Where remodel dust ends up
Sanding drywall, cutting tile and tearing out old finishes put fine dust into the air, and the dust goes wherever the air goes. If the furnace or air conditioner fan runs, it can pull that dust into return registers and carry it through the ducts. Some of it settles inside, and some comes back out through the supply registers later.
Protect the ducts during the project
- Cover or seal the registers in the work area so dust cannot get in.
- Ask your contractor whether the system should run during the work, and follow the answer.
- Change the filter often while the project is under way.
- Clean up daily, so dust does not build up and get stirred around again.
When to schedule a cleaning
Wait until the dusty work is done, then book the cleaning before you move furniture back in. That way the ducts are cleared once, and the dust from the last sanding pass is not left to settle on your belongings.
Common questions
Should I run the furnace while drywall is being sanded?
Follow your contractor's and furnace maker's guidance. Many contractors cover the return registers or ask you to turn the system off during sanding, because the fan can pull fine dust into the ducts.
Do I need to clean the ducts after a small project like painting one room?
Usually not. Painting a single room makes little dust. If sanding, cutting or demolition happened and the system was running, a duct check may still be worthwhile.
Can old-house renovation dust be hazardous?
In an older home, paint or materials may contain lead or asbestos. Testing and handling those materials are jobs for licensed specialists, and we do not do that work. Ask your contractor before the project starts.
Should I clean the ducts before or after new flooring?
After the dusty work is done. Sanding and cutting flooring creates dust that can settle in the ducts, so cleaning once the installers finish keeps you from doing it twice.
Want a hand? See our cleaning services or where we work.