Why is my air conditioner making a humming noise?

Published on May 31, 2019

If your air conditioner is humming, it could be a sign of an electrical or mechanical problem. Take steps now to determine the issue with your air conditioner.


Probable causes of your cooling system’s hum could include:

  • The condenser fan motor on the unit could be unable to spin but still have power reaching it, generating resistance that produces a pronounced, and often loud, humming sound.
  • There could be a mechanical or electrical malfunction with the contactor relay switch, which is responsible for powering on the outside unit when the indoor temperature rises to the level where cooling is needed. When the contractor fails, it can produce a humming sound.
A humming sound is a signal that something inside your air conditioner is off and needs consideration. Contact the experts to inspect your system and diagnose the problem.
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