Fast, Reliable HVAC Cleaning Across Londonderry
HVAC cleaning in Londonderry, New Hampshire typically costs between $350 and $850 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 our technicians are usually on-site in Londonderry within a few hours of scheduling.
We’ve worked in Londonderry since 1984, long enough to know the difference between a 1978 split-level off Mammoth Road and a 2002 colonial near Woodmont Commons. The town’s housing stock is unusually concentrated, built almost entirely during the commuter boom from the 1970s through the 1990s. That means forced-air systems of a very specific age, with very specific problems. We don’t guess. We camera-inspect before we touch a tool, and we show you what we find.
Call (844) 685-6342 for upfront pricing and a free estimate. The number we give you is the number on the invoice.
Why Bellows Air Duct & Vent Co. Is Londonderry’s Preferred HVAC Cleaning Company
Londonderry homeowners call us because we’ve been here long enough to understand what “local” actually means. We know that a colonial on Pillsbury Road faces different air-quality pressures than a split-level off Route 102, and we adjust our approach accordingly.
Our reputation in Londonderry is built on repeat customers and referrals, not coupon drops. Homeowners here tend to stay put for decades, and they remember which company showed up on time, wore boot covers, and left the system cleaner than they found it. Our 90-Day Done Right Promise is stamped on every job in writing: if something isn’t right, we return at no charge. No paperwork, no arguing.
Calls are answered by a live person, 24/7. Not a voicemail tree, not an app. When your blower motor is laboring or your evaporator coil is clogged with pollen from the apple orchards along Mammoth Road, you talk to someone who can dispatch a technician.
Our technicians are background-checked, uniformed, and trained on the specific equipment found in Londonderry’s older homes: original sheet-metal trunks, aging flex-duct branches, and air handlers that have been running since the Reagan administration.
Our HVAC Cleaning Services in Londonderry
Evaporator Coil Cleaning
The evaporator coil in your air handler is where moisture collects and where debris settles during Londonderry’s long cooling season. In homes near the airport flight path, we’ve found coils clogged with that fine, oily gray particulate within a single heating season, choking airflow and forcing the compressor to work harder. A typical evaporator coil cleaning in Londonderry runs $280-$450. We use foaming cleaners and low-pressure rinses that won’t damage delicate fins, then verify the results with our camera.
Blower Cleaning
The blower wheel moves every cubic foot of air through your system. When it’s coated with dust, pet dander, and construction debris from 40-year-old ductwork, it can’t push air efficiently. In Londonderry’s 1970s and 1980s colonials, we regularly find blowers caked with material that’s been recirculating since the original installation. Blower cleaning here typically costs $180-$320. We remove the assembly when possible, clean it outside the unit, and balance it before reinstallation.
Condenser Cleaning
Your outdoor condenser coil faces Londonderry’s harsh winters and pollen-heavy springs. Cottonwood from the Merrimack River valley, grass clippings from dense suburban lots, and plain old road grit all pack into the fins. A dirty condenser can’t reject heat, so your electric bill climbs while your house stays warm. Condenser cleaning in Londonderry generally runs $150-$280. We straighten bent fins, clean the coil chemically, and check refrigerant levels while we’re there.
Air Handler Cleaning
The air handler is the heart of the system, and in Londonderry’s older homes, it’s often the most neglected component. Original units from the 1980s and 1990s have internal liners that degrade over time, creating a porous surface where mold and bacteria colonize. Standard duct vacuuming won’t touch this. Our air handler cleaning service, typically $320-$550 in Londonderry, includes full access-panel removal, mechanical brushing of all internal surfaces, and application of a coil treatment to inhibit biological regrowth. We recently serviced a 1980s colonial on Pillsbury Road where the homeowner noticed a persistent oily residue on furnace filters. Our Rotobrush inspection revealed the distinctive jet-exhaust particulate coating the return-air plenum and degrading the liner at the main trunk/flex-branch junctions. We cleaned the entire system and recommended upgrading to a MERV 11 filter with quarterly changes to manage the unique airborne load.
Heat Exchanger Cleaning
Crucial for safe, efficient heating. In Londonderry’s aging systems, soot and corrosion can compromise this component. Inspection and cleaning run $250-$400.
Coil Treatment
After mechanical cleaning, we apply a non-toxic, EPA-registered treatment to evaporator and condenser coils that inhibits mold and bacterial growth for up to six months. Given Londonderry’s heavy pollen seasons and the unique oily particulate near the airport, this treatment pays for itself in reduced maintenance and improved airflow. Coil treatment as a standalone service runs $120-$200; it’s included with our full air handler cleaning package.
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 Londonderry
We maintain equipment from Rotobrush, Abatement Technologies, and Aprilaire, the same brands serious HVAC contractors specify for commercial and residential work. Our Londonderry technicians carry common replacement parts for these systems on every truck, which means most repairs and cleanings finish in one visit. We don’t order parts from California and make you wait. If your air handler uses a proprietary Aprilaire media cabinet or your duct system was sealed with Abatement Technologies mastic, we’ve worked on it before, probably this month.
Common HVAC Cleaning Problems We See in Londonderry Homes
- Aging flex-duct branches collapse internally. The original flex-duct installed in Londonderry’s 1970s and 1980s housing stock has reached end of life. We find collapsed sections and failed joint tape that pull attic dust and insulation fibers directly into the air stream, even after the ducts themselves are cleaned.
- Degraded liner in sheet-metal trunks traps biological debris. Original galvanized trunks with internal fiberglass liner accumulate mold and bacteria that standard vacuuming cannot fully remove. Without secondary coil and air-handler treatment, the contamination recirculates within weeks.
- Jet-exhaust particulate near airport flight paths. Homes east of Route 93, particularly around Pillsbury Road and Grenier Field Road, develop a fine, oily gray coating in return-air ducts that is not typical household dust. This material degrades filters faster and clogs evaporator coils within a single season.
- Retrofitted central AC on ductwork never properly resealed. Many Londonderry split-levels and colonials had air conditioning added in the 1990s and 2000s through existing trunk lines. The new high-velocity airflow finds every gap in aging joints, pulling attic air and construction debris into living spaces.
Pricing for HVAC Cleaning in Londonderry, NH
| Service | Typical Range in Londonderry |
|---|---|
| Full system HVAC cleaning (ducts + air handler) | $650-$850 |
| Evaporator coil cleaning | $280-$450 |
| Blower cleaning | $180-$320 |
| Condenser cleaning | $150-$280 |
| Air handler cleaning | $320-$550 |
| Coil treatment (standalone) | $120-$200 |
| Heat exchanger cleaning | $250-$400 |
What moves the price? Accessibility of your air handler, the degree of contamination, whether we find failed duct joints that need sealing, and whether your system requires our coil treatment for biological control. We disclose the full price before we lift a single tool. No bait coupons, no price changes at the door.
Standing offers for Londonderry 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.
Call (844) 685-6342 for an exact quote. Estimates are free.
We Also Serve Cities Near Londonderry
Our HVAC Cleaning in Londonderry operation also covers Derry, Derry Village, Litchfield, and Windham. The same technicians, the same equipment, the same 90-Day Done Right Promise. If you’re in a neighboring town and found this page, we likely service your address.
Serving Londonderry, NH - Our Local Coverage Area
We’re based in the Londonderry 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 Londonderry
Your 1980s colonial likely has original flex-duct branches and sheet-metal trunks that have developed gaps, collapsed sections, and degraded internal liner over 40 years of use. The housing stock in Londonderry was built during a concentrated suburban boom with materials that are now at end of life, whereas Bedford has a more mixed housing age with newer duct systems. We camera-inspect to show you exactly where the leaks are. Call (844) 685-6342 for a free estimate.
No, it’s not normal for most towns, but it is common in Londonderry neighborhoods under the Manchester-Boston Regional Airport flight path. The fine, oily gray particulate from jet exhaust deposits in return-air ducts and coats filters faster than standard household dust. We recommend upgrading to a MERV 11 filter with quarterly changes and more frequent air-handler cleaning. Call (844) 685-6342 and we’ll inspect your system.
Duct cleaning alone often won’t eliminate a musty smell if the source is biological growth in the air handler or evaporator coil, which is common in Londonderry after our wet springs. We inspect the full system with cameras to locate the source, then clean the coil and treat it to prevent regrowth. The smell usually resolves when we address the component causing it, not just the ducts. Call (844) 685-6342 for diagnosis.
Central AC retrofitted into existing ductwork often operates at higher velocities than the original heating-only system was designed for. In Londonderry’s 1990s split-levels, this pressurizes aging joints and pulls attic dust and insulation fibers into the air stream. We find and seal those gaps, then clean the full system. The dusty smell typically disappears once the duct integrity is restored. Call (844) 685-6342 for an inspection.
Yes, if your air handler has internal liner degradation or biological growth, which we see frequently in Londonderry’s 30-to-50-year-old systems. Duct vacuuming doesn’t reach the blower compartment, evaporator coil, or plenum chambers where the worst contamination hides. Our full-service cleaning addresses both ducts and air handler, verified with before-and-after camera documentation. Call (844) 685-6342 for pricing on combined service.
Ready to get your system cleaned right? Call Bellows Air Duct & Vent Co. at (844) 685-6342 for upfront pricing and a free estimate. We’ll be there when we say, we’ll show you what we find, and we’ll stand behind the work for 90 days in writing.
Written by Ray Castillo, Owner at Bellows Air Duct & Vent Co., serving Londonderry since 1984.