Common methods for verifying refrigerant charge levels during commissioning include pressure testing, temperature measurement, and flow rate measurement. Pressure testing involves measuring the pressure of the refrigerant in the system to ensure it is within the manufacturer’s specifications. Temperature measurement involves measuring the temperature of the refrigerant at various points in the system to ensure it is within the desired range. Flow rate measurement involves measuring the flow rate of the refrigerant to ensure it is sufficient to meet the system’s cooling or heating load.