Does anyone have any idea what this strange noise is in the linked video?

It happens after the heater has been on for a while, and it always seems to happen twice (a few seconds apart).


  • Go ahead and up vote your answer so it gets closed out in the system. Having an answer may help others with the same noise. – Ed Beal Nov 15 '18 at 21:58

The HVAC technician I had contacted just got back to me right after I posted this. He says the noise is the compressor going into defrost mode, and it is an expected sound for the quality (builder-grade) of the unit I have.

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