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lynx-
Yep, AC is intended as a sealed system, no refrigerant should escape and it isn't 'used up.
There will likely be a leak somewhere, and it's technically illegal for anyone to knowingly re-gas a known leaky system. Get it UV tested, you'll likely need to replace the condenser as it's a labyrinth of tiny, fragile aluminium channels.
ectoplasmosis
Could be that it's blowing air, but not very cold.