Why Dust Comes Back After Cleaning Air Ducts
Ducts are only one dust source
A home can still create dust from carpets, pets, open windows, construction work, return leaks and a loose or low-quality furnace filter.
Check the filter and returns
Make sure the filter fits correctly, points the right direction and is changed on schedule. Return grilles and gaps around return ducts can pull in dusty air.
When to ask for help
If dust returns quickly with weak airflow or uneven rooms, ask about duct condition and furnace-area inspection.