There are only two optimal programs, one is the four sides of the wind type, the United States of America, the biggest advantage of this model is the warranty of six years, is a good choice.

One kind of air duct machine is the kind with air outlet and return air outlet, the price is higher? With four-sided air outlet type, and the warranty is only ? Two years, but can be flexible with the decoration. If there is a small private room is recommended to use the wall-mounted machine can be, choose a little more upscale if you can choose a small air duct machine.

If it is open to choose at least three to four five-horsepower.