The Koios Purifier Indoor Air Cleaner is an affordable, durable, and surprisingly child-friendly air purifying unit. It can become a little loud sometimes, and its area of effect is limited to the room it\u2019s in, but for $55.00 it\u2019s hard to complain. Check out our best air purifier under 100 list for more great air purifiers!\r\n\r\n\r\nWhy We Like It - Koios Upgraded Purifier\r\nThe Koios Air Purifier Indoor unit is not only an excellent air purifier, but it looks quite nice and can add a spark of class to whatever room you decide to place it. It can double as a night light for you kid or you (don\u2019t worry, I won\u2019t tell), and can kill smoke and pet dander just as easily as dust particles.\r\n\r\n\r\nPerformance\r\nKoios Air Purifiers improve air quality via a three-stage filtration system: fine preliminary (pre filter), true HEPA filter, and activated carbon filter. The filtration systems work one after the other to kill 99.97% of particles and odors, including pet dander, to give the room the best air possible. The true HEPA Technology also allows the unit to eliminate dust, pollen, and even smoke from rooms. If this sounds like too much and you just want a basic office odor allergies eliminator, we suggest the GermGuardian GG1000 Pluggable Deodorizer Guardian.\r\nDesign\r\nThe Koios True HEPA Air Purifier features a one button operation which controls both the fan speed and the stage filtration night light. It couldn\u2019t be easier to both clean your air and protect your state of mind while you\u2019re sleeping. Anyone with a child will know how scary they get when their rooms are completely dark. Because the unit can eliminate odours from smoke dust pets and many other sources you\u2019d expect it to be rather large, like the GermGuardian AC4825. But in fact it\u2019s actually quite small, compact, and easily transportable from room to room for a whole house clean.\r\nValue\r\nThe Koios Air Purifier reviews on Amazon rank it at 4.5 stars out of 5 based on 3,320 reviews. Not too shabby. The unit retails on Amazon for $55.00 which is a decent price for an air purifier that filters out the likes of smoke and pet dander. The Levoit Filtration Eliminators Vista 200 retails for almost $90.00 on Amazon and is almost exactly comparable to the Koios. The Koios Upgraded Purifier, if you\u2019re not already sold on it for some reason, is also 100% Ozone Free Certified by Carb.\r\nKoios Upgraded Purifier Wrap Up\r\nThe Koios Upgraded Air Purifier is a sleek, compact air purifier that can double as a night light for your little one. It\u2019s mystifying that the night light cannot be turned off though, so let\u2019s hope the people at Koios resolve this issue with their next purifier. Overall, though, for the performance it\u2019s capable of and what it\u2019s priced at, you can\u2019t really go wrong.