Why i rate 5 stars is due to the fact the ac is quiet. It cools down my apartment the is 50ft by 18 ft in 2hrs and the its wifi. Now for those who might have trouble with wifi. At some point you might need to reconnect the ac as a new unit. What happen to me was the app didnt want to work. I call costumer service and they said it was app issue but I resolve it by reset installing the unit on the app. Costumer service agents are friendly. So far A+ worth the money invested.