Notes from my continuing quest for a non-allergenic environment:
If I cannot move all the furniture away from the walls and dust behind it, I have too much stuff in the room. Bookcases are an unhappy exeception, and I've no idea how one keeps a library clean.
Vacuum cleaners only superficially clean carpet; every so often people with special equipment must be hired to do a more thorough job. One can rent simplified equipment, but one probably can't do as good a job as the pros.
There is no way to dust under a wall-to-wall carpet.
Keeping upholstery clean is almost as much trouble as keeping carpet clean.