Promising reviews: "We retired to the Southwest US, which is just a huge dust bowl. I didn’t want to be breathing in the dust, and I absolutely hate dusting furniture. So I researched air purifiers and chose this model. In order to filter dust, it seems I needed a HEPA filter, which this purifier uses. While not washable, they can be vacuumed, which I do about once a week, so they last longer. Overall, the price for the purifier and the filters was less for this model than for others I researched. I bought the large model of this purifier for the main room of our 1,200-square-foot townhouse, and it works really well. I only have to dust every 3–4 weeks, which suits me just fine. I think the purifier is about as loud as a white noise machine, so not very loud in my opinion. My husband, who wears hearing aids, finds it noisier than I do. I bought two of the smaller versions of this same purifier for the two bedrooms.…