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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Before
AfterFast, Reliable HVAC Cleaning Across Derry
HVAC cleaning in Derry means pulling decades of construction dust, drywall debris, and oil-combustion soot out of duct systems that were never designed to hold it. Most Derry homes built between 1970 and 1995 still run their original sheet-metal and flex-duct runs, and a large share converted from oil to natural gas without anyone ever cleaning the ductwork. The result is a system circulating residue from the day the house was framed. Our crews know exactly what that looks like, and we document everything with a camera before and after. Call (806) 606-6902 for a written price on HVAC cleaning in Derry.
Why CleanRun Air Duct Cleaning Is Derry’s Preferred HVAC Cleaning Company
We’re not new to this. CleanRun has been documenting duct interiors since 2013, and over 52,000 homes later, the process hasn’t changed: written price first, camera inside every run, photo record delivered when we leave. Derry homeowners research before they call, and we’re built for that. You’ll see the inside of your ducts before we touch them, and again after the work is done.
Our technicians are background-checked, uniformed, and identified by name before arrival. They show up with Rotobrush and Nikro extraction equipment, not a shop vac bolted to a van. The 365-Day Done Right Promise is written into every job record, not printed on a flyer. Haven Standard Clause 1 says it plainly: written price before any panel comes off. That’s how we operate in Derry, and it’s how we operate everywhere.
When you call CleanRun, you get a live person on the line 24/7 who can schedule your HVAC cleaning and answer questions about scope. You won’t get a call center reading from a script. You’ll get a direct line to a company that treats documentation as the deliverable, not the sales pitch.
Our HVAC Cleaning Services in Derry
Every HVAC cleaning job in Derry starts the same way: a camera inspection of the plenum, supply runs, return runs, and the equipment cabinet. Then we quote a written price for the full system, not per vent. Here’s what we typically address in Derry homes.
Evaporator Coil Cleaning
The evaporator coil sits in the air handler and is where cold air gets made. In Derry homes that ran oil heat for decades and then converted, the coil often carries a cake of soot, construction dust, and pet hair that a standard filter never stopped. Our own field records show this daily. We pull the coil, photograph it, clean it with professional-grade coil cleaner and low-pressure rinse, and photograph it again before reassembly. A heavily coated coil forces the blower motor to work harder and fail early. That’s a $900-$1,800 repair bill in Derry that a $350-$650 coil cleaning can prevent.
Blower Cleaning
The blower motor and wheel are the lungs of your system. In the 1980s colonial we cleaned off Tsienneto Road last spring, the blower wheel was caked with drywall dust from the original build sitting under a layer of pet hair and soot. We pulled the blower assembly, cleaned each impeller blade, and documented the result. Blower cleaning in Derry typically runs $150-$300 as part of a full-system HVAC cleaning. It’s not a standalone upsell; if we see a dirty blower, it’s in the written scope before work starts.
Condenser Cleaning
The outdoor condenser coil collects leaves, grass clippings, cottonwood, and general New Hampshire spring fallout. In Derry specifically, homes surrounded by mature oak and maple stands off Adams Pond Road and around Crystal Lake tend to see heavier debris loading on the condenser fins. We clean the coil from the inside out, straighten bent fins, and check the refrigerant line insulation while we’re there. Condenser cleaning runs $120-$250 in Derry, and we recommend it at least once every two seasons.
Air Handler Cleaning
The air handler cabinet houses the blower, the evaporator coil, and often the heat exchanger access. Over 30-50 years, the cabinet accumulates what the ducts miss: a fine layer of dust on every interior surface that keeps recirculating. We vacuum, wipe down, and sanitize the full interior with an EPA-registered product. Air handler cleaning in Derry is typically $150-$300 and is almost always part of a full-system job rather than a separate visit.
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 Derry
We work on every major HVAC brand you’ll find in Derry: Carrier, Trane, Rheem, Lennox, Goodman, and York. We also maintain and clean systems that use Honeywell filters and Aprilaire media cabinets, and our extraction equipment includes Rotobrush and Nikro systems backed by Abatement Technologies HEPA filtration. We don’t use off-brand tools, and you’re welcome to look up any equipment name before we arrive. Our crews carry the cleaning chemistry and replacement filters sized to Derry’s most common system configurations, so we’re not making a second trip for a supply run.
Common HVAC Cleaning Problems We See in Derry Homes
- Builder-grade flex duct sagging across attic floors. In the subdivisions off Tsienneto Road and around Crystal Lake, 1980s construction often used uninsulated or lightly insulated flex duct laid directly on attic joists with minimal support. Over 40 years, those runs sag between supports, trapping condensation and standing dust. Mold colonization inside the duct liner is a frequent finding, and standard vacuuming alone won’t remove it. We use agitation tools paired with negative-pressure extraction to pull the liner clean.
- Oil-to-gas conversions that skipped duct cleaning. Derry’s housing stock was largely heated with oil through the 1980s, and when homeowners converted to natural gas, the original sheet-metal ducts were rarely opened, let alone cleaned. That leaves decades of oil-combustion soot baked onto the interior surfaces. The soot keeps shedding into the airstream, coating registers and leaving black film on walls near supply vents.
- Evaporator coils caked with construction dust from the original build. In new construction as well as older homes, drywall dust and construction debris gets into the duct system before the first homeowner moves in. Derry’s building boom from the 2010s through today means many homes are being handed over with visibly dirty supply registers. Builders are not required to clean ductwork at handover in New Hampshire, and most don’t. If a new Derry home has construction dust inside the supply registers, that dust is also coating the evaporator coil and blower motor.
- Retrofitted ductwork in unconditioned crawl spaces. Older homes near East Derry village and along Adams Pond Road often predate forced-air systems entirely. When ductwork was retrofitted into these homes, it frequently ran through tight crawl spaces that are unheated and unsealed. Freeze-thaw cycles in Derry’s October-through-April heating season create condensation inside those runs, and the result is moisture, mold, and rust in duct systems that were never designed for that environment.
Pricing for HVAC Cleaning in Derry, NH
A full-system HVAC cleaning in Derry typically runs $450-$850 for a single-family home up to 2,500 square feet. That includes the evaporator coil, blower, air handler, supply and return ducts, and the condenser coil, plus the documented photo record. Smaller ranches and two-bedroom homes fall on the lower end; larger colonials with long flex runs and multiple returns land on the higher end.
Evaporator coil cleaning alone runs $350-$650 in Derry. Blower cleaning runs $150-$300. Condenser cleaning runs $120-$250. Air handler cleaning runs $150-$300. When you combine coil, blower, and air handler cleaning into a full-system job, the total comes in under the sum of the parts. Every price is written before work starts, and it doesn’t change after we open the first panel. Haven Standard Clause 1.
If you have a written estimate from another company, bring it to us. We’ll put our number next to it, in writing, at no cost. Call (806) 606-6902 for an exact quote on your Derry home.
Key Takeaways
- Full HVAC cleaning in Derry typically runs $450-$850, with every dollar documented in writing before work starts.
- Derry’s 1970s-1990s housing stock carries a specific problem: oil-heat soot and construction dust that never got removed when systems converted to natural gas.
- Flex duct in unconditioned attics sags and traps moisture, and Derry’s freeze-thaw cycle makes it worse.
- Every CleanRun job includes a camera inspection and a photo record of the inside of every duct run, before and after.
- If you have construction dust in the supply registers of a newly built Derry home, that’s not normal, and the builder isn’t required to fix it. We can.
The Derry Problem Most Cleaners Never Address
Derry experienced a rapid suburban buildout through the 1970s, 1980s, and 1990s as a Route 28 bedroom community for commuters heading toward Manchester and the Massachusetts border. The dominant housing stock is 30-to-50-year-old colonials and ranches originally heated by oil-fired forced-air systems. When natural gas lines expanded through Rockingham County, a huge share of those homes converted, but the original ductwork was rarely cleaned during the conversion. That’s the thing. The gas furnace is new. The ducts are not.
What that means in practice: your new high-efficiency gas furnace is blowing air through ducts that still carry the residue of 20 or 30 years of oil combustion. Natural gas burns cleaner, but it doesn’t scrub the ducts. The soot stays, and it keeps shedding. We’ve seen supply registers in Derry homes with black film on the wall above them, and the homeowners had no idea where it came from. It came from the ducts.
No generic HVAC Cleaning page will tell you this, because most companies don’t look. We do. The camera goes in before the agitation tool comes out, and what we find in Derry is consistent: sheet-metal runs from the oil era, flex duct sagging across the attic, coils coated in the original construction dust. This is a 40-year-old problem. It doesn’t fix itself.
A Recent Job in Derry
Last spring we cleaned an HVAC system in a 1980s colonial off Tsienneto Road. The flex duct in the unconditioned attic had sagged so badly that a section held standing condensation and a thick layer of construction dust from the original build. Our techs ran a camera inspection first, then used negative pressure with HEPA filtration and agitation tools to pull out the packed debris from the supply and return ducts. The blower motor was caked with drywall dust and had to be pulled and cleaned separately. The homeowner had been changing his air filter every 90 days, and it made no difference, because the problem wasn’t the filter.
We delivered the full photo record that same day, every run documented inside before and after. That’s the CleanRun standard. If you can’t see it, it didn’t happen.
We Also Serve Cities Near Derry
Our crews serve Derry and the surrounding Rockingham and Hillsborough County communities, including HVAC Cleaning in Derry, Salem, Merrimack, Manchester, and Nashua. If you’re in any of these towns and need a documented, written-price HVAC cleaning, call (806) 606-6902 and we’ll schedule you directly. Scheduling and dispatch are coordinated from our Boston office, but the crews working in your home are local, vetted, and arrive in marked vehicles.
Serving Derry, NH - Our Local Coverage Area
We’re based in the Derry 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 Derry
It’s common, but it shouldn’t be treated as normal. During a Derry build, drywall sanding, floor sanding, and construction debris settle into the open duct runs before the registers are installed. Builders are not required to clean the ducts at handover in New Hampshire, so most don’t. The visible dust inside the supply registers is a sign that the evaporator coil and blower motor have been coated with the same dust since day one. A full HVAC cleaning with documented photos is the only way to confirm and remove it. Call (806) 606-6902 for a written price.
Yes. Flex duct in unconditioned attics sags over time, creating low points where condensation and debris pool. Sheet-metal runs are rigid and respond to standard agitation and extraction. Flex duct requires a slower, lower-pressure approach to avoid tearing the liner, and the sag points need tool access from both ends. Our techs have cleaned enough of these systems in the Tsienneto Road and Crystal Lake subdivisions to know what works without damaging the duct. We document the sagging and any mold inside the liner with our camera before and after. For an exact quote, call (806) 606-6902.
The most common reason in Derry is that the ducts themselves are the source. When a home converted from oil to natural gas without duct cleaning, decades of soot and construction dust remain inside the sheet-metal runs. The air filter never sees that debris because it’s downstream of the filter; the filter protects the equipment, not the registers. We’ve documented this in hundreds of Derry homes: a clean filter, a spotless furnace cabinet, and supply registers coated in gray or black dust. The fix is cleaning the full duct system, not buying a better filter. Call (806) 606-6902 and we’ll show you what’s actually inside your ducts before we quote anything.
Yes, if the crawl space allows physical access and the ductwork is structurally intact. Homes near East Derry village and along Adams Pond Road often have retrofitted ducts in tight, unconditioned crawl spaces. Derry’s freeze-thaw cycle creates condensation inside those runs, which leads to mold and rust. Our techs photograph the interior of the duct before starting, and if the metal is rusted through or the flex liner has failed, we’ll document that before any cleaning begins, so you have a written record of what’s serviceable and what needs repair. We don’t charge to assess; the camera inspection is part of the written quote process. Call (806) 606-6902 to schedule.
That black film is almost certainly oil-combustion soot left over from the home’s original oil-fired heating era, and it gets redistributed every time the blower runs. Soot is a respiratory irritant, not a good thing to breathe at low levels for years. Removing it requires more than a vacuum; the soot bonds to the duct walls and needs agitation to release. Our Rotobrush and Nikro tools are built for exactly this, and we document the before-and-after so you can see the duct go from black to bare metal. The 365-Day Done Right Promise applies to this work in writing. Call (806) 606-6902 and we’ll give you a written price to get it out of your air.
Written by Tomas Reyes, Owner at CleanRun Air Duct Cleaning, serving Derry since 2013.