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Really, I thought most of Asia uses these types of air conditioners?

While we do have these in America, most homes use central air. Those units are about 3x the size of your typical Japanese aircon but can heat/cool an entire house. Honestly, for a family,​ I think central air is more efficient than having 3 separate aircons.

Yes you are right. I think the biggest advantage of central aircon system is that you don't have to deal with the extra space the individual machine is going to occupy.