Clean air ducts

Clean accessible areas of your air ducts to improve air quality between professional cleanings.

Why it matters#

Dust and debris in ducts reduce air quality and HVAC efficiency. Surface cleaning improves the air you breathe while full professional cleaning handles the rest.

What you'll need#

Tools#

Screwdriver
Vacuum with hose and brush attachment
Soft brush
Flashlight

Steps#

1. Understand the scope#

Full duct cleaning requires professional equipment. This guide covers surface cleaning of accessible areas that improves air quality between professional cleanings.

2. Turn off the HVAC system#

Shut off heating/cooling at the thermostat to prevent blowing dust while you work.

3. Remove vent covers#

Unscrew or unclip each vent cover (registers and returns) and set aside.

4. Wash vent covers#

Soak covers in warm soapy water, scrub off dust and buildup, rinse, and let dry.

5. Vacuum inside ducts#

Using your vacuum hose with brush attachment, reach into each duct opening and vacuum as far as you can reach—typically 1-2 feet.

6. Brush duct walls#

Use a soft brush to loosen dust on duct walls within reach, then vacuum again.

7. Check for visible problems#

Shine a flashlight into ducts. Look for mold, excessive debris, pest droppings, or disconnected sections.

8. Clean return air vents#

Return vents (the larger ones that pull air in) accumulate more dust. Pay extra attention to these.

10. Replace the HVAC filter#

Install a fresh filter—this captures dust loosened during cleaning.

Pro tips#

DIY surface cleaning every 6-12 months improves air quality
Professional full duct cleaning is recommended every 3-5 years, or after renovation
If anyone in the household has allergies or asthma, clean ducts more frequently
Clean ducts before and after major dusty projects (sanding, renovation)

Warnings#

Don't use water or wet cleaning inside ducts—moisture promotes mold growth
If you see mold, stop and call a professional—mold requires specialized treatment
Flexible ductwork can be damaged easily—be gentle with the vacuum hose

Schedule professional duct cleaning ($300-500 for a typical home) if: you see visible mold growth, there's evidence of pests in ducts, excessive debris is visible, after major renovation work, or when moving into a new home.