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.
Before
After
Before
After
Before
AfterLennox Air Duct Cleaning in Seattle, CA | Hollis Air Duct Cleaning
We provide independent Lennox Air Duct Cleaning - Seattle, and the short answer is this: most Lennox systems here are not dirty the way homeowners expect. They’re wet. Seattle’s hybrid HVAC setups, where a Lennox heat pump gets spliced onto ductwork sized for an old gas furnace, create condensation and mold conditions that dry-climate duct cleaners never see. Hollis Air Duct Cleaning has worked on Lennox systems since the original Pulse furnace days, and we’re not affiliated with Lennox. We’re an independent Seattle crew that specializes in diagnosing the moisture and airflow problems that come with Lennox equipment in this city. Call (361) 326-5060 and we’ll tell you what’s actually going on inside your ducts.
Why Seattle Residents Choose Us for Lennox Service
Lennox is not one machine. We handle the Lennox sales & service landscape daily, from Dave Lennox Signature Collection furnaces like the SL280V and SLP98V to Merit Series ML180s and Elite Series EL296Vs with their variable-speed blowers. Roy Castellanos, our owner, grew up in Boyle Heights and trained through the sheet metal and air conditioning program at Los Angeles Trade-Technical College, then spent years running duct work by hand before founding Hollis. That background matters here because Lennox equipment behaves differently in Seattle’s climate, and knowing the equipment means knowing where condensation forms, where flex duct sags, and where a small moisture issue turns into a mold problem. We are the Seattle service area crew you want when the problem is not dust. It’s moisture management and system compatibility, and that’s our whole focus.
Common Lennox Air Duct Cleaning Problems We Solve in Seattle
- Variable-speed blowers creating condensation in supply ducts. Lennox Signature and Elite furnaces with variable-speed blowers often run at lower airflow on heat pump mode. In Seattle’s humidity, that slower air sits long enough to condense inside supply ducts and trigger microbial growth on the interior liner. We clean the liner and correct the airflow issue that caused it.
- Merit Series coils turning into wet mats in damp crawlspaces. Lennox Merit coils, especially those paired with older gas furnaces, collect dust. In a Seattle crawlspace, that dust absorbs moisture and becomes a wet mat that restricts airflow and forces longer run cycles. We clean the coil and the surrounding duct run so the system stops working against itself.
- Sagging flex duct holding standing water. Original Lennox flex duct installed in the 1990s and 2000s sags in Seattle’s wet crawlspaces. Standing water collects at the low points, and that’s the source of the musty odor homeowners describe. We replace the failed flex runs and seal the connections.
- Undersized return ducts pulling humid crawlspace air. Many Lennox heat pump systems in Seattle were matched to existing return ducts sized for gas furnaces. The pressure imbalance pulls humid crawlspace air into the living space, which carries mold spores and that damp smell. We map the pressure differences and seal the return path.
- Blower wheels caked with biofilm. Constant moisture plus dust produces biofilm on the blower wheel. A blower wheel in this condition moves less air, runs hotter, and circulates the smell through every room. We pull and clean the blower assembly as part of a full system cleaning.
Lennox Service in Seattle: What Local Conditions Mean for Your Equipment
Seattle’s building code and energy incentive programs have pushed a lot of homeowners to add Lennox ducted heat pumps onto existing gas furnace ductwork. That’s a sensible efficiency move on paper, but those ducts were never sized for the cooler, more humid air a heat pump moves. What happens next is predictable if you know what to look for: condensation collects at low points, drain pans overflow into the duct lining, and pressure imbalances pull damp crawlspace air into the return. Our cleaning work in Seattle therefore includes moisture mapping and drain-pan checks that would be pointless in, say, Phoenix. We also offer our Dryer Vent Cleaning in Seattle for homes with moisture-related venting issues. In a 1920s Craftsman bungalow in Seattle’s Wallingford neighborhood, we inspected a Lennox EL296V furnace paired with 15-year-old flex duct in a damp crawlspace. The supply ducts sagged and held standing water. The blower wheel was caked with biofilm. We performed a full system cleaning, replaced the wet flex runs, and sealed the plenum with mastic. The odor disappeared and airflow returned to normal. That is the kind of job generic duct cleaning does not address, because generic duct cleaning is not looking for moisture. We are.
Lennox Models & Products We Service in Seattle
We work on the full Lennox furnace and heat pump range: Dave Lennox Signature Collection SL280V and SLP98V furnaces with matching coils, Merit Series ML180 and ML193 furnaces, Elite Series EL296V and EL180 furnaces, and XC21 and XC25 air conditioners. For ducted heat pumps, we service XP25 and XP21 units paired with existing furnace ductwork. When a critical part needs replacing, like a blower motor or coil, we source OEM Lennox-compatible components when available. For duct sealing and insulation, we use aftermarket materials that meet or exceed OEM specs, because the goal is a sealed duct system, not a brand label on the mastic. If your Lennox system is over 15 years old with major duct contamination plus refrigerant leaks, we will give you a straight assessment on whether cleaning is worth it or whether replacing the ductwork is the honest move.
Lennox Service Pricing in Seattle
Let’s talk numbers. A full Lennox duct cleaning in Seattle typically runs between $450 and $850 for a standard single-family home, depending on the number of returns, the length of the duct runs, and whether we’re dealing with moisture damage or replacing flex sections. Video inspection adds $99 to $149. Duct sealing with mastic runs $300 to $600 depending on accessibility. If you have a hybrid heat pump setup with moisture mapping and drain-pan work, expect the higher end of the range. Every job gets a written price before we touch anything, and that price does not move at the door. Hollis has operated since 2004 under The Garrison Standard: arrive inside the window, price in writing, do the job by the book, leave the site clean. Call (361) 326-5060 for a free estimate and we’ll give you the number up front.
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 – Lennox Air Duct Cleaning in Seattle
Yes, it’s the single most common problem we see in Seattle homes with Lennox heat pumps. Old furnace ducts are sized for hot, dry air moving fast. A heat pump moves cooler, more humid air at lower velocity, which means condensation forms inside the ducts, especially in crawlspaces and attics. That moisture feeds mold. Cleaning the ducts helps, but the real fix is airflow correction and sealing the return path. Call (361) 326-5060 and we’ll map what’s happening in your system.
For most Seattle homes, every 3 to 5 years. Homes with crawlspaces, hybrid heat pump retrofits, or a history of musty odors may need it more often. Seattle’s 150-plus rainy days per year mean moisture never really leaves the equation, and that shortens the interval compared to drier cities. We can tell you after one inspection what schedule makes sense for your house.
In most cases, yes. We use negative-air machines and coil cleaning tools designed for in-place work on Lennox Signature systems. If the coil is heavily caked or buried behind cramped ductwork in a Seattle basement, removal may be necessary to do the job right. We’ll show you photos before and after, either way.
Almost always it’s standing water in sagging flex duct or microbial growth on the coil and duct liner. Seattle’s damp crawlspaces are the prime suspect. The smell moves through the house when the blower cycles. Cleaning the ducts and correcting the moisture source removes the odor. Air fresheners won’t. Call (361) 326-5060 and we’ll find the actual source.
For critical components like blower motors and coils, we source OEM Lennox-compatible parts when they’re available. For duct sealing and insulation, we use aftermarket materials that meet or exceed OEM specifications. The goal is a sealed, properly moving air system, and we’ll explain exactly what we’re installing and why before the work starts.
Service Areas Near Seattle
Hollis Air Duct Cleaning serves Seattle and surrounding communities. Our crews also handle Lennox duct work in nearby metro areas including Los Angeles, Brooklyn, and Houston. For homeowners comparing our approach to other markets, we maintain the same Garrison Standard at our Lennox service in Nashville-Davidson and Lennox service in Las Vegas locations. Each office is independently owned and operated, so the crew that shows up in Seattle is the one accountable for the work.
Book Your Lennox Service in Seattle Today
Clean ducts, straight answers – that’s the whole job. Call (361) 326-5060 for a free estimate on Lennox duct cleaning in Seattle. We’ll price it in writing before we touch anything, and every job is covered by the 365-Day Done Right Promise.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Seattle since 2004.