Fast, Reliable HVAC Cleaning Across Seattle
HVAC cleaning in Seattle typically runs $280-$650 for a full system service, with most jobs completed in a single visit by our HVAC Cleaning team. We answer calls live 24 hours a day, and we dispatch to Seattle neighborhoods from Ballard to Beacon Hill with same-day availability when you call before noon.
We’ve worked on Seattle homes for over 42 years. We know the 1910s Craftsman bungalows in Ballard (98107) with their retrofit flex-duct squeezed through crawl spaces. We know the hillside lots on Queen Anne (98109) where duct runs drop 20 feet through damp soil air. And we know the post-2021 heat pump installations that added a new layer of ductwork to houses that never had it before. This city isn’t like Phoenix or Denver. The marine west coast climate here keeps indoor humidity at 75-85% year-round, even when it’s not raining. That means mold, not dust, is usually the problem we’re solving.
Call (844) 685-6342 for upfront pricing and a free estimate. The number we give on the phone is the number on the invoice.
Why Bellows Air Duct & Vent Co. Is Seattle’s Preferred HVAC Cleaning Company
Seattle homeowners have called us back for decades because we show them the problem before we quote the fix. Every job starts with a camera inspection of your ductwork, and we review the footage with you on-site. No scare tactics. No bait coupons that triple at the door. One honest price, shown before we start.
Our technicians are background-checked and uniformed, and they answer to a live person at our office 24/7. Not a voicemail tree. Not an app. If something isn’t right after we leave, our 90-Day Done Right Promise means we return at no charge with no paperwork required. Ray Castillo, who leads Bellows, has kept that promise since 1984.
We respond to Seattle calls with same-day scheduling when possible, and we carry parts and equipment for most brands on our trucks. That matters in a city where hillside access and narrow streets can turn a two-hour job into a full-day ordeal with the wrong preparation.
Our reviews from Seattle customers mention the same things repeatedly: we show up when we say, we explain what we found, and we don’t invent problems. That’s the square deal we’ve built our name on.
Our HVAC Cleaning Services in Seattle
Air Handler Cleaning
Air handlers in Seattle take a beating that dry-climate units never see. The constant high humidity means blower motors, housings, and drain pans accumulate biological growth, not just household dust. In Capitol Hill’s 1920s apartment conversions and Beacon Hill’s hillside homes, we find air handlers installed in basement utility closets or garage alcoves where ventilation is poor and moisture pools. We disassemble the housing, clean the blower wheel and motor housing with HEPA-contained vacuums, and treat the drain pan with EPA-registered biocide to prevent algae and mold from clogging the condensate line. A clean air handler moves air more efficiently and doesn’t recirculate musty odors through your registers.
Coil Treatment
Seattle’s evaporator coils run wet for months at a time. The combination of cool refrigerant and humid air creates a biofilm layer that standard cleaning can’t touch. We apply a foaming treatment that penetrates the coil fins, followed by a low-pressure rinse that won’t bend the delicate aluminum. For homes in Fremont and Ballard with original 1950s duct retrofits, we often find coils that have never been properly treated, the fins clogged with a decade of microbial growth that reduces airflow by 30% or more. Coil treatment is included in our full-system clean, or available as a standalone service for $180-$290.
Blower Cleaning
The blower motor and wheel are the heart of your airflow. In Seattle’s older homes, particularly the Craftsman bungalows with retrofit ductwork, blowers work harder to push air through poorly designed runs with excessive static pressure. That extra load draws more debris into the housing and overheats the motor. We remove the blower assembly, clean the wheel blade by blade, and inspect the motor bearings for wear. On a job in a 1926 Craftsman on 15th Ave E in Capitol Hill (98102), we found the retrofitted flex-duct supply run to the second floor was routed through an uninsulated crawl space that had been collecting damp soil air for decades. The fiberglass liner was black with Stachybotrys mold, and the blower motor was caked with debris. We used a Rotobrush with a HEPA vac and applied an Abatement Technologies EPA-registered biocide, then sealed a gap at the crawl space penetration that was pulling in 80% humidity air.
Evaporator Coil Cleaning
Located in the plenum above your furnace or inside your air handler, the evaporator coil is where Seattle’s humidity problem becomes visible. We access the coil through the proper panels, never by cutting sheet metal, and document the before condition with our camera system. A typical evaporator coil cleaning in Seattle runs $220-$380 depending on accessibility and contamination level.
Condenser Cleaning
Your outdoor condenser coil faces Seattle’s unique challenge: not heat, but organic debris. The city’s dense tree canopy, particularly in neighborhoods like Ravenna and Laurelhurst, means cottonwood fluff, maple seeds, and moss clog the fins. We clean condenser coils with foaming agent and low-pressure water, straightening any bent fins with a comb tool. Condenser cleaning alone typically costs $150-$240 in the Seattle market.
Heat Exchanger Cleaning
Gas furnaces in Seattle’s older homes, particularly pre-WWII models still running in Wallingford and Green Lake, require careful heat exchanger inspection. We use borescope cameras to check for cracks or corrosion that could allow carbon monoxide into your living space. Cleaning is performed with soft brushes and vacuum extraction, never compressed air that could force debris deeper. If we find heat exchanger damage, we’ll show you the footage and explain your options clearly.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
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 Seattle
We stock parts and maintain equipment from Rotobrush, Abatement Technologies, and Aprilaire, the same brands that serious HVAC contractors specify for Pacific Northwest conditions. Rotobrush systems handle the mechanical agitation that Seattle’s mold-contaminated ductwork requires. Abatement Technologies supplies the HEPA containment and EPA-registered biocides we use after every cleaning where biological growth is present. Aprilaire humidifier and air cleaner components are common in Seattle homes, and we carry replacement media and UV lamps on our trucks. That means most Seattle jobs are completed in a single visit, not stretched across multiple appointments while parts ship from out of state.
Common HVAC Cleaning Problems We See in Seattle Homes
- Mold recontamination after incomplete sealing. Homeowners assume duct cleaning alone solves mold, but without sealing crawl space penetrations in hillside homes like those on Beacon Hill, recontamination occurs within weeks. We find and seal the entry points, not just treat the symptoms.
- Condensate drip from uninsulated attic ducts. In Ballard’s 1910s bungalows, retrofit ductwork frequently has uninsulated metal sections in vented attics, causing condensate drip that soaks insulation and breeds Aspergillus, which standard cleaning protocols miss. We insulate after we clean.
- DIY biofilm failure. DIY duct cleaning using shop vacs and store-bought biocides fails to remove biofilm from fiberglass-lined ducts common in 1950s retrofits, leading to recurring musty odors and respiratory irritation. Mechanical agitation plus professional biocide application is the only reliable method.
- Fire risk from knob-and-tube proximity. Seattle’s balloon-frame Craftsman bungalows often have retrofit ductwork that shares wall cavities with original knob-and-tube wiring; the heat from blower motors can degrade old insulation, creating a fire risk that is rare in cities with newer homes. We flag this condition during camera inspection and recommend licensed electrical evaluation when we find it.
Pricing for HVAC Cleaning in Seattle, WA
Here’s what HVAC cleaning costs in the Seattle market:
| Service | Typical Range |
|---|---|
| Full system HVAC cleaning (air handler, coils, blower, ductwork) | $420-$650 |
| Air handler cleaning only | $240-$360 |
| Blower cleaning and motor service | $180-$290 |
| Evaporator coil cleaning | $220-$380 |
| Condenser coil cleaning | $150-$240 |
| Coil treatment with biocide | $180-$290 |
| Heat exchanger inspection and cleaning | $200-$320 |
Factors that affect your price: accessibility of components in basement or attic installations, severity of biological contamination requiring extended biocide dwell time, need for crawl space sealing or duct repair, and whether your system uses standard or hard-to-source filter sizes. We disclose the full price before we lift a single tool. Our $89 Seasonal Tune-Up is available for systems that need inspection and light maintenance rather than full cleaning. Seniors and veterans receive a permanent 5% discount. Call (844) 685-6342 for your exact quote, estimates are free.
We Also Serve Cities Near Seattle
Our service area extends to Bellevue, Kirkland, Shoreline, and Redmond. We dispatch from the same fleet that covers Seattle, with the same equipment and the same upfront pricing policy. Whether you’re in a Kirkland lakeside home with its own humidity challenges or a Bellevue mid-century modern with original ductwork, we apply the same camera-verified, 90-day guaranteed standard.
Serving Seattle, WA - Our Local Coverage Area
We’re based in the Seattle 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 Seattle
Seattle’s year-round indoor humidity of 75-85% allows mold spores to colonize duct interiors within months, particularly in fiberglass-lined supply ducts; Phoenix’s dry climate means dust and dander are the primary concerns, and biocide is rarely necessary. We apply EPA-registered biocide after mechanical cleaning on most Seattle jobs. Call (844) 685-6342 and we’ll explain whether your system needs it.
Yes, we remove and hand-clean cast iron or steel floor registers with soft brushes and low-pressure extraction, never forcing tools through fragile louvers; we document their condition before we start and note any that need stabilization. Many Ballard and Fremont homes have registers that are nearly a century old, and we treat them accordingly. Call for a free estimate.
Running a contaminated system circulates spores through every room and can aggravate respiratory conditions, particularly for children or elderly residents; we recommend scheduling cleaning before continuous heating season use. If you smell musty odors when the blower activates, that’s a clear indicator to call. We’ll inspect with our camera system and give you a straightforward assessment, no charge for the estimate.
We prefer you to be present for the initial camera inspection so we can show you what we found and confirm the scope before we begin; most Seattle jobs take 3-5 hours, and you can step out after the walkthrough if needed. We’ll call before we arrive and again when we’re done. Call (844) 685-6342 to schedule at your convenience.
Every 3-5 years for standard maintenance, but every 2-3 years if your home has retrofit ductwork through vented crawl spaces, you’ve had water intrusion, or occupants have allergies or respiratory sensitivity; the 2021 heat dome also pushed many Seattle homeowners to install ducted heat pumps in homes never designed for forced air, and those new systems warrant earlier inspection for sealing and moisture issues. We offer free reminders and seasonal scheduling. Call to set up your first inspection.
Ready to get your Seattle home’s HVAC system cleaned right? Call Bellows Air Duct & Vent Co. at (844) 685-6342 for a free estimate with upfront pricing. We’ll show you what we find, explain what it means, and stand behind our work for 90 days with no paperwork and no arguing. That’s the square deal we’ve delivered since 1984.
Written by Ray Castillo, Owner at Bellows Air Duct & Vent Co., serving Seattle since 1984.