Older refridgerators have the bad stuff in them, so its really up to you what you do with them...They usually have aluminum cooling units behind the wall of the freezer compartment and the copper pipeing that runs thru the walls is usually caped with insulation that is a scrap metalscrap metalscrap metalscrap metalscrap metal to get off...Read up on the freon before you decide to release it into the air, just my thought!!!