Turn off the HVAC system
Remove vent covers
Vacuum loose dust from registers and openings
Clean vent covers with soap and water
Use a vacuum with a hose and brush attachment to clean accessible duct openings
Brush visible dust and debris toward the vacuum
Clean the blower compartment, if accessible
Replace or clean the air filter
Reattach vent covers
Turn the system back on
Schedule professional duct cleaning if buildup is heavy or ducts are hard to reach