oh Donna-I'm so sorry about your cat.
Re: air-I change the filter every 2 months. It's working pretty well. Most of the vents are good-idk-my fellow employees suggested cleaning the vents out myself with my sweeper. IF I call the guy back and he goes under the house...I'm afraid they would charge me too much for all that. It's much much better than it was before - having no air at all was not fun.