Dusting furniture and dusting and vacuuming under things is a lot of what I do to try to keep dust down inside the house. I don't have carpets and limited curtains.
But overhead has things that collect dust, too. The tops of cabinets, fans, exhaust fans, and various other things up high can collect dust and not even be noticed.
Just because I can't see the dust, doesn't mean it isn't there. I'm allergic to it whether it is easily visible or not.
So today I went around with the vacuum and a ladder to take care of everything up high except the fans. I've already done them recently.