A repair shop that does A/C work, They reclaim the refrigerant, recycle it, and can reuse it, that is, if your car actually has (FREON, that's R-12 in a car.)

Proper handling should be done only by trained persons.

SEE ALSO, THE QUESTION : can I use a vacuum pump to remove Freon from my car.? in cars and transportation.

Legalities and safety rules for handling are explained.

Since you stated it is freon and not R134a, most shops would do it for free. They will just reuse it when a pre1994 vehicle needs to be recharged.

Since a qualified person would not ask this, I will simply say: You legally cannot do it. Take it to a shop.

You take it to a LICENSED garage for A/C