Which systems are more reliable, those that use R22 vs. R410a? Are R410a
systems REALLY as reliable R22?

I live in a condo and replacing the refrigerant lineset would involve
ripping up the ceiling drywall. My AC system is 20 years old. Wondering
the best solution would be to get a new R22 system (with existing
refrigerant lines) installed before 2010. If the existing system were to
die after 2010, then only systems that use 410a will be sold, and I would
have to hope and pray that cleaning/purging out the old lines REALLY is
going to be sufficient for a reliable 410a system. What do you think?

Thanks,

J.