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Thanks for the ideas. I'll do more tests but I believe yesterday I heard no unusual sound at any location except for the middle right of the indoor unit. I believe I checked the outdoor unit and compressor area on the bottom right, plus the linesets but the sound only existed at the indoor unit...

I like to stay slightly under rather than risk over charge. Under you lose the smallest bit of efficiency. Over you risk damaging the compressor. But yeah, 23 vs. 21 isn't the issue. That's pennies. Thanks for thinking about it. Strangest thing I've ever heard. It's a 9k. Cheers.

I'm the installer. Never had this happen before. In heating mode it eventually begins making a muted version of this sound and unlike in cooling mode it doesn't go away after 1 minute.

Of course. 21 grams added.

No, it's 30 feet.

Well here's an odd one. Brand new install, quality equipment, Carrier 40MPHA indoor paired with 38MPRA outdoor. Everything works as usual, but each time the compressor cycles on, as the indoor unit begins cooling, it goes through a 1 minute ringing / singing / resonating sound that increases in...