Side note: common air duster can be used as refrigerant in old R12 systems used in cars until the early 1990s. there's a cheap "clamp" available online that pun

Side note: common air duster can be used as refrigerant in old R12 systems used in cars until the early 1990s. there's a cheap "clamp" available online that punctures the duster can to tap it for the refrigerant. As far as i know, no modifications are needed to the old R12 system besides vacuuming out which any professional air conditioning technician can do.