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I would think one unit for each floor would be fine. One unit would not cover two floors.
Sorry, there was a problem. Please try again later.Yes it will definitely make a big difference. I bought 1 for each floor in my house. They move a lot of air and they are quiet.
Sorry, there was a problem. Please try again later.They can only do what they say up yo 550 sqft. Id get at least 3, 4 will make them not have to be on high all the time. But they are miracle machines. Soooo much better than my old and more expensive air purifier.
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