Service illustration · not a completed customer projectTHE WORK, EXPLAINED
Start with the condition.
Understand the scope.
EPA advises replacement when insulated duct material is wet or moldy, rather than treating it as effectively cleanable. Ask the responsible specialist to identify the affected material, moisture source and replacement boundaries. Confirm who will assess surrounding components and document any conditions that need correction before replacement.
What may be involved
- fiberglass liner
- duct board
- moisture source
- replacement scope
Ask the provider to distinguish existing parts to inspect, proposed replacements, and tools, materials or reports included in the service. Confirm the work and exclusions after assessment; this list does not mean that every item will be supplied or replaced.
LOCAL RESEARCH / San Carlos
Building history
San Carlos incorporated in 1925 during the Peninsula's early suburban-growth period.
Source ↗Local exposure
The Crystal Springs Gap can bring a summer maritime cooling effect as far as San Carlos.
Source ↗Local context
Where duct or HVAC work is permitted in California, independent field verification can be part of closing the permit. The California Energy Commission's Home Energy Rating System page says that depending on the work being done HERS testing may be mandatory and that properly permitted work will trigger any necessary testing, that a homeowner has the right to find and hire a rater who is independent of the contractor, and that suspected asbestos in duct insulation or sealing can exempt some tests, including duct leakage testing. Ask early whether the proposed scope is cleaning alone or work that would trigger verification.
Source ↗Planning your work
Duct cleaning is not usually construction work, but replacing, altering or reconnecting ductwork or air-handling equipment can be. The Contractors State License Board's consumer page on building permits sets out the California Building Standards Code position that work may not be erected, altered, repaired or demolished without a permit first obtained from the building official, and says code requirements vary between cities and counties. Ask which parts of the proposed scope are cleaning and which are alteration, then check with the building department for the address.
Source ↗Area-wide context does not establish the condition of your property or equipment.
Before the visit
Building age and weather cannot establish duct contamination. The system itself needs to be inspected.
