My son researched many options and I’m glad he chose this one. We are so surprised how much cleaner our air is now .didn’t realize how bad it was. Oh you left Panera older home and we need to replace our air ducks. This unit shows share of the air-quality and it turns blue when your errands finally clean. Helps us all breathe better and it covers a large area. We also have dogs and a lot of dander and dust helped with all of it