How do you tell if your air ducts are clogged?

Determining whether your home's residential air ducts are severely clogged requires observing specific performance drop-offs, visual cues, and environmental symptoms. Key warning signs include a dramatic, sudden drop in airflow coming out of multiple supply vents across your house, a noticeable increase in household dust settling on furniture shortly after cleaning, and musty odors blowing from registers when the HVAC system turns on. Visually, you can remove a supply vent cover and use a flashlight and smartphone camera to inspect the interior duct walls for thick layers of dust, pet hair, or debris. You can troubleshoot by checking your air filter condition. You can verify that your ducts are clogged when professional camera inspections reveal heavy particulate blockages throughout the trunk lines requiring professional cleaning.