we use and sell Austin Air. we love it! We use it for smoke in the summer when fires are burning or in the winter as we have a wood stove. Pollen in the spring, germs and bacteria when we are sick. we run it in our bedrooms at night to ensure we are breathing clean air during the night when our bodies are meant to rest, heal and rejuvenate. also we are concerned there could be mold in our walls so that is another reason. Austin Air is a great mid priced purifier that performs great and is easy to care for. Filters get replaced every 5 years. we get really great feedback from customers as well.