HVAC Duct Cleaning in Houston, TX

Why Houston duct systems get dirty fast

Humidity drives most of it. Attic flex duct sweats under a torn outer jacket. Insulation compresses, sags, and holds moisture. Dust settles in the low loops of sagging runs and stays there. Latent load on the evaporator coil never stops here. Drain pans stay wet. That is where microbial growth starts, not in the branch runs. Cleaning the ducts and ignoring the coil and pan solves nothing.

Housing stock matters. Homes built in the 1980s onward run insulated flex on sheet-metal or ductboard plenums in the attic. Older 1950s–70s houses use round galvanized or rigid fiberglass board trunks. Pier-and-beam homes with floor registers and panned-joist returns pull crawlspace air straight into the system. That last one is a construction issue, not a dirt issue.

We inspect before quoting. Common finds: a disconnected branch dumping cold air into the attic, rusted ductboard at the plenum, kinked flex, rodent or insect intrusion. A single undersized central return runs high static and whistles at the grille.

Typical interval here is three to five years. Sooner after flooding, remodeling, roof work, or with pets or smokers in the house.

If the flex is torn and compressed, cleaning it is wasted money. Replacement is the honest answer.