Which brand? Ive used the mitsubishi and fujitsus and was pretty impressed.
The older units are Sanyo. The newer ones are Panasonic. I wish I had gone Panasonic to begin with.
Mitsu makes a great system. Daikin is good as well. They are all similar in the way they operate but the more advanced systems have all the sensors and intelligence built in. The Panasonic can detect how many people are in a room and adjust the cooling accordingly. If I am the only person in the room it directs the airflow more in my direction. It also purifies the air.