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.
Lennox Air Duct Cleaning in Baltimore, CA | Hollis Air Duct Cleaning
We provide independent Lennox air duct cleaning across serving Baltimore, MD, and the one thing that sets our work apart here is simple: we know the rowhouse. Most duct cleaners run a brush through and leave. We trace the leaks, the coal dust, and the shared-wall problems that come with a Baltimore system. Roy Castellanos and our crew handle Lennox ductwork in this city daily, and we answer the phone at (361) 326-5060 when you call.
Why Baltimore Residents Choose Us for Lennox Service
Lennox builds a tight system, but Baltimore’s housing stock doesn’t always cooperate. A 1920s rowhouse with original galvanized ductwork in the basement puts stress on a Lennox system that a suburban tract home never will. We’ve opened enough floor registers in Federal Hill and Hampden to know exactly where those systems fail, and we fix them before the problem spreads.
Roy learned the trade the hard way: sheet metal and air conditioning at Los Angeles Trade-Technical College, then years of hands-on duct work before starting Hollis. He trains every technician to the same standard. When you book a Lennox duct cleaning with us, the person who shows up is background-checked and uniformed, and the price is written down before any tool comes off the truck. We’re not the manufacturer’s authorized arm. We’re the independent shop that knows how Lennox equipment behaves inside a Baltimore rowhouse. That’s the kind of knowledge you can’t get from a generic cleaner. For broader Lennox work, see our Lennox sales & service page.
Common Lennox Air Duct Cleaning Problems We Solve in Baltimore
- Evaporator coil corrosion and mold. Baltimore summers are muggy, and a Lennox coil in an unheated basement sweats. That moisture breeds mold, which then blows through every room. We clean the coil and treat the source, not just the symptom.
- Blower motor wear in tight mechanical closets. Many Baltimore rowhouses stuff the furnace into a closet barely wider than the unit itself. Restricted airflow makes the blower run hot and hard. We catch motor wear early and replace it before you’re without heat in January.
- Duct leakage at original galvanized connections. The original ductwork in a century-old Baltimore home was never sealed the way modern code requires. Gaps at the seams pull in whatever’s nearby: coal dust, crawlspace air, or your neighbor’s kitchen smells through the shared wall. We seal those connections properly.
- Heat exchanger cracks from freeze-thaw cycles. Older Lennox furnaces in Baltimore endure wild swings between frigid winter nights and warm afternoon thaws. That cycling stresses metal. A cracked heat exchanger is dangerous, and we flag it immediately when we find it.
- Coal dust intrusion through floor registers. This one is uniquely Baltimore. Homes built before 1950 often burned coal, and the residual dust still sits in the basement decades later. If your floor registers have gaps, that dust gets pulled into the Lennox system every time the blower kicks on. Sealing fixes it permanently.
Lennox Service in Baltimore: What Local Conditions Mean for Your Equipment
Here’s the thing about Baltimore that no out-of-town technician understands: in neighborhoods like Hampden and Federal Hill, the original duct systems have gaps at floor registers that suck in coal dust from old basements. This is a direct legacy of the city’s coal-heating past. Before gas forced-air furnaces took over, these rowhouses burned anthracite delivered through basement chutes. The coal is long gone, but the fine black dust remains packed into the dirt floors and foundation cracks. When your Lennox blower creates negative pressure in the return ducts, those register gaps act like a vacuum nozzle pointed at the basement floor. The result is a Lennox system that circulates 19th-century industrial residue through your living room. No other city the size of Baltimore has this density of original rowhouse ductwork, which is why our Lennox work here always starts with a video inspection and ends with sealing, not just brushing. If you want a full picture of where we work, check our Baltimore service area page.
Lennox Models & Products We Service in Baltimore
We work on every major Lennox line you’ll find in Baltimore homes, from the entry-level Merit Series to the Elite Series and the Dave Lennox Signature Collection. We also still see the old Lennox Complete Heat systems that were popular in rowhouse retrofits during the 1990s. For repairs, we use OEM parts when they’re available and high-quality aftermarket parts when OEM is backordered or discontinued. Our suppliers stock common Lennox coil, blower, and control components in the mid-Atlantic, so we’re not waiting on a slow freight truck from Texas when your Baltimore home needs a part. If a system is old enough that the repair cost outweighs the remaining life, we’ll tell you straight and walk you through the replace option with real numbers.
Lennox Service Pricing in Baltimore
Here’s what a Lennox duct cleaning in Baltimore actually costs through us. A whole-system Baltimore Air Duct Cleaning for a typical rowhouse runs between $350 and $650, depending on the number of returns, the furnace location, and how much sealing is needed. Duct sealing alone adds $400 to $900 if your system has multiple leaks at connections and register gaps. Evaporator coil cleaning runs $150 to $300 as an add-on when we’re already in the ducts, and video inspection is included on every job so you see what we found before and after. You get the written price before any work starts, and it does not move at the door. Call (361) 326-5060 for a free estimate, and we’ll give you a number you can plan around.
Serving Baltimore, OH - Our Local Coverage Area
We’re based in the Baltimore 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 Baltimore
Blame Baltimore’s humid summers and your basement. A Lennox coil in a damp rowhouse basement stays wet through June, July, and August, which is exactly the environment mold needs. The coil is also the last place air passes before it enters your ducts, so any mold there spreads through the house. Cleaning the coil solves the air quality issue. Fixing the basement moisture or adding a dehumidifier keeps it from coming back.
Yes, and we see it every week in Hampden, Federal Hill, and Canton. The cleaning removes the dust that’s already in the system. But the real fix is sealing the floor register gaps that allow the dust in to begin with. If you skip the sealing, you’re just making room for more coal dust next year. We do both on the same visit. Call (361) 326-5060 and we’ll explain what your specific rowhouse needs.
If the heat exchanger is cracked, replace it. That’s a safety issue, not a budget question. If the problem is a blower motor or a control board, the math changes. A $400 repair on a 20-year-old Lennox that runs fine otherwise usually makes sense. A $2,500 evaporator coil replacement does not. We’ll give you the numbers for both paths and let you decide, no pressure.
Every 3 to 5 years for most Baltimore homes, but rowhouses on the low end of that range. The shared walls, basement returns, and coal dust history mean the system loads up faster here than in a detached home in the county. If you renovated recently, clean after the drywall dust settles. If you have allergies or pets, lean toward every 2 to 3 years.
We do, but our focus is residential rowhouses, condos, and small apartment buildings under about 8 units. For larger commercial Lennox rooftop units, we can refer you to a mechanical contractor we trust. Call (361) 326-5060 and tell us what building you’re dealing with, and we’ll point you the right way either way.
Service Areas Near Baltimore
We serve Baltimore and the surrounding neighborhoods including Towson, Pikesville, Catonsville, Dundalk, and Essex. We also cover our other markets, including Lennox service in San Antonio and Lennox service in Arlington, for customers who split time between regions or own rental properties.
Book Your Lennox Service in Baltimore Today
Call (361) 326-5060 to get your Lennox duct cleaning on the schedule. We answer the phone, give you a written price, and show up when we said we would. Clean ducts, straight answers – that’s the whole job.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Baltimore rowhouses and Lennox systems since 2004.




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