Houston Duct Why the "$600 average" you see online is almost meaningless
Search aggregators love to publish a single average price for duct cleaning, and in Houston that number usually lands somewhere around $600. It's not wrong, exactly — it's just an average of two markets that have almost nothing to do with each other. One is the $13–$99 bait tier: a coupon-mailer price that buys supply-vent brushing on one unit and a can of deodorizer, with the upsell pitch delivered once the truck is in your driveway. The other is real per-system duct cleaning, which in this market runs roughly $350–$550 for duct-only work, and $900–$1,600 per system with a NADCA-member operator doing full negative-pressure cleaning with photo documentation. Average those two tiers together and you get a number that describes neither one.
The honest way to shop this is to figure out which tier you're actually being quoted, not to chase a number that sounds low. A price with no mention of the plenum, the trunk line, or how many supply and return runs are included is very likely the bait tier, whatever it's called on the invoice.
What a legitimate per-system price actually includes
A real per-system quote should account for the whole air path, not just the parts you can see from the room. That means:
- Supply registers and boots — typically $25–$50 per supply if priced individually
- Return grilles and the return duct behind them — $40–$75 per return, since returns tend to be larger and dirtier
- The plenum and trunk line — the shared trunk that every branch ties into, and the part bait-tier jobs almost always skip
- The air handler cabinet interior, where allowed without touching licensed components
Whole-home jobs on a typical two- or three-ton Houston system land in that $350–$1,600 range depending on register count, attic access, and whether the operator is running true negative-pressure equipment or just a shop vac with a brush attachment. For the mechanics of what gets touched room by room, see whole-home air duct cleaning.
Where duct cleaning stops and licensed HVAC work starts
Two components sit right at that line: the evaporator coil and the blower assembly. Both live inside the air handler, both get dirty, and neither one is duct. Coil cleaning generally runs $150–$500 and blower cleaning $150–$400 when done by a licensed HVAC contractor — a duct cleaner without an HVAC license shouldn't be opening either one. If a quote bundles "coil sanitizing" into a flat duct-cleaning price with no mention of licensing, that's worth asking about directly. The line is explained in more detail at coil, blower and sanitizing.
Dryer vents price separately, and roof runs cost more
Dryer vent cleaning is quoted on its own scale because the job itself is different: a wall termination behind the house typically runs $99–$189, while a roof termination — common on two-story houses in League City, Pearland, and other newer subdivisions where the vent has to run up and out through the roof deck instead of the back wall — runs $150–$275 because of the extra length and roof access. If your dryer is taking two cycles to dry a load, that's usually a vent problem before it's a dryer problem.
A five-step way to read any quote you're handed
- Ask how many supplies and returns are included by count, not just "whole system."
- Ask whether the plenum and trunk line are cleaned or only the branch runs.
- Ask if coil or blower work is separate and, if included, who is licensed to do it.
- Ask what equipment is used — true negative-pressure vacuum collection versus a handheld brush and shop vac changes both the price and the result.
- Ask for the price in writing before the truck leaves, not as a range that firms up on-site.
Houses that recently went through a remodel — a kitchen gut in Cinco Ranch, a full renovation after Harvey flooding inland — often need a different scope entirely, since construction dust settles into the duct system in ways a standard cleaning doesn't fully address; that's covered separately at duct cleaning after a remodel or new build.
The bottom line: in Houston, a duct cleaning price under $100 or over $2,000 for a normal single-family system is the exception, not the range, so ask what's included before you compare numbers.