Cal,

Unless your system has a problem of some sort or just won't keep you cool at all, I would not do the reverse conversion. Once the system has to be opened and repaired for some reason, then it would be a good step.

There are some states that have some crazy laws about a/c service, but I would expect that the Florida congress would have enough experience sweating that they wouldn't get too crazy about it. If that's the case, I believe that a shop could legally reverse convert an original R12 vehicle. The only thing that may come into it from a legality stand point is that they must RECOVER the existing refrigerant. That goes for either 12 or 134.

To do the conversion on a working system would require breaking of all connections, flushing all these broken apart components, flushing the compressor and replacing the r/d. It would be probably a half days work if nothing else went wrong.