Signs your system actually needs attention

Real reasons to call

1. Visible dust or debris blowing from the vents.
2. Mold on or around registers, or a musty smell when the system runs.
3. Evidence of rodents or insects in the ductwork.
4. A recent renovation that put drywall or construction dust into the system.
5. A dryer that has become slow — a vent issue, and the safety-relevant one.