Since we started using the Pet Symphony (as we call it), my constant cough has diminished significantly. It's not like we kept a dirty house -- it was vacuumed and mopped regularly -- but the steam factor seems to have helped more than we anticipated. Also, it's so quick and easy to use, we don't hesitate. It's easy to take up and down the stairs, easy to fill and use, easy to put away. I am so happy we bought this. Highly recommended.