The three functions of heating, cooling and purifying work brilliantly. The app is super great too and I love being able to control all of the setting from my bed via my phone. The other fab feature is the magnetic remote that sticks to the curved top of the machine. I really love this machine and I am sleeping so much better at night now I have it. My only criticism is that it should be taller so that you can be in bed with it placed on the floor and the cool air be of a height to reach you. With the current design I have to place it on a small side table to be high enough to reach me in bed. I think it’s pretty quiet too. Also love the night mode so it gets rid of the annoying LED display when you are sleeping. So many great design features, it’s really been well thought through and is a great product.