Air Duct Cleaning in Redwood City, CA

Frequently Asked Questions

1. My house is a Redwood Shores place on a slab — where does the ductwork even run?

   Almost always overhead, in the attic, as insulated flex branching off a plenum. That matters for cleaning because flex can't be brushed the way rigid metal can. It gets agitated and vacuumed under negative pressure with softer tools so the inner liner doesn't tear. The other Redwood Shores factor is moisture. The homes sit on dredged bay fill with lagoons and sloughs all around, so ground and ambient humidity run higher than the rest of town, and that shows up as damp attic air and musty-smelling supply registers. We check the flex runs for sagging and crushed sections while we're up there, because a collapsed belly in a flex line holds moisture and collects everything that passes.

2. Why do my ducts seem dirtier than my friend's place up in Daly City?

   Mostly run hours. Redwood City is the warm, sunny pocket of the central Peninsula, which is why so many homes here actually have air conditioning when the fog-belt cities north of us don't bother. A longer cooling season means more hours of air moving through those ducts, more condensate at the coil, and more coil fouling. Add oak and grass pollen blowing off the western hills in spring and the construction dust that's been constant around downtown redevelopment, and the system is processing more material per year than a comparable house ten miles north.

3. What usually turns out to be the actual problem in older homes near downtown or Mount Carmel?

   Retrofit crawlspace ductwork. Those 1900s–1930s bungalows and cottages were built on raised foundations without central air in mind, so the ducts were added later and run under the floor. What we commonly find is disconnected or partially separated boots at the register, old tape that's given up, and insulation sleeves that have slipped off and left bare metal sweating in a damp crawlspace. Cleaning helps, but if a run is pulling crawlspace air instead of conditioned air, sealing that connection matters more than anything we vacuum out. We'll tell you plainly which one you're dealing with before we price anything.

4. Can you come out same day?

   Sometimes, especially midweek and in the shoulder seasons. The hard stretch is the first real warm run of the year, when a lot of Redwood City households switch the AC on after months idle, smell something off, and call the same week. During those stretches we're usually booking a couple of days out. If you're calling because the system is off entirely or there's a strong odor every time it kicks on, say so when you call. That moves you up, since it may be a condensate or coil issue rather than a cleaning job.