Air ducts likely need cleaning when you see dust collecting on or inside vents, smell a musty odor when the HVAC starts, notice worsened allergies, or feel weak or uneven airflow from certain registers. The usual cause is a buildup of dust and dander in the return and supply runs that your filter no longer catches. We frequently encounter this in homes around Fairmount after heavy heating or cooling seasons, especially with pets. One technician cue: if a freshly wiped return grille looks gray again within days, the duct side is dirty, not just the room air.
Watch for these specific signals:
- A visible gray “mat” or fuzz just inside supply registers
- A small puff of dust when the blower kicks on
- More sneezing or congestion only when the system runs
- Filter loading unusually fast or needing early replacement
If these show up, check and replace the filter, then schedule a professional inspection; proper duct cleaning uses negative pressure to clear built-up debris safely.
Updated: 2026-09-28
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