I don't know if this idea is new to anyone else, but it was new to me about a year ago. I have quite a few pets, and I was having to change my filter for my central heat/AC quite often. I decided, "Why not try vacuuming out the pet hair and dust that has accumulated? That way, I can stretch the filter for a couple of months instead of twice *a month*.
Does anyone else vacuum their filter to make it last longer?