I have no idea. I dust first. Of course I dust with a damp rag but if any dust ends up in the air it will end up on the carpet. That's why I vacuum 2nd and I wait a little between dusting and vacuuming.

Big heavy vacuums are out for me. I just can't manage them. I tried a canister vacuum and while I loved that I could use it and have not trouble, I found myself tripping over the canister. It's a no win situation. There are lightweight vacuums out there. A friend of mind told me about one that is lightweight, has great suction, and there is a dust buster type thing that detaches. I can't remember the brand name, it was either Eureka or Hoover. She recommended I get one.

DD20 had something similar but it was made by Shark and is cordless. It does not do well on carpets but works well on bare floors.