Not every dusty room means the ducts need cleaning. The useful signs are conditions that point back to the forced-air system: visible material being released from registers, a confirmed buildup found during inspection, debris after renovation, pest evidence or an unknown maintenance history in a newly purchased home.
Look for evidence, not fear-based claims
Grey marks around a register can also come from air leakage, candles or filtration problems. A musty odour may originate at a cooling coil, drain pan or damp return cavity. A professional should inspect before recommending a full air duct cleaning.
After renovations and move-in
Drywall sanding and demolition generate very fine dust. Schedule cleaning only after dust-producing work and final construction cleanup are complete. Homebuyers may also use an inspection to establish a maintenance baseline.
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Review the GTA service areas for local coverage, neighbourhood information and city-specific FAQs.