My forced air furnace filter does not and never has captured any exessive dust. Our home is 6 yres old and my wife has complained about the "dusty house" since day one. I've tried all different types of filters with no improvement. It seems to me that while the warm air and cool AC air is circulating, the return air isn't getting back to the furnace to pass through the filter in enough volume to capture the dust, but it seem to recirculate into the house. Any ideas or suggested solution?