What to know
What is worth doing yourself
- Lift out the register covers — most come out with a screwdriver — and wash them in the sink.
- Vacuum the visible opening and as far into the boot as the hose reaches.
- Wipe the register face when you clean the room, so what has settled there is not pulled back in.
- Do the return grilles as well. They collect faster than the supplies and are usually the ones people skip.
That handles the part you can see, which is also the part guests notice. It is a reasonable Saturday job and it makes a visible difference at the openings.
Where the limit is
Past the boot, a household or shop vacuum is working against physics. It can pull what is close to the nozzle; it cannot reach material sitting in a run behind a wall, and it has no way to loosen anything that has settled and compacted.
A shop vacuum is a good tool and we own several. It is still not a duct cleaning system, and that is worth saying plainly rather than leaving you feeling you should have managed it.
What professional cleaning actually does differently
The system is put under controlled negative pressure — contractor language for a strong, steady vacuum on the ductwork itself — while tools work through the runs loosening what has settled. That combination is what gives the debris somewhere to go besides back into the room.
It is the pressure and the access that matter, not the size of the vacuum.
Where the dust is really coming from
Worth setting expectations honestly: most of the dust that settles on your furniture is generated inside the house, by living in it. Cleaning the ducts will not make a home dust-free, and anyone promising that is overselling.
What it does address is what has accumulated inside the system itself — which matters most when there has been remodelling, when pets have been shedding into the returns for years, or when nobody knows the history of the house.
When it is worth calling
If you can see accumulation past the point your vacuum reaches, if airflow has dropped for reasons the filter does not explain, or if there has been construction work in the house, that is a sensible time to have the system looked at.
The inspection costs nothing, and finding out the system is in reasonable shape is a perfectly good result.