air conditioner dryer???
any time open to the air? Roughly squat.
I wouldn't buy one that wasn't still sealed.
Its job is to remove a little bit of
moisture from the A/C regrigerant stream.
It'll do the same thing sitting around,
from the ambient air, and you can't tell
just how much of its life is left. So the
only right answer is "brand new, 100%".

