Question: What does the function of QUIET button on remote controller?

The TURBO function is used for fast heating or cooling.Press the TURBO/QUIET button once and the remote control will display the TURBO icon on the bottom right side of the remote display and switch the unit to the TURBO
function.
The QUIET function may be used when silence is needed for fast rest or reading. Press the TURBO/QUIET button again to switch to QUIET mode and the remote control will display the QUIET icon on the bottom left side of the remote display.
Press the TURBO/QUIET button a third time to cancel TURBO/QUIET and return to normal operation.
Note:
TURBO/QUIET modes are only available when the unit is under  cooling or heating mode (not for auto or fan mode).
Running the unit in QUIET mode for a long period of time may cause the room temperature to not reach the set
temperature. If this occurs, cancel QUIET mode and set the fan speed to a higher setting.