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Do you have any pets? It could be pet dander.
I've seen tons of dirt left behind UNDER the carpet during the installation!
During the day when light is entering into the room, if you see dust floating in air, then what your seeing is common household dust.
If you own a forced warm air heat system and or have Central AC you can purchase a HEPA filter system, or electronic air filter and attach it to the ducts. This will go a long way in keeping the dust down.
Also lots of dust is dependent on your location. Areas of wooded lots tend to have more microbial forms of dust while homes near high traffic locations tend to have more carbon based dust partials in the air.
In any case, filtration and use of a true HEPA filter vacuum not HEPA like vacuum will make a big difference in the dust on the furniture.
It turned out to be (construction) burning taking place several miles down the road. Insurance verified, and the entire neighborhood had to have fire cleanup crews come in.
Just another idea
And are there people who within the home are suffering from any unexplained illness? Do you open windows and use fans to vent the house? What changed in the surroundings of the rooms effected? That can lead to clues.
Dust can come from many things. Color, texture, greasy or not it all has a source that must be found and controlled. Getting it analyzed by a professional lab is the only sure fired way to determine what it is, and armed with that you can figure out the cause.
Even a failure of a electrical fan motor or failure of insulation within the duct system if it exists can cause this occurrence.
Thanks for your help. Will try some of these