I've got a very expensive professional conversion to R134A, as evidenced by the previous owner's receipts from the most expensive Mercedes dealer near DC. It cools adequately around here whether running along or standing still in traffic.
Last year DC had 16 days of summer weather exceeding 90 degrees. So far this year we've had 48, and its not over yet.
The R134A conversion, perfectly done, is not quite as cold as R-12. We had one day that was really really hot (100 officially) and I switched to internal air recirculation rather than taking in outside air in order to stay cool.
Considering my local climate, if the R-134A system fails somehow, I still won't go back to R-12.
Any evidence that the hole in the ozone is getting any SMALLER from all this effort to eliminate R-12?