It is so hard to tell how your health is improving because in Houston during allergy season, it is a constant challenge. Having said that I REALLY love the fact that the Fit50 clearly displays and adjusts the fan speed to meet current contaminant levels. It is eyeopening to observe the speed go from slow to medium shortly after the front door opens, hence, I have every confidence that the unit is doing exactly what it is intended to do. Furthermore, it is really not loud even on the highest setting.