It's good. It lives up to its reputation of being quiet, provided you don't push it too hard, and don't use the energy saver option, which sets you up for a night of rough starts and stops. It's the most expensive unit we've ever had, and the value seems to be solely in the reduction of noise... so if that's not what you're after, I'd look elsewhere. You also can't run it too hard or too long or it ICES UP. I'm not kidding. The way you'll know it's iced over is the knocking sound that happens, usually when you are fast asleep.