I had a new Lennox split system installed (G60V furnace and HS 26 Condenser. When the installers charged the system, I did not notice them evacuate the system prior to charging. Is this normal practice?

Also I feellike I have buyers remorse, I maybe should have gone with a condenser that uses r410a? Should I have them change it out with HSX 15 and new coil? You see the option was not given to me initially, not til I found this site was I aware that there existed r22 and r410.