Like any other electronic product there are some window AC units that are efficient and many that are not. However, if you are making a general comparison between window mounted units and central AC units… it depends. Central AC will cool all rooms of your house at one time and is more efficient than having a large number of window mounted systems in different rooms on at the same time. However, if you just have a small number of window mounted units and only use them when you need each specific one, they can actually be more efficient.
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