Do you charge ac on low pressure side?

No, you do not charge AC on the low-pressure side *exclusively*. While refrigerant *enters* the compressor on the low-pressure side, charging the system solely through this port is inefficient and inaccurate. The proper way is to charge the system using a set of gauges that monitor both high and low-pressure sides, ensuring the system is properly charged to the manufacturer's specifications. Charging solely on the low-pressure side risks overcharging the system, which can lead to serious damage.