How do you put refrigerant in an AC system?

To put refrigerant in an AC system, you need to first locate the service valves on the unit. Then, connect a refrigerant charging hose to the low-pressure service valve. Open the valve on the refrigerant canister and slowly release the refrigerant into the system. Monitor the pressure gauges to ensure the correct amount of refrigerant is added. Close the valve and disconnect the hose once the system is properly charged.