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
AfterAir Duct Cleaning in Derry, NH
Dryer vent cleaning in Derry is the service we recommend most often to homeowners in the 1970s-1990s colonials and ranches that dominate the Route 28 corridor. These homes share a common problem: original flex and sheet-metal ductwork that has carried decades of lint, oil-combustion soot from pre-conversion heating systems, and construction debris from the suburban buildout era. If your dryer takes longer than one cycle to dry a load, call (806) 606-6902 and we’ll give you a written price before any work starts.
Why Derry Homes Are Different
Derry’s housing stock is not like the newer subdivisions across the town line in Salem or Merrimack. Most of the single-family colonials and ranches here were built between 1970 and 1995, and a large share still run their original sheet-metal trunks with flex-duct branches. What that means in practice: the systems were sized for oil-fired furnaces, then converted to natural gas without anyone opening the ductwork. Oil-combustion soot is fine, powdery, and sticky. It bonds to the inside of return ducts and stays there for decades unless it is physically removed.
The climate pushes the problem further. Derry’s heating season runs roughly October through April, so forced-air systems cycle constantly for six-plus months. Flex duct in unconditioned attics, common in the 1980s builds off Tsienneto Road and around Crystal Lake, goes through repeated freeze-thaw condensation cycles. That moisture settles into the duct liner along with dust, creating the conditions where mold colonizes inside a system the homeowner cannot see. We photograph every run before and after, so the evidence is in your hands regardless of what the ducts look like from the register.
Our Main Derry Services
Most Derry calls start with one of two jobs: a full air duct cleaning, or the deeper HVAC cleaning that includes the blower, coils, and plenum. Both are described on their own pages.
Air Duct Cleaning in Derry
A full air duct cleaning in Derry means negative-pressure extraction through every supply and return run, including the plenum, branch lines, and registers. The work is priced by the system, not by the vent. On the 30-50-year-old systems common here, the camera often shows a 2-4 inch debris build-up at the first elbow, especially in homes that converted from oil heat without a post-conversion cleaning. See the full breakdown on our Air Duct Cleaning in Derry page.
HVAC Cleaning in Derry
HVAC cleaning goes past the ducts and addresses the equipment itself: blower wheel, evaporator coil, condensate pan, and plenum. In Derry’s colonials and ranches, the blower cabinets we open often hold a compacted mix of hair, construction dust, and oil soot that reduces airflow before conditioned air ever reaches the duct runs. See what the job covers and how it is priced on our HVAC Cleaning in Derry page.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
BeforeAfterDryer Vent Cleaning in Derry
Dryer vent cleaning in Derry is a fire-prevention job disguised as a routine maintenance call. Homes built in the 1970s-1990s subdivisions here often have long, multi-elbow dryer vent runs with 4-inch flexible foil or vinyl connectors, and in the oldest stock around East Derry village and Adams Pond Road the runs sometimes pass through unconditioned crawl spaces where lint collects against cold surfaces and clogs faster. That configuration, combined with six-month heating seasons and constant dryer use, produces a thick, compacted lint load inside the wall that no leaf blower or shop vacuum can reach. Our crews use professional rotary brush systems and document every run before and after on camera so you can verify the work was actually done. If you have never had the vent cleaned since buying your Derry home, start with an inspection and a written price. Learn more about the full service on our Dryer Vent Cleaning page.
Dryer Vent Inspection
Signs you need it
Your dryer runs more than one full cycle to dry a normal load, or the exterior vent flap does not open fully when the dryer is running.
What it costs in Derry
Dryer vent inspections in Derry are typically $90-$140 when billed as a standalone appointment.
How we do it
We run a camera through the full vent run from the dryer connection to the exterior termination, recording air-flow at each elbow and documenting any blockage or material failure.
Lint Removal
Signs you need it
You can see lint accumulating around the dryer opening, or the laundry room smells musty and hot while the dryer is on.
What it costs in Derry
Full lint removal in Derry is typically $130-$240 depending on the run length and the number of elbows.
How we do it
We disconnect the dryer, mechanically brush the full run with a rotary system to loosen compacted lint, then extract the debris under negative pressure and photograph the finished run.
Vent Rerouting
Signs you need it
Your existing vent run passes through an unconditioned crawl space or has more than three elbows, which traps moisture and lint even after cleaning.
What it costs in Derry
Vent rerouting in Derry is typically $300-$650 depending on the new path and the materials required to terminate the run properly outdoors.
How we do it
We run a new rigid-metal vent path with as few bends as possible, seal every joint with aluminum tape, and verify the exterior termination with a flow test before we leave.
Bird Guard Installation
Signs you need it
You hear nesting activity inside the exterior vent hood, or the existing flap has been damaged and no longer closes between cycles.
What it costs in Derry
Bird guard installation in Derry is typically $60-$120 added to a standard cleaning or quoted separately if the termination is accessible.
How we do it
We remove any nesting material, sanitize the termination area, and install a galvanized or stainless guard that keeps birds and rodents out without restricting airflow.
What Dryer Vent Cleaning Costs in Derry
| Item | Typical range in Derry |
|---|---|
| Dryer vent inspection | $90 - $140 |
| Lint removal (standard run) | $130 - $240 |
| Vent rerouting | $300 - $650 |
How often should Derry homeowners clean their dryer vents?
Every 12-18 months for most Derry homes, and every 12 months if the vent run is long, has multiple elbows, or passes through an unconditioned space. Annual cleaning keeps airflow high and keeps the fire risk low.
Can dryer vent cleaning actually prevent fires?
Yes. Lint is combustible, and a clogged vent raises the temperature inside the run until ignition becomes possible. Cleaning the run removes the fuel and restores the airflow that keeps the dryer operating within its designed temperature range. Call us at (806) 606-6902 and you’ll receive a written price before anything is scheduled.
Duct Repair & Sealing in Derry
Duct repair and sealing in Derry targets the silent problem in older forced-air homes: leaky joints, collapsed flex runs, and sagging trunks that quietly send conditioned air into attics, crawl spaces, and wall cavities. The original sheet-metal systems in 1970s-1990s colonials were installed with basic tape and friction fittings, and after 30-50 years of thermal expansion and humidity cycling, many of those joints have opened up. Homes off Tsienneto Road and around Crystal Lake often show flex duct laid across attic floors with minimal support, creating sags that trap standing debris and moisture year after year. The fix is mechanical, not magical: we repair or replace the failed section, seal the joints with mastic, and verify the result with a photo record. See the full breakdown on our Duct Repair & Sealing page.
Duct Sealing
Signs you need it
Some rooms never reach the temperature set on the thermostat, or your energy bills are high even though the system is running normally.
What it costs in Derry
Whole-system duct sealing in Derry is typically $400-$1,200 depending on the number of accessible runs and the severity of air loss.
How we do it
We apply mastic sealant to every accessible joint in the trunk, branch lines, and plenum, then pressure-test or flow-test the system to confirm the improvement.
Flex Duct Repair
Signs you need it
A flex run has collapsed, torn, or sagged below the level of the surrounding structure, usually visible as a room that never heats or cools properly.
What it costs in Derry
Individual flex duct repair in Derry is typically $150-$400 per run depending on length, diameter, and access.
How we do it
We remove the failed flex section, replace it with correctly sized and supported flex or rigid duct, and seal both ends with mastic before taking the before-and-after photos.
Metal Duct Repair
Signs you need it
You can see rust, crushed sections, or separated joints on exposed sheet-metal ducts in a basement or crawl space.
What it costs in Derry
Metal duct repair in Derry is typically $180-$450 per section depending on the extent of the damage and whether the section is accessible.
How we do it
We cut out the failed section, fabricate or source a matching replacement, and seal all connections with mastic and aluminum tape rated for HVAC use.
What Duct Repair & Sealing Costs in Derry
| Item | Typical range in Derry |
|---|---|
| Duct sealing (whole system) | $400 - $1,200 |
| Flex duct repair (per run) | $150 - $400 |
| Metal duct repair (per section) | $180 - $450 |
How do I know air is actually leaking from my Derry ducts?
The clearest sign is a temperature difference between rooms served by the same system, or a blower that runs constantly without satisfying the thermostat. We can verify leakage with a pressure test and show you the failing joints on camera before any repair starts.
Is duct sealing worth it in an older Derry home?
Yes, especially on systems that converted from oil heat. The original duct joints on 1980s builds were not designed for today’s high-efficiency systems, and every cubic foot of conditioned air lost into an attic is money spent heating a space you do not occupy. Call (806) 606-6902 for a written price on your specific system.
Air Quality & Sanitizing in Derry
Air quality and sanitizing in Derry addresses what duct cleaning alone cannot: the biological material growing or decaying inside the system. The freeze-thaw cycles in Derry’s unconditioned attics, combined with decades of oil soot and construction dust inside the ducts, create conditions where mold and bacteria take hold inside the flex-duct liner where it cannot be wiped down from the outside. Homeowners with persistent musty odors, allergy symptoms that worsen when the heat kicks on, or visible mold around registers are usually dealing with a colonization problem rather than a housekeeping one. We treat the system with professional-grade sanitizers designed for HVAC use and we photograph everything before and after so the evidence is in your hands. See the full breakdown on our Air Quality & Sanitizing page.
Mold Treatment
Signs you need it
You smell a musty, earthy odor from the registers whenever the blower runs, or you can see dark staining on the inside of supply vents.
What it costs in Derry
Mold treatment for a Derry duct system is typically $350-$900 depending on the size of the system and the extent of the colonization.
How we do it
We fog or spray an EPA-registered antimicrobial into the full duct system, allow the proper dwell time, and then document the post-treatment condition with the same camera we used before.
Odor Removal
Signs you need it
Odors persist after a full duct cleaning, usually from years of oil combustion residue or a previous owner’s pets and smoking.
What it costs in Derry
Odor removal in Derry is typically $200-$450 when added to a standard air duct cleaning.
How we do it
We apply a vaporized deodorizing agent through the duct system, focusing on the return plenum and the branch runs where odor particles settle, then run the blower to distribute the treatment evenly.
UV Light Installation
Signs you need it
Mold or bacteria keeps returning after cleaning, especially in homes where the evaporator coil stays damp through Derry’s humid summer months.
What it costs in Derry
UV light installation in Derry is typically $450-$900 installed, including the lamp, mounting hardware, and wiring.
How we do it
We mount a UV-C lamp at the evaporator coil or in the return plenum where it can continuously treat the air passing over the coil, then verify the placement with a photo record for your file.
What Air Quality & Sanitizing Costs in Derry
| Item | Typical range in Derry |
|---|---|
| Mold treatment | $350 - $900 |
| Odor removal | $200 - $450 |
| UV light installation | $450 - $900 |
Is the sanitizing chemical safe for Derry homes with kids or pets?
The antimicrobials we use are EPA-registered for HVAC application and are sprayed or fogged in the duct system, not in living space. We ask occupants to leave during the treatment and to wait until the product has dried before re-entering. A technician can answer specific product questions at (806) 606-6902.
Will sanitizing alone fix mold in Derry ducts?
Sanitizing kills the biological material, but if the moisture source remains, the mold will return. We recommend treating the root cause first, whether it is a sagging flex run, a damp crawl space, or a failed attic vapor barrier, and then sanitizing the cleaned system.
Brands We Service in Derry
We work on systems from all major manufacturers and stock parts locally for the brands most common in Derry’s 1970s-1990s builds, including Honeywell, Aprilaire, and Abatement Technologies. In most cases our crews arrive with the components needed for same-day repair or replacement. See our brands for the full list.
Pricing for Air Duct Cleaning in Derry, NH
| Service | Typical range in Derry |
|---|---|
| Full air duct cleaning (whole system) | $350 - $600 |
| HVAC cleaning (with equipment) | $500 - $900 |
| Dryer vent inspection | $90 - $140 |
| Lint removal | $130 - $240 |
| Duct sealing (whole system) | $400 - $1,200 |
| Flex duct repair (per run) | $150 - $400 |
| Metal duct repair (per section) | $180 - $450 |
| Mold treatment | $350 - $900 |
| UV light installation | $450 - $900 |
Two things push prices up in Derry. The first is access: older colonials and ranches with tight crawl spaces, finished basements, or equipment in unconditioned attics take longer to work on. The second is the state of the original ductwork, since a system that has never been opened since installation often needs more than a standard cleaning. Every job carries a written price before any panel comes off, and that price is the price, not a starting point.
Neighborhoods We Serve in Derry
We cover the full town, from the older village core around East Derry and Adams Pond Road to the subdivision clusters off Tsienneto Road and the Crystal Lake area. Our crews are working in Derry every week, and scheduling is coordinated from our metro office so we can usually offer an appointment within a few days of your call.
- East Derry village
- Adams Pond Road area
- Tsienneto Road subdivisions
- Crystal Lake area
- Route 28 corridor
Service Area - Cities Near Derry
In addition to Derry itself, we serve homeowners in Salem, NH, Merrimack, NH, Manchester, CT, and Nashua, NH. If you live just over the town line or are splitting time between Derry and another property, we can help with either.
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 About Air Duct Cleaning in Derry
Most Derry appointments are scheduled within a few days of your call. Scheduling is coordinated from our metro office and our crews work in Derry on a weekly basis, so we do not treat the town as a special trip. Call (806) 606-6902 and we will give you a written price before anything is booked.
No permit is required in Derry for standard duct cleaning, dryer vent cleaning, duct sealing, or air-quality treatment. If we find something that does require a permit, such as a vent reroute through an exterior wall, we will tell you in writing before any work is scheduled.
The age of the housing stock, mainly. Most Derry systems are 30-50 years old, originally sized for oil heat, and never cleaned when the home converted to natural gas. That creates a specific debris profile, oil soot plus construction dust plus decades of pet and skin dander, that only shows up on camera. Newer towns have more systems that are simply dirty, not structurally compromised. Call (806) 606-6902 for a free estimate, and you will have a written price before any work is performed.
What happens when you call
- 1A real person answersNo phone trees - talk to a local air duct cleaning pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3We come out and measureLicensed & insured, at a time that suits you - the visit and the quote are both free.
- 4You get the price in writingLine-itemed, yours to keep, and nothing starts until you say go.
What Derry Customers Say
"On time, professional, and explained what the readings meant without talking down to me."
- Warren E."The before and after photographs of each run are the reason I used them. You cannot argue with what came out of the return."
- Marguerite O."Flat price agreed up front, no per-vent add-ons at the end. That was the whole reason I did not call the coupon company."
- Suzanne B.