Ryhthmic hum normal for an AC unit

Old 08-15-19, 04:56 PM
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Question Ryhthmic hum normal for an AC unit


My home AC unit is about 18 years old. I've had the evaporator coils serviced/cleaned when I replaced my furnace 4 years ago and my new unit has a sealed return system so my coils should stay much cleaner.

I've also cleaned the condenser unit and coils, as you will see in the video it is clean. My house keeps cool and it doesn't run continuously on hotter days--as some likely do.

I simply want to ensure the noise it makes isn't a sign it is about to give up the ghost.

I've found the rattle, as you will see when I silence the side guard. However, is the hum sound that is rather pulsating or rhythmic normal for the compressor?

Here is a link to my short YouTube of its sound as I find the rattle maker.



Old 08-15-19, 05:00 PM
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Not a rhythmic hum..... a resonant hum and is very common.
The other sound..... the rattle.... was the case vibrating. That could be a loose screw.

An A/C system should be sized so that it runs almost continuous on the hottest days. This type of operation will remove the most moisture from the air.
MRTkH voted this post useful.

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