This is an extremely thoughtfully designed air filter and heater. The unit has filter function has several settings including auto. Since we've placed this in our bedroom we have set it to auto so it keeps the air in the room nice and clean without having to run in high unnecessarily. I'm a fairly light sleeper and and not bothered by the minimal white noise it produces. 

Additionally I like how the display has three light setting (high, low, and off) since at night it can slightly illuminate the room we have full control over it. 

The filter/heater combo has the ability to oscillate back and forth which is perfect for us. All in all a great product to wone.