No, a properly installed HVAC system should not need additional refrigerant (R-22, 410A, etc.) as part of maintenance.  HVAC refrigerant gases are harmful to the environment. HVAC systems are not designed to leak or need additional refrigerant. If your HVAC system is low on refrigerant there is a leak. Adding refrigerant to a system without repairing the leak is a temporary fix and is bad for the environment and your wallet.  If your system is low on refrigerant, have a certified HVAC professional diagnose and repair the leak, before adding additional refrigerant.