Question 1

My return air smells musty every time the heat kicks on — is that the ducts?

Accepted Answer

Usually, yes, and it's the most common call we get here. Most of these postwar hillside homes run sheet metal and flex through an under-floor crawlspace. With fog sitting in most of the summer day and ground moisture that never dries out, the inside of that ductwork stays damp. Dust settles on the metal, holds the moisture, and you get mold growth on the dust film rather than on the duct itself. The smell shows up when the furnace runs because air is being pulled across all of it. Cleaning the system removes the food source. If the crawlspace itself is wet or the duct insulation is saturated, we'll tell you that part is a repair issue, not a cleaning one.

Question 2

We still have the original wall furnace. Is there anything to clean?

Accepted Answer

Sometimes not much, and we'd rather say so up front. A wall or floor furnace with no duct run is a single grille and a heat exchanger. There's no duct system to clean, and anyone who quotes you a full duct cleaning on one isn't being straight with you. Plenty of untouched homes around the older Grand Avenue blocks are still set up that way. If part of the house was added onto later and a small ducted system was put in for those rooms, that portion is worth cleaning. We'll look first and tell you which situation you're in.

Question 3

What makes the price higher or lower on a house like mine?

Accepted Answer

A few things drive it in South San Francisco. How many supply and return drops there are matters: the compact tract floor plans up on the hills tend to have fewer runs than a large home, which works in your favor. Crawlspace access and condition matter too: tight under-floor clearance, standing damp, or old flex that has sagged into low spots all slow the work down. Whether there's visible mold growth on the dust inside the trunk also factors in, since that means more than a straight vacuum-out. A single-system tract home with a reachable crawlspace sits at the low end of what we do. A hillside house with a long awkward under-floor run and heavy buildup costs more because it takes longer.

Question 4

How fast can you get out here?

Accepted Answer

Typically within a few days for a standard booking. Fall is our heaviest stretch locally because people fire up heat for the first time, smell the summer's worth of damp in the ducts, and call all at once. Expect a slightly longer wait then. Parking is the other variable. On the tighter blocks where houses sit close together with little lot spacing, we need somewhere realistic to put the truck and run hose, so it helps if you can tell us what the street is like when you book.

Question 5

Can you come the same day?

Accepted Answer

Sometimes, usually when a crew finishes early elsewhere on the Peninsula. Ask rather than assume. Same-day is more likely midweek than on a Saturday. One thing we won't do is rush a crawlspace job to fit a same-day slot. If we get under your floor and find wet insulation or duct that's come apart at a joint, that needs to be documented properly, and squeezing it into the end of a day doesn't serve you. If we can't get there today, we'll give you a real window rather than a maybe.

Air Duct Cleaning in South San Francisco, CA

Duct cleaning in South San Francisco

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Air Duct Cleaning services in South San Francisco

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