How to Clean Heating Ducts

  1. Use tissues or cloth to cover the supply registers (the ducts where the heat comes out). You do this is to avoid loose debris being blown into your rooms.
  2. Switch the fan on and turn the heating/cooling function off. 
  3. Remove your furnice filter and clean.
  4. Move through while tapping along the ducts to knock free dust and dirt.
  5. Using a vacuum, clean each supply register and down into the duct tunnel. The fan will keep loose dust moving.
  6. Find your return air registers and unscrew the cover. Use your vacuum to clean inside and as far as your vacuum hose allows. Screw the cover back on.
  7. Turn off the unit and unscrew the blower compartment on the furnace. Clean inside with your vacuum and screw the cover back on.