Turn off the HVAC system and disconnect power
Remove and clean vent covers and registers
Vacuum loose dust from accessible duct openings
Use a brush attachment to loosen debris inside ducts
Wipe interior duct surfaces with a damp microfiber cloth where reachable
Clean the blower compartment, fan, and air handler components
Replace the air filter with a new one
Clean or replace the return air grille
Inspect ducts for mold, pests, leaks, or damage
Seal any visible gaps or leaks in the ductwork
Reassemble all covers and registers
Restore power and run the system to check airflow
Schedule professional duct cleaning for deep cleaning or heavy contamination