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I don't know but my outside unit has been making a relatively loud continuous buzz when it is running. This has been the case for at least a couple months (that I have noticed) but the unit seems to otherwise be functioning fine (house still cools down well enough). My concern is that it could be an indication of a problem that should be tended to before a breakdown or other damage occurs.

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11y ago
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Q: Is it normal for a central air conditioner outside unit to make a continuous buzzing noise?
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