You will not be happy with the performance of R134a in Deltona, Florida. And there's no reason you can't buy R12 and put it in yourself. For $15 you can take the online, open book test at
imaca.org. Then you can go down to Advance/Discount auto parts with your certificate and buy R12. I bought 4 cans a couple months ago for $18.00 a can. Since then I've been told the price has gone down further, to something like $15. So there's no need to even bother with conversion.