I could very easily have misunderstood the very limited description of the setting. I thought it was for adjusting the performance of the climate control. Perhaps it is just for adjusting the external ambient temperature display. Yeah...I just went out and experimented. It's an adjustment for the external temperature display.I thought you could only adjust the outside temp display??? Maybe I m wrong... but + would answer your question.
BTW...you have to leave DC mode before the temperature adjustment is applied to the display.