Air Duct Cleaning in San Carlos, CA

Frequently Asked Questions

1. My house is a split-level up in the hills and the ducts run under the floor — can those even be cleaned properly?

   Yes, but it's a different job than a flat attic system. Stepped and split-level foundations in San Carlos create crawlspace runs that are long, sloped, and rarely straight. Flex duct on those runs tends to sag between supports, and those bellies are where dust and debris settle. We work the runs from both ends where access allows and check support straps while we're under there, since cleaning a sagging run without re-hanging it just means it fills again. On some hillside crawlspaces the clearance is tight enough that we'll want to see it before committing to a time window.

2. We put in a new high-efficiency furnace and AC but the old ducts stayed — does cleaning actually help?

   It helps, but it may not fix what's bothering you. Many San Carlos homes from the 1940s–60s had the equipment replaced during a remodel or rebuild while the original trunk lines stayed in place, and those trunks are often undersized for the new blower. Cleaning removes the accumulated load and gets you honest airflow through what's there. But if the trunk is too small, you'll still hear noise and feel uneven rooms. We'll tell you straight if what you're describing sounds like a sizing issue rather than a dirt issue.

3. Why does the dust come back so fast in summer?

   The open hillsides and golden grass above town shed pollen and fine soil dust through the dry months, and it gets pulled in through returns, attic penetrations, and open windows. Homes on the upper streets under oak and bay laurel also deal with year-round leaf litter and fine organic debris near attic vents. If you're running AC with windows closed and still seeing it settle quickly, the return side and filter fit usually matter more than the supply runs. That's where we look first.

4. What makes one San Carlos quote higher than another?

   Mostly access and run count. A flatland ranch with attic runs and a straightforward return is on the simpler end. A hillside split-level with crawlspace runs on two or three levels takes longer, since each level has its own access and the runs are longer and more awkward to reach. Homes that have been through a teardown or major remodel sometimes have a mix of old and new ductwork, which adds inspection time. The size and condition of the system drives the number far more than anything else.