Reviews of ductless air conditioners highlight the pros and cons of a brand and can compare one brand to another. HVAC For Beginners, a heating, venting and air conditioning resource and review website, states that the best basic brand is Carrier by United Technologies, Comfort Series and Performance Residential Series.
The review describes the best premium ductless units and the best mini-split units. In the former category, the IVT brand by Bosch, manufactured in Sweden, is expensive but highly efficient. The best mini-split unit, used to cool several rooms with a single exterior condenser, is the Daikin MXS brand. This brand features intelligent settings that can sense, via infrared, when a room is unoccupied, and change the temperature settings accordingly.