Whole-system duct and dryer vent check with before-and-after photos - you see exactly what came out of your vents
That "$99 whole-house special" is a bait ad - the real number appears once they are in your hallway, or the "clean" is a shop-vac at the register. We photograph the inside of your ducts before and after instead.
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AfterFast, Reliable Air Duct Cleaning Across St. Helena
Air duct cleaning in St. Helena, CA typically runs $450-$850 for a complete residential system, with most homes in the 94574 ZIP falling in the $550-$700 range depending on duct accessibility and contamination level. We’re Morton’s Air Duct Cleaning, and we’ve been sending crews up to St. Helena from our Los Angeles dispatch office since 2005 to handle the specific problems this valley creates: vineyard sulfur residue, wildfire ash from the 2020 Glass Fire, and the crushed flex-duct runs hiding in century-old homes. Call (323) 918-4345 and a live person will pick up, day or night, to schedule your free estimate.
Why Morton’s Air Duct Cleaning Is St. Helena’s Preferred Air Duct Cleaning Company
St. Helena homeowners call us back because we treat the house like it’s our own. Our technicians arrive in uniform with shoe covers and drop cloths already on, background-checked through the Cedarwell system, and trained to work around nap schedules and anxious pets. We don’t start until you’ve seen a written price and signed off on it. Every job carries the 365-Day Done Right Promise, and every crew takes a photo of the clean-up before they leave so you can see the floors are spotless and the furniture is exactly where it was.
We’ve built a reputation in the 94574 ZIP specifically for understanding what other companies miss: the pale yellow sulfur coating inside return plenums near Spring Mountain Road and Silverado Trail, the crushed mid-century flex-duct retrofits in downtown Victorians, and the wildfire ash still embedded in systems after the Glass Fire. Our Air Duct Cleaning team uses Rotobrush agitation tools and Nikro HEPA-filtered negative-air machines, not rental shop-vacs, because St. Helena’s contamination loads demand source removal, not surface tidying.
Dispatch and scheduling are coordinated from our Los Angeles office, but the crew that arrives at your St. Helena door knows the local housing stock and the local air. Calls are answered by a live person 24/7, never a voicemail tree.
Vent Cleaning in St. Helena
Vent Cleaning in St. Helena means more than brushing off grille covers. The supply and return vents in this town’s older homes are the visible end of a system that’s often pulling sulfur-laden valley air through corroded metal seams and crushed flex runs. We remove each vent cover, clean the boot and the first few feet of duct behind it, and inspect with a camera for the damage that vineyard particulate accelerates. A typical vent cleaning in St. Helena runs $120-$220 per vent when done as part of a full system clean, or $180-$320 for standalone vent service on homes with limited access.
Supply Vent Deep Cleaning
Supply vents push conditioned air into your rooms, but in St. Helena they also push whatever’s coating the duct walls: sulfur residue, wildfire ash, and the ordinary dust that accumulates over decades in homes built before HEPA filtration existed. We seal the boot, use Rotobrush whips to dislodge material, and capture it under negative pressure so nothing drifts into the living space.
Return Vent Inspection and Restoration
Return vents are where your system breathes in, and in St. Helena they’re where the valley’s trapped particulate enters first. We check the filter housing, the plenum behind the grille, and the first turn of ductwork for the yellowish sulfur film our techs regularly find near vineyard blocks. If the metal is corroded, we document it and quote sealing or repair before any cosmetic cleaning begins.
Air Duct Repair in St. Helena
Air Duct Repair in St. Helena addresses problems that cleaning alone won’t fix: corroded seams leaking sulfur-tainted air into wall cavities, crushed flex-duct runs from mid-century retrofits that no longer feed the rooms they’re supposed to, and disconnected boots spilling conditioned air into attics or crawl spaces. Repair work here typically runs $280-$550 for sealing and minor reconstruction, or $650-$1,200 when we’re replacing crushed or disconnected runs in homes with original plaster and lath that demands careful access. We always camera-inspect first so you’re not paying for work you don’t need.
Corroded Seam Sealing
Vineyard sulfur dust is mildly acidic. Over seasons of accumulation, it attacks the galvanized seams in metal ductwork, creating pinhole leaks that whistle, waste energy, and pull attic air into your supply. We clean the seam to bare metal, apply Guardsman mastic rated for HVAC use, and reinforce with mesh where the corrosion has pitted the surface.
Crushed Run Replacement
The flex-duct retrofits installed in St. Helena’s Victorians and Craftsmans during the 1960s and 70s were sized for the heating loads of that era, not for the particulate loads of modern valley agriculture. They’re often crushed by decades of compression, kinked at turns too tight for the diameter, or simply disconnected at the collar. We replace with properly sized, insulated flex or rigid duct where access allows, supported correctly so the crush doesn’t repeat.
Trusted Brands We Service in St. Helena
We carry equipment and parts from Rotobrush, Nikro, Aprilaire, and Guardsman on every St. Helena truck, which means most repairs don’t wait for a parts run back to the warehouse. Our Rotobrush machines handle the agitation work in older duct systems without damaging original materials, while Nikro HEPA-filtered negative-air units capture the fine sulfur and ash particulate that standard vacuums recirculate. For filtration upgrades after a deep clean, we stock Aprilaire media cabinets and Guardsman sealants rated for the temperature swings these valley systems experience. If your home has an existing Honeywell or Abatement Technologies component, we service those too, and we’ll tell you honestly whether it’s worth keeping or replacing.
Common Air Duct Cleaning Problems We See in St. Helena Homes
- Sulfur residue corrosion in return plenums. The pale yellow film our techs find near vineyard-adjacent homes on Spring Mountain Road and Silverado Trail isn’t ordinary dust. It’s elemental sulfur from powdery-mildew spraying, and it corrodes metal duct seams over time, creating leaks that standard cleaning ignores.
- Wildfire ash embedded from the 2020 Glass Fire. The fire burned through the Mayacamas hills directly above St. Helena, and the smoke particulate that entered homes during those weeks is still trapped in duct insulation and porous plaster. Surface vacuuming doesn’t remove it; source removal with HEPA filtration does.
- Crushed mid-century flex-duct retrofits. The late-Victorian and Craftsman homes in St. Helena’s residential core often have forced-air systems retrofitted in the 1950s-1970s with undersized flex duct that’s now compressed, kinked, or disconnected, starving rear bedrooms of airflow while the system works harder.
- Temperature inversion trapping particulate. St. Helena’s enclosed valley between the Mayacamas and Vaca ranges holds sulfur dust, harvest chaff, and smoke at ground level longer than open terrain, so ducts here accumulate contaminant faster than in flatland Napa, requiring more thorough cleaning cycles.
Pricing for Air Duct Cleaning in St. Helena, CA
Most complete residential air duct cleaning jobs in St. Helena fall between $450 and $850, with the typical 2,000-3,000 square foot home running $550-$700. Whole-system cleaning with video inspection, HEPA-filtered source removal, and vent-by-vent documentation starts around $650 and tops out near $950 for homes with extensive corrosion repair or multiple crushed runs to replace. Commercial duct cleaning for St. Helena’s tasting rooms and hospitality spaces runs $1,200-$2,800 depending on system complexity.
What moves the number: accessibility (crawl space vs. basement), contamination level (sulfur residue and wildfire ash require more agitation time), and whether we find damage that needs repair before cleaning is worthwhile. We give you one flat price per system, agreed in writing before any work starts. No per-vent add-ons, no surprise charges once the truck is in your driveway. Estimates are free, and we bring a camera so you see what we see.
We Also Serve Cities Near St. Helena
Morton’s dispatches crews throughout California from our Los Angeles office, including regular routes to St. Helena and surrounding metro areas. We also provide air duct cleaning in Los Angeles, San Diego, San Jose, and San Francisco with the same written-upfront pricing and 365-Day Done Right Promise on every job.
Serving St. Helena, CA - Our Local Coverage Area
We’re based in the St. Helena area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About Air Duct Cleaning in St. Helena
It’s elemental sulfur from vineyard powdery-mildew spraying, a standard agricultural practice in Napa Valley that doesn’t occur in non-wine-country cities. The sulfur drifts on valley breezes, enters your return vents, and accumulates as a pale yellow film that corrodes metal ductwork over time. We remove it with agitation tools under HEPA-filtered negative pressure, then seal affected seams with Guardsman mastic. Call (323) 918-4345 for a free inspection and exact quote.
Yes. The fire burned through the Mayacamas hills directly flanking St. Helena, and smoke particulate entered thousands of homes during the event. That ash is still embedded in duct insulation, porous plaster, and filter media, and it requires source-removal cleaning with HEPA filtration rather than standard vacuuming. We document wildfire contamination with camera inspection before quoting removal.
St. Helena sits deeper in the narrow valley heart, where temperature inversions between the Mayacamas and Vaca ranges trap sulfur dust, harvest chaff, and smoke particulate at ground level far longer than in Napa’s more open southern terrain. Ducts here accumulate contaminant faster, and the town’s concentration of 1880s-1920s homes with mid-century retrofits creates unique access and material challenges. Our St. Helena crews carry specific experience with these housing stock and contamination combinations.
We regularly find crushed or disconnected flex-duct runs from 1960s-70s retrofits, sulfur-corroded seams in original metal ductwork, and wildfire ash layered with ordinary household dust in homes built before modern filtration. On Spring Mountain Road, our tech opened a return-air plenum in an 1890s Victorian with a mid-century flex-duct retrofit and found the interior coated in pale yellow sulfur residue that had corroded the seams, plus a crushed run feeding the rear bedrooms. We ran camera inspection to map the disconnects, used agitation tools under negative pressure with HEPA filtration to remove the source material, and sealed the compromised joints with Guardsman mastic before reconnecting the run. The homeowner reported the sulfur odor at the return grille was gone within a day.
We clean to bare metal, assess pitting depth with camera inspection, then seal with Guardsman mastic rated for HVAC temperature cycling. Where corrosion has penetrated the metal, we section in new material rather than patching over weakness. The repair is quoted upfront, photographed before and after, and covered by our 365-Day Done Right Promise. Call (323) 918-4345 to schedule an inspection.
Ready to see what’s actually inside your ducts? Call (323) 918-4345 for a free estimate. A live person will answer, schedule a time that works around your household’s routine, and send a uniformed crew who’ll protect your floors, work quietly if there’s a nap in progress, and leave a written price and a photo of the clean-up before they go.
Written by Paul Adeyemi, Owner at Morton’s Air Duct Cleaning, serving St. Helena since 2005.