Fast, Reliable HVAC Cleaning Across Seattle
HVAC cleaning in Seattle typically runs $280-$580 for a full system service, with most jobs completed in a single visit by our HVAC Cleaning team. We answer calls from Seattle homeowners 24 hours a day, and our technicians are usually on-site within hours, not days.
We’ve worked in Seattle homes since 2012, from the Craftsman bungalows of Capitol Hill to the mid-century ramblers climbing Beacon Hill’s slopes. Seattle’s damp marine climate creates contamination patterns you won’t find in drier markets, and we’ve built our protocols around them. Our crew knows the difference between a gravity-furnace retrofit in a 1920s foursquare and a modern heat pump in a new Ballard build, and we price accordingly - one honest number, shown before we start.
Call (833) 700-5198 for a free estimate. We’ll be there when we say.
Why Bellows Air Duct & Vent Co. of Seattle Is Seattle’s Preferred HVAC Cleaning Company
Bellows has cleaned ductwork in Seattle for over 42 years. Colin Merritt leads our operation, and our reputation here was built on jobs done right the first time - backed in writing for 90 days, no paperwork, no arguing.
Seattle homeowners call us because we’ve seen what this climate does to ductwork. Our reviews consistently mention the camera inspection: customers watch the before-and-after footage on-site, so there’s no question whether the job was thorough. Our technicians are background-checked, uniformed, and equipped with Rotobrush agitation systems and Abatement Technologies HEPA containment - the same gear specified by serious HVAC contractors.
Response time matters in Seattle’s wet seasons. We keep crews positioned to reach Capitol Hill, Ballard, Columbia City, and Rainier Valley quickly. Calls are answered by a live person, 24/7 - not a voicemail, not an app. If the work’s not right, we return at no charge. That’s the 90-Day Done Right Promise, and it’s stamped on every job.
Our HVAC Cleaning Services in Seattle
Evaporator Coil Cleaning
Seattle’s heat pump installations have surged in the last decade, but most coils we inspect are coated with a layer of biofilm that thick, wet air deposits year-round. A dirty evaporator coil cuts efficiency by 15-30% and becomes a breeding ground for mold. In Seattle’s humidity, that biofilm regenerates fast. We remove the coil assembly when accessible, clean with foaming agents safe for aluminum and copper, and verify airflow recovery with digital manometers. Coil cleaning alone typically runs $180-$320 in the Seattle market.
Coil Treatment
After cleaning, we apply an EPA-registered biocide treatment that inhibits mold regrowth for the cooling season. This step is non-negotiable in Seattle’s marine climate, where coils stay wet for months. The treatment adds $65-$95 to a coil cleaning but prevents the musty startup smell that plagues Seattle heat pumps every spring. We stand behind it - if mold returns within 90 days, we retreat at no charge.
Air Handler Cleaning
The air handler is where Seattle’s moisture problems concentrate. Blower wheels cake with dust that absorbs humidity, throwing off balance and drawing excess amperage. Cabinet interiors rust. Drain pans clog with algae. Our air handler service includes blower removal and cleaning, cabinet sanitization, drain line clearing, and motor amp draw verification. For Seattle’s older homes with retrofitted ductwork, this is often the most impactful single service we perform. Expect $240-$420 depending on accessibility and contamination level.
Blower Cleaning
A blower wheel coated in debris doesn’t move rated CFM. In Seattle’s tight, energy-efficient homes, that means longer run times, higher bills, and uneven temperatures. We pull the blower assembly, clean vanes and housing with compressed air and contact cleaners, and reinstall with verified torque on set screws. Most blower cleanings are completed in under two hours.
Condenser Cleaning
Seattle’s mild summers mean condensers don’t work as hard as in Phoenix or Atlanta, but they still collect cottonwood fluff, fir needles, and the fine particulate from wildfire smoke events that settle in the Puget Sound basin. We fin-comb damaged coils, apply foaming cleaner, and verify refrigerant pressures. A clean condenser in Seattle’s moderate climate can recover 10-15% efficiency - meaningful over a heating-dominant year.
Heat Exchanger Cleaning
Older Seattle homes with converted oil-to-gas furnaces often have heat exchangers fouled with decades of soot and corrosion products. We inspect with borescope cameras, clean accessible surfaces without compromising metal integrity, and document condition for the homeowner. If we find cracks or failures, we flag them immediately - safety first, always.
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.
- 4
You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Seattle
We specify professional-grade equipment from Rotobrush, Nikro, and Abatement Technologies - brands that HVAC contractors in Seattle trust for their own jobs. Our vans stock HEPA filtration media, biocide treatments, and common repair parts so we’re not waiting on supply house runs. For coil treatments, we use EPA-registered products compatible with Honeywell and Aprilaire air quality systems. Fast turnaround matters to Seattle homeowners, and keeping the right gear on hand is how we deliver it.
Common HVAC Cleaning Problems We See in Seattle Homes
- Mold and biofilm in retrofitted crawl-space ductwork. Seattle’s pre-2000 homes, often retrofitted with ductwork in damp crawl spaces, trap moisture and mold from the region’s 75%+ average humidity, creating contamination profiles unseen in drier climates. The flex-duct splices common in these retrofits become reservoirs for spore colonies.
- Embedded wildfire particulate from smoke season. The Puget Sound basin’s topography traps Cascade and Eastern Washington wildfire smoke for days at a time. Standard vacuum-only cleaning misses PM2.5 particles that embed in duct lining; they require HEPA agitation protocols we developed specifically for Seattle’s smoke events.
- Rodent debris in oil-to-gas conversion systems. Techs working Rainier Valley, Beacon Hill, and Seward Park frequently pull ductwork from original oil-to-gas-converted systems where flex-duct connections into crawl spaces have collected both mold and rodent nesting material in the same run - a combination rare in drier markets but predictable here.
- Rust and corrosion from ground moisture vapor intrusion. Seattle’s glacial soils hold water persistently. Ductwork sitting on or near crawl-space dirt draws that moisture through vapor transmission, accelerating metal degradation and creating conditions where bacteria thrive on oxidized surfaces.
Pricing for HVAC Cleaning in Seattle, WA
Here’s what HVAC cleaning costs in Seattle’s current market:
| Service | Typical Range |
|---|---|
| Full system HVAC cleaning (ducts + air handler) | $280-$580 |
| Evaporator coil cleaning | $180-$320 |
| Coil treatment (biocide application) | $65-$95 |
| Air handler cleaning | $240-$420 |
| Blower cleaning only | $140-$220 |
| Condenser cleaning | $120-$195 |
| Heat exchanger inspection + cleaning | $160-$280 |
Factors that move the price: accessibility of crawl-space ductwork, severity of biological contamination, whether HEPA containment is required for mold remediation, and the number of supply/return registers. We disclose the full price before lifting a single tool - no bait coupons, no changes at the door. Our $89 Seasonal Tune-Up is available year-round for Seattle homeowners who want preventive maintenance. Call (833) 700-5198 for your exact quote; estimates are free.
We Also Serve Cities Near Seattle
Our crews work throughout the metro area, including Seattle and the surrounding communities of White Center, Mercer Island, Bellevue, and Kirkland. The same technicians, the same equipment, the same upfront pricing - whether your home is on Capitol Hill or the Eastside slopes.
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 average relative humidity stays above 75% most of the year, and ductwork in unencapsulated crawl spaces sits directly on wet glacial soils. Moisture feeds mold and biofilm that dry climates simply don’t produce at the same rate. Without an annual cooling cycle to dry duct interiors - most Seattle homes ran heat-only for decades - that moisture accumulates. We recommend cleaning every 3-5 years here versus 5-7 in arid markets. Call (833) 700-5198 to schedule; estimates are free.
Wildfire smoke deposits fine particulate matter (PM2.5) that embeds in duct lining and remains airborne during heating season. The Puget Sound basin traps smoke for days, loading ducts far beyond normal dust accumulation. Standard cleaning won’t remove it; we use HEPA agitation protocols developed after the 2020 and 2022 smoke seasons. If you smelled smoke inside your home during an event, your ducts likely retained particulate. Call for camera inspection - we’ll show you exactly what’s in there.
Seattle’s dominant housing stock - pre-WWII Craftsman bungalows and 1950s-1970s ramblers - was built without central forced-air. Ductwork was added later, often with more joints, flex-duct splices, and irregular runs than purpose-built systems. These retrofits pull contamination from crawl spaces and are harder to seal and clean thoroughly. Last spring, we cleaned a 1920s Craftsman on Capitol Hill where the gravity furnace retrofit flex-duct in the crawl space had spliced joints packed with rodent debris and active mold colonies; we used Rotobrush agitation with Abatement Technologies HEPA filtration and an EPA-registered biocide treatment to remediate the biological load before the owners’ spring allergy season began. Older homes need experienced crews - not discount operators working fast.
Yes - especially with a heat pump. Your coil runs in cooling mode during summer and in reverse as the evaporator during heating defrost cycles. Seattle’s wet air keeps it perpetually damp, accelerating biofilm growth. A dirty coil on a heat pump costs more to operate year-round than on a gas furnace with intermittent cooling. Coil cleaning every 2-3 years is standard maintenance for Seattle heat pump owners. Call (833) 700-5198 for pricing on your system.
Yes, but the source matters. If the smell comes from ductwork drawing crawl-space air through leaks, cleaning alone won’t solve it - we need to seal the ductwork or encapsulate the crawl space. If mold is growing inside the ducts from moisture infiltration, cleaning with biocide treatment eliminates the odor at its source. We camera-inspect first to determine which scenario applies. Either way, we’ll give you a straight answer and a single price before starting. Call for a free estimate.
Ready to get your Seattle home’s HVAC system cleaned right? Call Bellows Air Duct & Vent Co. at (833) 700-5198. We’ll answer live, schedule promptly, and show up with the right equipment for whatever your ducts and coils have accumulated. One honest price, camera-verified results, and our 90-Day Done Right Promise in writing - that’s the square deal we’ve offered Seattle homeowners since 2012.
Written by Colin Merritt, Owner at Bellows Air Duct & Vent Co., serving Seattle since 2012.