We have the same experience also. We have had our ducts cleaned. We have lived in this house about 6 years now and it has not slowed down at all. The worst room is the master bedroom, which is the farthest from the beginning of the heat system. We have wood floors so dust will be easily seen, especially under the bed. I wonder if the "dust" is some of the finer blown in insulation finding its way into a duct via an opening or slit in the duct work. The dust mop is used continually, along with surface dust on furniture. We change our furnace filter on a regular basis also.
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