I bought the Pure Guardian Ultrasonic Humidifier in early 2019 because the winter and dry heat has left my skin very dry and my nasal passages bleeding. The one I bought back then was tame and I have it in my bedroom. Because it worked great I wanted one for the living room so I wouldn't have to keep moving the first one I bought. This Pure Guardian H4750AR Ultrasonic Cool Mist Humidifier is a push button and has cool mist only, which is perfectly fine. Revain had the lowest price so thought I'd give it a try to see if it was worth it. So true! If you are looking for a larger capacity Ultrasonic Cool Mist Humidifier (meaning it requires no filters and produces an even mist) then this is a great buy. I've been using it for almost a week, it works day and night. I fill up and keep it at the highest level. It's really quiet and like I said, it's a nice thin mist. Pure Guardian are definitely great products. According to the manual, there is a 3-year guarantee.