ac retrofit on 1990 Oldsmobile 88

my car has the old freon and i am told i need to retrofit the ac unit for the new freon. What is the cost of doing this and can i find someone to recharge with the old style freon. The ac blows air at a temp of 64 degrees. I live in phoenix az so the ac is a necessity.

Asked by for the 1990 Oldsmobile 88
depends on the service facility. there are some that still do r 12 charging but it is not cost effective.
retrofitting runs around 300-500 depending on parts needed.