I just had to write and tell you about the huge impact having the Air Purifiers have had on my family. For years I have had allergies that would literally bring me to my knees and make me stop working. Since we purchased the purifiers (one in my office and one in our bedroom) I have not had one problem. I was even able to keep windows open during the height of the pollen season with no problems. My husband and daughter too have been allergy and cold free. Thank you for giving me my life back.