I live out west so I wanted an air filter for the wildfire smoke and could not be more happy with this filter. I just leave it on auto mode 24/7. When the air is clean it’s so quiet you can barely tell it’s on. However, it automatically senses when it needs to kick it up a notch (like every time I cook and put smoke in the air). I love the little light sensor that indicates the air quality. We call it “Mo” after the cute cleaning robot in Wall-E because it’s so sleek and I feel like it communicates with us. Definitely worth the price!!