This is my first year to experience seasonal allergies. I understand that once an allergic condition develops, it stays with you for life. Wow. It is miserable. Sneezing, runny nose, crying eyes, aloe tissues. I made an appointment with an allergist and ordered a BreatheSmart for the living room. We think this machine is AWESOME. If I just stay in the house, I am 90% problem-solved. After using the BreatheSmart for three days we were so impressed, we ordered the smaller unit BreatheSmart FIT50 for the bedroom.