Air Duct Cleaning in San Francisco, CA

Why air duct cleaning is different in San Francisco

Much of San Francisco's housing stock predates 1940 — Victorians, Edwardians and 1920s–40s stucco-over-wood-frame row houses — and the Census (ACS 5-year, 2022) puts the median year built at 1945, so most homes here are older than the ducted systems that were later fitted into them. In those houses, ducts are often threaded through narrow chases, tuck-under garages and long exterior walls, where salt-laden air off the Pacific and years of settled dust collect in places nobody has opened in decades. Owner-occupancy is about 38.6 percent citywide, meaning a large share of residents are renters or live in condos and converted multi-unit buildings, especially downtown and in SoMa, where HOA rules may govern shared mechanical spaces. On the west side — Sunset, Richmond and near Ocean Beach and Sea Cliff — the same salt fog that corrodes dryer vent caps and exterior hardware keeps duct interiors damp enough that moisture problems deserve a look before the rainy season.

Problems we fix in San Francisco

• Mold and mildew from marine dampness

  Persistently high humidity in a foggy climate gives mold a foothold inside ducts, on registers and around coils. Homes in the Sunset and Richmond districts sit in the dampest air in the city for much of the year.

• Wildfire smoke residue in the system

  Regional wildfire smoke loads duct systems and filters, and fine particulate that settles inside the ductwork keeps recirculating long after the outside air clears. A cleaning plus a filter change is the practical reset after a smoke episode.

• Dust and pollen recirculation in pre-1940 homes

  Century-old wood-frame Victorians and Edwardians leak dust from wall cavities, crawlspaces and tuck-under garages straight into return paths. That debris ends up back in living spaces every time the blower runs.

• Allergy and asthma triggers

  California's spring allergy season adds pollen to ducts that already hold household dust, and a dirty blower wheel spreads it room to room. Cleaning the coil and blower matters as much as the duct runs themselves.

• Restricted airflow and higher energy use

  Buildup on coils, blowers and registers chokes airflow, so the system runs longer to deliver the same heat during San Francisco's mild but long wet winters. Restricted airflow raises energy bills and puts extra hours on the equipment.

• Post-renovation debris

  Seismic retrofit work, garage conversions and unit remodels — common in the city's older wood-frame and converted multi-unit buildings — leave drywall dust and sawdust in open ducts. That debris should be removed before the system is run at full speed.

• Neglected returns in condos and converted units

  In condo and co-op buildings, especially downtown and in SoMa, shared or hidden mechanical closets go years without attention. Registers and plenums in those units often hold the heaviest buildup.

What we do

Timing and availability

Locally, there is a fall uptick in chimney, heating and duct service before the rainy season, and repair demand across the city climbs from November through March with Pacific winter storms and atmospheric rivers. Statewide, calls also cluster during wildfire smoke episodes in late summer and fall, with a spring allergy-season bump and a round of calls when heating systems start up. Booking ahead of the wet season is the easiest way to avoid running a dirty system all winter, but you do not have to plan around it: our phones are answered 24/7 at (888) 996-7488, most areas can be scheduled same-day or next-day, and you get a free estimate before any work starts, backed by a workmanship guarantee.