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Without being there to actually hear it or investigate, it could be a number of things causing the noise.
It's possible it's the compressor, but hopefully not. That would be the most expensive item to replace. Unless it's still under warranty, it would probably cost you over $1,000 to replace.
Outdoor fan motor could have bad bearings (it doesn't have a belt). While it could be a little expensive, not nearly as bad a compressor. (maybe a couple hundred to replace)
Outdoor fan blade could be hitting something. Unless the blade is damaged, this is a quick and cheap fix.
While also possible but not as likely..
Compressor or fan contactor could be making noise. Sometimes they will make a "chattering" noise that can be very loud.
Reversing valve can be noisy, but very unlikely it would be that bad.
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