I m using this for last 4 years. And it colling has never changed it works at anywhere. Atany temprreature and the feature of the ac is that its powerfull mode when u felling to much heat then u can use that and within 5 min it starts colling if u sleepthen u sonthave to care about the mode it autometically off in 30 min evreone always apprecite for the colling of my ac.