[goat granny]

a good portion of dust in the house comes from the furnace blowing dust through the duct work. I find very little dust on the furniture in the basement...Had a Christmas tree in the basement,decorated and after several years it still wasn't dusty. Of course some of the dust is made up of castoff old skin flakes and any animal in the house...

[Aliska]

It may have been radiator heat. But still you’d expect some spider webs. Well I don’t have 30 years to shut off a room and try an experiment lol.