My mother-in-law suffers from asthma, and every time she comes to our house, she gets her asthma. She visits us once or twice a month to watch our kids and pets while we go out. We have a full house with kids, three dogs, three cats, and a house rabbit. In the past, we have tried everything to eliminate whatever causes her to get asthma. We scrub our house clean, clean underneath all the furniture to ensure all the pet hair is gone, vacuum the cat trees, and wash all our bedding and covers. It helps, but she still uses her inhaler at least once or twice a day.  That is until we started using the DH Lifelabs Sciaire Mini + Hepa Air Purifier. Now, whenever she comes over, she does not have to use her inhaler. We keep it on auto 24 hours a day. My mom was so impressed with how it cleaned the air that she bought one for her home. The purifier not only works amazingly, but the quality is excellent. It's sturdy, heavy, and has a great look.