How to Stop Your HVAC Filter From Getting So Dirty So Fast
by Elizabeth Yuko from Lifehacker on (#617YT)
When you change the air filter in your furnace, you expect the old one to be dirty. But let's say that when you go to make your regularly scheduled switch, you find that your old filter isn't just a little grimy-it's completely filthy. And it's not as though you left more time between filter changes, so it somehow...