Searching for the "best dryer vent cleaning" company turns up a wall of directories and $99 offers that all look the same. They are not. Here is how to tell a certified professional from a lead-generation front, and the questions that separate a real inspection from a quick brush-and-go.

What does CDET certification mean?

CDET stands for Certified Dryer Exhaust Technician, a certification issued by the Chimney Safety Institute of America (CSIA). A CDET-certified technician is trained in the NFPA 54 fuel-gas code, correct duct materials, airflow testing, and fire-safety protocols. Hiring a CDET-certified company means the person cleaning your vent knows what code-compliant looks like, not just how to run a brush.

Why does the certification matter for safety?

Clogged dryer vents cause more than 15,000 home fires a year in the United States, according to the U.S. Fire Administration, and lint is the leading cause. A certified technician does more than remove lint: they verify the transition duct is UL 2158A-rated (not flammable foil or plastic), confirm the exterior vent damper works, and measure airflow before and after. Those checks are where fire risk actually lives.

What questions should I ask before hiring?

  • Are your technicians CDET-certified? Ask for the certification, not just "trained."
  • Do you provide a written condition report? A real inspection produces before/after airflow measurements and photos.
  • Is your pricing fixed, or a starting price? Fixed pricing avoids the on-site upsell that "$99" offers rely on.
  • How do you protect my home? Look for HEPA-filtered vacuum systems and a mess-free guarantee.
  • Are you licensed and insured? This should be a yes without hesitation.

Why are the cheapest quotes usually not the cheapest job?

A widely advertised "$99 dryer vent cleaning" is typically a door-opener. The visit often ends with add-ons for the work that actually matters (transition-duct replacement, roof-jack service, airflow correction). Transparent, fixed pricing that includes the inspection is almost always the lower total cost and the lower risk.

How often should a dryer vent be cleaned?

For most households, once a year. Larger families, longer vent runs, and homes with pets should consider every six months. If your clothes take more than one cycle to dry, the dryer is hot to the touch, or you smell a burning odor, have it inspected sooner regardless of the calendar.

How to compare companies quickly

Favor a company that is (1) CDET-certified, (2) fixed-price with the inspection included, (3) able to show written before/after reports, and (4) verifiably reviewed on Google with recent, specific reviews. A directory listing or a generic "certified technicians" claim with no certification named is a signal to keep looking.

Dryer Vent Specialists is a CDET-certified, veteran-owned company serving the San Mateo County Peninsula with fixed, transparent pricing, written airflow reports, and a zero-mess guarantee. If you want a straight answer about your vent, that is the standard to measure any company against.