We have a Coway air purifier and have liked it. It's very quiet. We bought it based on reviews in Wirecutter. Hard to know exactly how well any of them work but ironically the only time it kicks into overdrive is when I nebulize!

The one linked below is the one we have in our bedroom but there are many different sizes based on the square footage of the area you're trying to cover

Coway: https://cowaymega.com/products/mighty-ap-1512hh
Wirecutter Reviews: https://www.nytimes.com/wirecutter/reviews/best-air-purifier/