Duct cleaning is one of the most-marketed and most-misunderstood HVAC services. The honest truth: most homes don't need it every year, but most homes do need it eventually. Here's how to tell when it's time, what a real cleaning includes, and what to avoid.
Six signs your ducts need cleaning
- Visible dust at the supply registers. Pull a register cover off. If there's a layer of dust inside the boot, the whole system has it.
- New home, never cleaned. Construction debris (drywall dust, sawdust, scraps) gets sucked into the return side during the build. Most builders don't clean ducts at handoff.
- Pets in the home. Hair and dander accumulate in the return ducts and on the blower wheel. Both reduce airflow.
- Allergy symptoms that get worse with the system running. If your nose starts when the HVAC kicks on, the ducts are part of the chain.
- Recent renovation. Drywall, demo, sanding - all of it ends up in the return air path.
- Musty smell when the AC starts. Could be the coil, could be a wet section of duct insulation. Inspection tells you which.
What a real duct cleaning includes
A proper duct cleaning takes 3-5 hours for a 2,500-4,000 sq ft home with two technicians. It includes:
- Negative-pressure HEPA vacuum hooked to the trunk line
- Compressed-air agitation (whips, skipper balls) inside every supply and return
- Hand cleaning of every register and grille
- Plenum cleaning at the air handler
- Blower wheel and coil inspection (extra service if dirty)
- Before and after photos inside the ducts
What to avoid
The $79 duct cleaning ads are a bait-and-switch. They show up with a shop vac, hit the closest two registers, and try to sell you $2,000 of "mold treatment" they invented in your laundry room. A real cleaning is $450-$900 for a typical Brentwood home depending on system count and vent count. If a quote is dramatically lower, ask what they're skipping.
How often, realistically
Most Williamson County homes are fine with duct cleaning every 5-7 years. Homes with pets, allergies, or recent renovations: every 3-5 years. Brand-new construction: once in the first year, then on the normal cycle.
Want an honest assessment? We'll inspect your ducts with a scope camera and tell you if it's worth cleaning. Call (615) 254-6283.