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If you were totally empty and the PO said they topped it off each year, your leaks should be visible. There will be refrigerant oil residue around the area that is leaking. Make sure you snug down all the caps on the outdoor unit (once you've finally bought that service valve cap).
You'll be able to tell how the unit is running just by a simple visual inspection once in a while. You should notice "sweat" on the suction line and the suction line service valve. Another thing you can do is watch the evaporator drain and see how much water it's putting out. If you notice a drop in the amount of condensation out the drain, go out and look at your suction line and see if it's sweating. If not, you're low on refrigerant. One caveat though, it can go the other way when overcharged too and you won't see any sweat. When it's close you'll see sweat on the line.
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Nick
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