I expected a noisy machine when I got this but soon found out how quiet it runs. It started purifying right away. Room went from 70 to 100 and noticed a cooler feeling in my breathing. There is light that can be dimmed for sleeping which is very nice. The fan is adjustable and there is also a timer. The base where the filter is located is easy to open for filter changing. My brother has a cold so I ran it close to him to remove germs and Ifeel better knowing my air quality is better.