HVAC Duct Cleaning in San Jose, CA

Why San Jose ducts load up and come apart

Attics here cycle hot and cool every day of a long cooling season. Flex liner expands, contracts, and slowly creeps off its collar. The inner core slips, the clamp holds only the jacket, and a supply run starts feeding the attic. Boots drop off ceiling registers the same way. In 1950s-70s tract stock the trunk is rigid galvanized sheet metal with branch takeoffs. The failures show up instead at unsealed plenum seams, where blown-in insulation fiber and attic dust get pulled into the airstream.

Load matters as much as leakage. Spring brings pollen and grass seed. Late summer brings wildfire smoke residue and fine soot. Most tract homes have one central hallway return grille, sometimes a panned joist return, so a single undersized return does all the filtration for the house. That return boot is usually the dirtiest thing in the system.

Check it yourself. Pull the filter and look at the cabinet floor. Look up through a register with a flashlight for gray fuzz on the boot edges. Crawlspace and basement runs in pre-war and hillside homes pick up soil moisture and rodent droppings. Nesting material turns up too. That's a different problem than dust.

Typical residential interval here is three to five years. Shorter after a remodel, because drywall dust gets everywhere.