“It is pretty simple. If your attic is not sealed off, your insulation actually contributes to the dust in your living space,” McGraw said. “Attic air sealing closes up all those tiny wire and pipe penetrations so attic insulation and debris cannot make their way into your home.”
Ductwork can play a similar role. According to McGraw, leaks can allow airborne insulation, outdoor dirt and debris into the system, where they can ultimately be circulated back through the home.
“Pairing a sealed duct system with a properly sealed attic stops that dirty air from circulating,” he said.
Pay attention to where dust collects
The location can also provide clues about what is happening inside a home. McGraw said dust collecting on supply registers can point toward leaky ducts or attic sealing issues, while dust around exterior doors and windows may indicate outside air leaks.
“Dust settling on interior doors: That is a sign of a room pressure imbalance, which you can fix by adding returns or rebalancing the system,” McGraw said.
For homeowners trying to get ahead of the problem, one of the simplest habits is staying on top of HVAC filter changes. McGraw recommends changing filters every one to two months.
Derendal also recommends routine dusting and vacuuming, including commonly overlooked areas such as ceiling fans, vents, blinds and furniture. Keeping doors and windows closed during dust storms and windy conditions, maintaining good seals around windows and doors, and regularly vacuuming carpets, rugs and upholstery can also help.
For homeowners who want to understand exactly where their dust problem is coming from, McGraw recommends starting with a professional home energy audit.