If you switch off the AC using the remote control but not from the mains (i.e., not unplugging it or turning off the power supply from the wall socket), the AC unit will still consume a small amount of electricity in standby mode.
Most modern AC units have a standby mode that keeps some components active to respond to remote signals and be ready to turn on quickly when you use the remote again. Additionally, some AC units might have display panels or indicators that remain illuminated when in standby mode, which also consumes a small amount of power.
While the power consumption in standby mode is relatively low compared to when the AC is actively cooling or heating, it can add up over time if the unit remains in standby mode for extended periods.
If you want to completely avoid any electricity usage when the AC is not in use, it's recommended to switch it off from the mains (unplug it or use a wall socket switch if available). This way, you can ensure that no electricity is being drawn by the AC when it's not needed.