Air Duct Cleaning in Tamalpais-Homestead Valley, CA

Frequently Asked Questions

Our crawlspace access door is soft and rotting — repair it or replace it before duct work?

Replace it, in most cases. On the older cabins and cottages here the access hatch is usually a scrap of plywood or a frame-and-batten door that has sat against damp, shaded soil for decades, and once it's punky it won't hold a seal or a latch again. A tight, solid access door matters more in this canyon than in drier parts of Marin: it's one of the few things keeping fog-driven moisture and critters out of the under-floor space where all your ducting lives. We can usually work through a bad door to clean, but we'll tell you plainly if it needs replacing, and that's typically a carpentry fix rather than something we do as part of a cleaning.

What do you usually find wrong with ducts under homes in Homestead Valley?

Sagging and disconnected flex is the standard finding. These houses were added onto and winterized over many years, so ducting was threaded through tight under-floor space with long unsupported runs, and gravity plus time pulls the flex off the takeoffs at the plenum. We also see soaked or compressed duct wrap and standing moisture inside the boot where condensation has collected. If you're smelling must every time the heat kicks on, that smell is usually coming from wet insulation and damp liner, not from dust in the trunk line.

Will cleaning actually stop the musty smell coming out of the registers?

Sometimes, and sometimes only partly. If the odor is coming from debris and surface growth inside the metal, cleaning handles it. But in this part of the valley the crawlspace never fully dries out between the redwood shade, the fog drip, and the vented under-floor space, so the source is often wet duct wrap, an open joint pulling crawlspace air into the system, or a boot sitting in damp subfloor. We'll be direct about which it is after we look. Cleaning ducts that are still drawing in damp crawlspace air buys you a few weeks at best.

How fast can someone get out here, and can you do same day?

Same day happens, usually when we already have a crew between here and Mill Valley or Tam Valley and the afternoon opens up. It's not something to count on. The honest constraint is access: parking is tight on the narrow roads up here, several homes are on posts and piers with a hillside approach, and we'd rather schedule properly than send someone who can't stage equipment. Most jobs here get booked within a few days, and we'll give you a real window rather than an all-day one.

Why would my neighbor's bill be different from mine for the same work?

Under-floor access drives it more than square footage. A home where the crawlspace is tall enough to move through, with a nearby access hatch and ducts in reasonable shape, is straightforward. A hillside house on piers where a tech is on his belly dragging hose thirty feet, or an older cottage that was expanded two or three times and has duct branching nobody has mapped, takes substantially longer. Repairs we find along the way (reconnecting flex at the takeoffs, replacing ruined wrap) are priced separately, and we'll walk you through what's needed and what can wait before we touch anything.