Not sure why I hadn't purchased one of your systems sooner. We bought two because we're using one in our rental house as well; we believe providing a health environment for our tenants will help with rentability. Seems to us that this is a definite solution for allergies of all kinds and more important than ever in today's times with airborne viruses. The ability to create an environment that is cleaner and fresher is critical and although we are not expecting this to be our entire solution, we're happy knowing we're making a very solid effort in this realm.