Thank you for your question.
I can understand wanting to salvage the copper in the air-conditioning unit.
Before you start the a/c system need to be empty of any refrigerant.
If the system still has refrigerant in it you will have to have the systems refrigerant recovered. It is illegal to release the refrigerant into the atmosphere.
If the system is already empty of refrigerant then you can remove the outside panels on the condensing unit and or bring the unit as a whole to the salvage yard as most of them will take the condensers and the evaporator coils complete.
Going through the process of removing all the copper from the aluminum is not very cost effective. Let the salvage yard do it.
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