Air Duct Cleaning in San Bruno, CA

Frequently Asked Questions

1. My ducts smell musty when the heat first comes on in the fall — is that normal here?

   It's common in San Bruno, and it comes down to how these systems are used. Most homes here have little or no AC, so the ducts sit idle and cold through the foggy summer while marine air funnels through the Gap. Moisture settles into the dust already in the runs, and nothing dries it out until you fire the furnace in late fall. That first burn-off smell is usually damp settled dust, sometimes light surface mold on the inside of the boot or near the return. If it fades in a day or two it's dust. If it lingers, or you smell it every time the thermostat kicks on, the ducts are worth looking at before winter runs them hard.

2. What usually goes wrong with ducts in the 1940s and 50s tract houses around here?

   The short, undersized runs in these postwar homes don't give dust anywhere to settle gently. It collects in the elbows and at the boots. Most of these houses have a single central return, so that one filter and grille are doing all the work, and when it's undersized or neglected, everything downstream gets dirty fast. On slab and shallow-crawlspace homes we often find duct sitting in a damp crawl or in a floor trench where old insulation has sagged or torn. Closet forced-air units bring their own issue: tight cabinets, minimal clearance, and return air pulling from the closet or hallway rather than a sealed path. Wall furnace homes don't have ducts at all in some rooms, which surprises people when they call.

3. How fast can someone get out here?

   San Bruno is compact and easy to cover, so scheduling is usually quick, often within a couple of days, sometimes sooner. The realistic constraint is the calendar, not the drive. From late fall onward, when everyone turns the heat on at once and smells what's been sitting in the ducts since spring, bookings tighten. If you're planning ahead, the long foggy stretch of summer is the easiest time to get a slot, and it's arguably the better time to clean anyway, since you're clearing out damp-season buildup before the heating season starts.

4. Do you ever do same-day work?

   Sometimes, depending on the day and where our crew already is on the Peninsula. Same-day is more likely for a smaller single-story home with one return and short runs, which describes a lot of San Bruno, than for a hillside house with a longer or more awkward duct layout. Call and ask rather than assume. If we can't fit you in that day we'll tell you straight and give you the next real opening instead of a vague window.