Instruct: Classify Amazon reviews into positive or negative sentiment
Query: happy customer

so my roommate thinks its a little loud when its on high, but I don't find it that noisy. It's still not as noisy as our dishwasher. It cleans the air remarkably well. I was having serious problems breathing before, and wouldn't be able to sleep since I would be coughing all night. With this, now even my roommate thinks the air smells cleaner.