.9 lbs of freon
It does not contain R-12 Freon. It contains R-134a. How much depends on what is in there now. Take it to a professional shop for charging, as there is more to it than just adding refrigrant.
1.75 lbs
44 oz or 3 freon cans
It does not take Freon. It uses R134a refrigerant.
1.9 lbs
1.675 pounds.
You can get a can at an auto port for $20.
You recover the refrigerant with an AC recovery/recycle machine.
1.875 lbs
28 oz total
28oz if completely empty