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.
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AfterFast, Reliable HVAC Cleaning Across Merrimack
HVAC cleaning in Merrimack typically runs $450-$850 for a full-system cleaning of a 1970s-80s colonial or split-level, with coil cleaning adding $150-$300. Most jobs take four to six hours and include a documented photo record of every duct run before and after. If your Merrimack home still has its original ductwork, you’re breathing air that’s traveled through 40-50 years of accumulated dust, pet dander, and construction debris. Call CleanRun Air Duct Cleaning at (806) 606-6902 for a written price before any work starts.
Why CleanRun Air Duct Cleaning Is Merrimack’s Preferred HVAC Cleaning Company
We’ve worked enough homes along the Route 3 corridor to know exactly what Merrimack’s housing stock throws at a duct system. The town’s build-out happened fast in the 1970s and 1980s, and that era of construction left behind a specific set of problems: garage-adjacent return chases, original flex-duct that’s never been touched, and multi-floor layouts where the supply and return runs don’t balance well. Homeowners here don’t need a generic duct cleaning. They need someone who’s seen a hundred 1982 colonials with the same return-air bypass issue.
Tomas Reyes, who leads our team, built CleanRun around one principle that matters more in Merrimack than almost anywhere else we work: show the customer what’s actually inside their ducts, then price the fix in writing. No $79 coupon that becomes $900 once the tech arrives. No vacuum-and-leave job that re-contaminates in three weeks. Every Merrimack job ends with a photo record of every duct run, inside and out, so you can see the difference between real source removal and noise.
Our HVAC Cleaning team answers every call with a live person, and our written price comes before a single panel comes off your air handler. That’s Haven Standard Clause 1, and it’s not negotiable. If you’re in Merrimack and want to see what’s in your ducts before anyone touches them, call (806) 606-6902.
Our HVAC Cleaning Services in Merrimack
Evaporator Coil Cleaning
The evaporator coil sits inside your air handler and is the single biggest efficiency drain in a Merrimack home when it’s dirty. After a 40-year-old duct system has cycled dust for decades, the coil gets caked with a paste of dust and condensation that reduces airflow and forces your AC to work harder from June through September. We remove the coil access panel, photograph the coil before cleaning, then clean it with professional-grade equipment from brands like Rotobrush and Nikro. Homeowners in the Baboosic Lake Road area and across Merrimack’s older subdivisions routinely see a 10-15% drop in cooling costs after a proper coil cleaning. Merrimack coil cleaning runs $150-$300 as part of a full system cleaning.
Air Handler Cleaning
The air handler is the box that houses the blower motor, the coil, and often the filter. In homes off Continental Boulevard and Daniel Webster Highway, we find air handlers that have never been opened since installation. That means 40-plus years of dust packed into the blower wheel, reducing airflow and putting strain on the motor bearings. We clean the blower assembly, cabinet, and drain pan, and we photograph everything. A clean blower wheel in a Merrimack home with original ductwork will move noticeably more air through the registers on day one.
Condenser Cleaning
Your outdoor condenser unit sits through Merrimack’s full seasonal cycle: maple and oak pollen in spring, cottonwood fluff in June, leaf litter in October, and snow cover from December through March. The coil fins clog with that mix, and the unit can’t reject heat efficiently. We clean the condenser coil, clear debris from the cabinet interior, and check the fan for balance. It’s straightforward work, but skipping it on a humid Merrimack summer day means your system runs longer cycles for the same temperature drop.
Heat Exchanger Cleaning
Merrimack’s heating season runs from October through April, and a furnace that’s cycling for seven months straight builds carbon and dust on the heat exchanger surfaces. That reduces heat transfer and, in some cases, contributes to the musty heating-season odor that homeowners report from vents in older colonials and raised ranches. We clean accessible heat exchanger surfaces and photograph the condition before and after. If we find cracks or corrosion, we document it and recommend a licensed HVAC technician for repair - cleaning is not a substitute for a failing heat exchanger.
What happens when you call
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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.
BeforeAfterTrusted Brands We Service in Merrimack
We work on systems from every major manufacturer, and we don’t play favorites. Most Merrimack homes built in the 1970s and 1980s have Carrier, Trane, Lennox, or Rheem equipment, with the occasional York or Bryant system. Our equipment roster includes Abatement Technologies negative-air machines, Rotobrush agitation systems, and Guardsman sanitizing products. We stock common replacement filters, access panel screws, and drain line fittings on the truck so we’re not running back and forth to a supply house mid-job. That matters when you’re on a schedule in Merrimack and don’t want a half-day job turning into a two-day ordeal.
Common HVAC Cleaning Problems We See in Merrimack Homes
These are the failure patterns we see most often in Merrimack’s housing stock, not generic issues copied from a national template:
- Garage-adjacent return chases drawing fumes and particulates. The 1970s-80s construction pattern in Merrimack frequently placed return-air pathways through walls adjacent to attached garages. We’ve traced musty odors and exhaust smells in homes near Twin Bridges Park and the Woodbine Station area back to return plenums pulling from unconditioned garage cavities.
- Compacted debris in original flex-duct that superficial jobs leave behind. Register-level vacuum-only cleaning doesn’t agitate the compacted dust lining 40-year-old flex-duct in Merrimack’s split-levels and raised ranches. We use mechanical agitation to break that layer loose before extraction, because skipping that step means the ducts look clean for two weeks and then release the same dust again.
- Imbalanced supply and return runs in multi-floor layouts. Many Merrimack colonials have more supply registers than return grilles, which creates negative pressure zones that pull air from anywhere they can. When return pathways are undersized, the system draws from wall cavities, basements, and garage-adjacent chases, pulling contaminated air into the cleaned ducts within one heating cycle.
- Condensation and moisture buildup in the Merrimack River valley microclimate. The river valley holds more ambient humidity than the higher terrain to the east and west, and that moisture finds its way into duct systems seasonally. Dust plus moisture equals the paste we find on evaporator coils and the damp, musty smell homeowners report when the heat first kicks on in October.
Pricing for HVAC Cleaning in Merrimack, NH
A full HVAC system cleaning in Merrimack - supply ducts, return ducts, air handler, evaporator coil, blower assembly - runs $450-$850 for a typical 1970s-90s colonial or raised ranch. Larger homes over 3,500 square feet with extensive duct runs may run $850-$1,100. Condenser cleaning alone is $120-$200. Coil treatment with a Guardsman antimicrobial product adds $100-$150. Every price is delivered in writing before work starts, and that written number is the number you pay. Haven Standard Clause 1. No per-vent pricing. No upsell pressure. Call (806) 606-6902 and get a written price for your Merrimack home’s specific system.
We Also Serve Cities Near Merrimack
Our crews serve Merrimack and the surrounding communities across southern New Hampshire. If you’re in Nashua, Manchester, Derry, or Salem, we provide the same HVAC Cleaning in Merrimack standard: written pricing, documented photo records, and the 365-Day Done Right Promise. Dispatching is coordinated from our Boston office, with crews working locally in Merrimack every week.
Serving Merrimack, NH - Our Local Coverage Area
We’re based in the Merrimack 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 Merrimack
The musty smell comes from dust and moisture accumulating in the return duct system, often pulling from garage-adjacent chases or unconditioned wall cavities that were built into 1970s-80s Merrimack homes. When the furnace kicks on in October after sitting idle through late summer humidity, the blower pushes air through that damp, dusty layer and distributes the odor through every register. In the Woodbine Station area off Baboosic Lake Road, we traced this exact smell in a 1982 colonial to a return plenum feeding from a garage-adjacent chase, packed with fiberglass-laden debris. Sealing the plenum and running negative-pressure source removal eliminated the odor within two blower cycles. If you’re smelling it, it’s a return-side problem, not a supply-side problem. Call (806) 606-6902 for a written diagnosis.
Multi-floor condo buildings in Merrimack require coordinated access across all units sharing a dryer vent riser, because cleaning one floor’s section while leaving lint packed in another section of the stack creates backdraft pressure that can push lint into neighboring units. We schedule condo and apartment work through a single HOA or property management contact, then clean the entire riser from the roof or exterior termination point down to the lowest unit’s connection. Each section is photographed before and after, and the building manager receives the full documented record. Skipping floors or cleaning unit-by-unit without stack coordination is the most common failure mode we see in Merrimack’s condo and apartment communities.
Cleaning only the supply side in a Merrimack split-level leaves the return ducts untouched, and since return air flows through those ducts before it ever reaches the air handler, the blower pulls from whatever is accumulated there and re-contaminates the supply side within weeks. The risk is paying for a half job that doesn’t fix anything. In homes with the garage-adjacent return chases common to 1970s-80s Merrimack construction, skipping the return side means leaving the exact pathway that’s drawing fumes and particulates into the system. We clean both supply and return ducts on every job, and we photograph both sides so you can verify the work.
In most cases, yes. Original flex-duct from the 1980s may be discolored and have a layer of compacted dust on the interior liner, but as long as the liner is intact and the duct isn’t collapsed or torn, mechanical agitation plus negative-pressure extraction removes the debris without requiring replacement. We inspect with a camera before we clean, so if a section is damaged or degraded beyond cleaning, you’ll see the photo evidence and get a written recommendation for replacement. No one springs a surprise duct replacement on you mid-job.
Because the return-air chases in many Merrimack homes built between 1970 and 1990 run through walls directly adjacent to the attached garage, and if those chases have gaps or were never properly sealed, the HVAC system draws garage air - gas fumes, exhaust, stored chemical vapors - straight into the ducts. That means a “simple” cleaning that ignores the return pathway will clean the ducts and then refill them with garage air within one heating cycle. We treat attached-garage homes as diagnostic calls: inspect the return pathways, seal what needs sealing, and then clean the full system so the work actually holds. Call (806) 606-6902 for a written assessment.
If you’re in Merrimack and you want to know what’s actually inside your ductwork - with a written price, a documented photo record, and a 365-Day Done Right Promise in writing - call (806) 606-6902. Our team will walk you through the process, schedule the appointment, and make sure you see the before-and-after evidence of every duct run in your home.
Written by Tomas Reyes, Owner at CleanRun Air Duct Cleaning, serving Merrimack since 2013.