Location: Atlanta, Ga.
Unit: Fedders Heat Pump
Age of unit: 3 months
Installer: Really good guy
Unit: Is heating a-okay. Outside unit runs as expected.

Recently we have been hearing a really strange noise in the wall where the HVAC line sets are located. It is weird. My wife describes it as follows:

sounds like a door opening.
Then it sounds like water dripping!!
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I have heard it also. The water dripping noise is weird.
((Not water though. No water pipes in wall and no water in basement.

I do know that in summer (the old unit) I could hear noise in the wall which sounded like refrigant. Always did it until removed.

Sorry for the dumb question. Is it possible the installer
did not pull a decent vaccuum?

Are we losing our cookies as they say?