Replace evaporator coils when replacing R22 condenser with a 410a unit?
I agree replacing everything will save in the long run. Flushing the system rarely gets everything and residue in the system can shorten the new system life. When the company recoveres the R22 out of the system being removed from service that same R22 can be used to top your other R22 system legally. Other than that it is supposed to be sent back to a recycler.