bill. As far as I could tell the idiot did not compensate for ambient temperature when he filled the system during the last service call (it was a cold day).

The First loud hum fades out to a low hum.

Thanks, I will have an AC guy check it out.

One other thing to check is the wiring. Is the gauge heavy enough for the starting load? I used to work at a place where the actual wiring in the walls would hum when the AC started. You could hear it throughout the whole building. There was a repair guy there one day and I asked him about that. As soon as he heard it, he said the wiring is too small for the load. He checked, and it was too small. His method of explaining the hum was because the wires were in steel conduit and the load actually made the wires heat and vibrate in the pipe. The sound was eerie. They rewired it a few days later and I never heard that again.

And if the wires are too small you have a safety issue.