Fast, Reliable HVAC Cleaning Across Los Altos
HVAC cleaning in Los Altos typically costs $280-$650 for a complete system cleaning, with most jobs completed in a single visit. We serve all Los Altos ZIP codes - 94022, 94023, and 94024 - and our technicians are usually on-site within 90 minutes of your call. Call (844) 685-6342 for upfront pricing and scheduling.
We’ve been driving to Los Altos since 1984, long before the Foothill Expressway was the corridor it is today. Our HVAC Cleaning team knows the ranch homes off Grant Road, the properties tucked against the Santa Cruz Mountains foothills, and the older neighborhoods around Old Los Altos where the same duct systems have been running since the Johnson administration. That local knowledge matters because Los Altos presents a specific problem: wildfire smoke from the hills above settles into aging ductwork in ways that standard maintenance cannot fix.
Why Bellows Air Duct & Vent Co. Is Los Altos’s Preferred HVAC Cleaning Company
Ray Castillo founded Bellows in 1984 on a simple principle - tell the homeowner the honest price before you lift a tool, then stand behind the work. That approach has built our reputation across Santa Clara County, and Los Altos homeowners specifically call us back because we don’t change the number at the door.
Our 90-Day Done Right Promise is stamped on every job. If the work is not right, we return at no charge with no paperwork required. No arguing, no runaround. We’ve honored that promise for over 42 years.
Calls are answered by a live person, 24 hours a day. Not a voicemail tree, not an app. When you call (844) 685-6342, you reach someone who can dispatch a background-checked, uniformed technician to your Los Altos home today.
We know Los Altos’s housing stock. The post-war ranches in the 94022 and 94024 ZIPs, the original sheet-metal trunk-and-branch systems, the ad-hoc flex-duct additions from the 1980s room expansions. We’ve cleaned ducts in homes near the Mountain View border and properties backing up to the foothills off Page Mill Road. That familiarity means we diagnose faster and clean more thoroughly.
Our HVAC Cleaning Services in Los Altos
Evaporator Coil Cleaning
The evaporator coil in your Los Altos home sits in a dark, humid environment - ideal conditions for microbial growth, especially when wildfire smoke particulates provide a nutrient-rich film. In our climate, with temperature inversions trapping particulates for days, coils foul faster than in coastal cities with stronger onshore flow. We access the coil, apply foaming cleaner, agitate with soft brushes, and verify cleanliness with camera inspection. A typical evaporator coil cleaning in Los Altos runs $180-$320.
Blower Cleaning
The blower motor and wheel move every cubic foot of air through your system. When smoke residue and accumulated dust coat the blades, airflow drops and energy costs rise. We’ve found blower assemblies in Old Los Altos homes so clogged that the motor was drawing 30% more amperage than specified. We remove the blower housing, clean each blade, lubricate bearings where accessible, and reassemble. Most blower cleanings in Los Altos are $150-$260.
Condenser Cleaning
Your outdoor condenser faces the Santa Clara Valley’s dust, pollen, and the fine ash that drifts down from foothill fires. We remove debris from the fins, straighten damaged coils, check refrigerant levels, and verify proper airflow. A clean condenser runs cooler and lasts longer. Condenser cleaning in Los Altos typically costs $120-$220 as a standalone service, or is bundled with full system cleaning.
Air Handler Cleaning
The air handler is the central station of your HVAC system - blower, coil, filter rack, and often the humidifier or electronic air cleaner. In Los Altos’s 1950s-1970s ranch homes, air handlers are frequently located in attics or crawl spaces that have never been properly sealed, allowing insulation particles and rodent debris to enter the return side. We clean the entire cabinet, seal accessible leaks, and document with before-and-after camera footage. Air handler cleaning in Los Altos runs $220-$380 depending on accessibility and condition.
Coil Treatment
After cleaning, we apply an EPA-approved antimicrobial treatment to evaporator and condenser coils. This is not a perfume masking odor - it’s a residual treatment that inhibits microbial regrowth for months. Given Los Altos’s smoke exposure and the valley’s humidity patterns, this step is particularly valuable. Coil treatment adds $45-$85 to a cleaning service.
Heat Exchanger Cleaning
Gas furnace heat exchangers in older Los Altos homes accumulate soot and corrosion products that reduce efficiency and can create dangerous combustion conditions. We inspect with cameras, clean accessible surfaces, and flag any cracks or deterioration for repair. This service is $160-$280 and is often combined with full system maintenance.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Los Altos
We clean and maintain systems using Honeywell, Aprilaire, and Nikro equipment - the same brands serious HVAC contractors specify for their own homes. Our Rotobrush agitation systems and HEPA vacuum extractors are built for the embedded smoke residue we find in Los Altos ductwork, not just light household dust. We stock common replacement parts locally, so if we find a failed component during cleaning, we can often complete the repair the same day rather than ordering and returning.
Common HVAC Cleaning Problems We See in Los Altos Homes
- Wildfire smoke reservoirs in aged ductwork. Los Altos sits directly at the base of the Santa Cruz Mountains foothills, making it a first-capture zone for wildfire smoke that funnels down through the hills each fall. Smoke particulates infiltrate HVAC systems and embed in ductwork in ways that standard filter changes cannot address. The fine particulates lodge in joint crevices and insulation lining, then recirculate every time the system cycles.
- Original sheet-metal systems with decades of accumulation. The dominant housing type in Los Altos’s 94022 and 94024 ZIPs is the post-war ranch home built between roughly 1952 and 1975. These homes frequently retain original trunk-and-branch duct layouts - sometimes supplemented with ad-hoc flex-duct extensions added during room additions - creating aged, patchwork systems prone to joint separation, insulation breakdown, and accumulated debris.
- High-end filtration installed on dirty ducts. Technicians working Old Los Altos neighborhoods regularly find that homeowners have added whole-house air purifiers or high-MERV filtration upgrades without ever cleaning the underlying duct system first. The new equipment simply recirculates decades of embedded debris and smoke particulates already baked into aged sheet-metal runs.
- Temperature inversion trapping particulates. The Santa Clara Valley’s persistent temperature inversions trap ground-level particulates - wildfire smoke, grass pollen from the surrounding hills, and orchard-era agricultural dust - keeping them cycling through residential HVAC systems far longer than in coastal cities with stronger onshore flow. Los Altos’s position at the valley’s western edge means duct contamination from smoke events is measurably heavier here than in flatland cities like Sunnyvale or Santa Clara a few miles east.
Pricing for HVAC Cleaning in Los Altos, CA
| Service | Typical Range in Los Altos |
|---|---|
| Full system HVAC cleaning (ducts + coils + blower) | $280-$650 |
| Evaporator coil cleaning | $180-$320 |
| Blower cleaning | $150-$260 |
| Condenser cleaning | $120-$220 |
| Air handler cleaning | $220-$380 |
| Coil treatment (antimicrobial) | $45-$85 |
| Heat exchanger cleaning | $160-$280 |
What moves the price: system accessibility (attic vs. closet), duct material condition (original sheet-metal vs. multiple flex-duct patches), and contamination level (light dust vs. heavy smoke residue). We inspect with cameras before quoting, so the number you hear is the number on the invoice. No bait coupons, no upsell at the door.
Standing offers for Los Altos homeowners: $50 off any repair over $250, free second opinion on any written estimate, $89 seasonal tune-up, and a permanent 5% senior and veteran discount.
We Also Serve Cities Near Los Altos
Our HVAC Cleaning in Los Altos service area extends to Mountain View, Sunnyvale, Cupertino, and Palo Alto. The same foothill smoke patterns affect homes throughout this corridor, and we apply the same inspection and cleaning protocols across all these communities. Response times to Mountain View and Sunnyvale are comparable to Los Altos; Cupertino and Palo Alto typically see our technicians within two hours.
Serving Los Altos, CA - Our Local Coverage Area
We’re based in the Los Altos 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 - HVAC Cleaning in Los Altos
Los Altos’s position at the base of the Santa Cruz Mountains makes it a first-capture zone for smoke that funnels down through the foothills each fall. The fine particulates embed in duct joints and insulation in ways that standard filter changes cannot remove, creating a reservoir that recirculates for months. If you smell smoke when your system first kicks on, that’s the reservoir releasing. Call (844) 685-6342 and we’ll inspect with a camera - estimates are free.
Most Los Altos homes need complete HVAC cleaning every three to five years, but homes in the 94022 and 94024 ZIPs with original ductwork and exposure to significant wildfire smoke should consider every two to three years. The Santa Clara Valley’s temperature inversions extend particulate residence time compared to coastal areas. After major smoke events - 2020’s CZU Lightning Complex fires affected this area directly - an interim inspection is prudent. Call (844) 685-6342 to schedule a camera inspection and we’ll tell you honestly whether cleaning is needed now or can wait.
Yes. We use Rotobrush agitation combined with Nikro HEPA vacuum extraction specifically designed for fine particulate removal, not just household dust. In an Old Los Altos ranch home near Grant Road, we found decades of wildfire smoke residue baked into the original sheet-metal trunk-and-branch duct system. Our Rotobrush agitation and HEPA vacuum extraction removed a thick layer of fine black particulates that the homeowner’s high-MERV air purifier had simply been recirculating. We then applied an EPA-approved antimicrobial coil treatment to prevent future microbial growth. Call (844) 685-6342 for upfront pricing on smoke-specific cleaning.
Cleaning is effective and often more necessary than in newer homes, though we inspect first to identify any ductwork that needs repair before cleaning. Original sheet-metal ducts clean well; degraded flex-duct patches may need replacement. We camera-inspect every system before quoting, so you’ll see exactly what we’re dealing with. Many 1960s Los Altos ranch homes have surprisingly durable trunk lines that just need thorough cleaning and joint sealing. Call (844) 685-6342 for a camera inspection - estimates are free.
Because the purifier cannot remove contamination already embedded in the duct walls - it only filters air passing through it. We regularly find Aprilaire and Honeywell whole-house systems installed on Los Altos ducts that have never been cleaned, meaning the purifier is simply recirculating decades of smoke residue, pollen, and debris through its expensive filters. Clean the reservoir first, then the purifier can do its job properly. Call (844) 685-6342 and we’ll show you exactly what’s in your ducts before you decide.
Ready to schedule? Call Bellows Air Duct & Vent Co. at (844) 685-6342 for a free estimate. We’ll answer with a live person, dispatch a background-checked, uniformed technician to your Los Altos home, and show you camera-verified results before and after we clean. One honest price, no changes at the door, backed by our 90-Day Done Right Promise in writing.
Written by Ray Castillo, Owner at Bellows Air Duct & Vent Co., serving Los Altos since 1984.