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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After
Before
After
Before
AfterAir Duct Cleaning in Herndon, VA
Whole-home HVAC cleaning in Herndon typically runs $380-$620 for a single system, with most jobs completed in one visit. Herndon’s 1985-2000 housing stock, combined with its position under Dulles flight corridors and in low-lying humid terrain near Sugarland Run, creates duct conditions we don’t see in neighboring towns. If you’re scheduling service, call (240) 318-7712. We’ll deliver a written price before any work starts, under Haven Standard Clause 1.
Why Herndon Homes Are Different
Herndon sits directly beneath active flight approach corridors for Washington Dulles International Airport. Aviation ultrafine particulates and jet exhaust byproducts settle here at measurably higher rates than in Reston or Leesburg, working into HVAC systems through fresh-air intakes and envelope infiltration. The town’s dominant housing stock, townhomes and detached single-family homes built during the 1985-2000 tech boom, now runs 25-40 years old. These were built with flexible plastic ductwork routed through unconditioned attics, and that flex duct is now sagging, tearing at joints, and trapping debris in ways rigid metal systems do not.
Northern Virginia’s humid subtropical summers push dewpoints into the low-to-mid 70s°F for weeks. Herndon’s low elevation near Sugarland Run and other stream corridors adds ground-level humidity that higher-elevation neighbors don’t face. When undersized or short-cycling systems fail to dehumidify properly, condensation forms inside flex duct liners and at supply registers, seeding mold colonies deep in the runs. Summer attic temperatures here regularly exceed 130-140°F, accelerating breakdown of the inner plastic liner. We frequently find the liner has partially collapsed inward, creating accordion-style debris traps that cleaning alone cannot fix.
Our Main Herndon Services
Herndon homeowners call us most often for these three services. Each has its own dedicated Herndon page with deeper detail on local conditions and pricing.
Air Duct Cleaning in Herndon
We clean every duct run with negative-pressure extraction, photographing the interior before and after each segment. In Herndon, we regularly find aviation particulate buildup combined with collapsed flex duct liner from decades of attic heat exposure. The camera shows the difference between surface vacuuming and actual debris removal. Air Duct Cleaning in Herndon covers full-home pricing and what we typically document in local homes.
Dryer Vent Cleaning in Herndon
Dryer vent blockages in Herndon’s townhome clusters often involve longer-than-code vent runs through multiple elbows. We rotary-brush the full length and airflow-test before signing off. Lint accumulation here is compounded by the area’s humidity, which causes matting at low points in the run. Dryer Vent Cleaning in Herndon has specifics on townhome configurations and pricing.
Duct Repair & Sealing in Herndon
Herndon’s aging flex duct frequently requires repair before cleaning is effective. We replace collapsed segments with properly supported flex or transition to rigid metal where accessible, then seal with mastic. The photo record shows the structural fix, not just the cleaning result. Duct Repair & Sealing in Herndon details when repair precedes cleaning.
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.
BeforeAfterHVAC Cleaning in Herndon
Herndon’s 1985-2000 homes were built with HVAC systems now operating past their original design life, in a climate that demands both heavy cooling dehumidification and winter heating. The combination of aviation particulate load, humidity-driven condensation, and aging equipment means system components here foul faster than the regional baseline. HVAC Cleaning addresses the full system, not just the ductwork, and we document every component photographically.
Evaporator Coil Cleaning
Signs you need it
Ice buildup on the coil, weak airflow from registers, or a musty odor when the AC cycles on in Herndon’s humid July afternoons.
What it costs in Herndon
Evaporator coil cleaning in Herndon typically runs $180-$280, with access difficulty in attic-mounted air handlers pushing toward the higher end.
How we do it
We remove the access panel, apply foaming cleaner to the coil fins, rinse with low-pressure water to avoid fin damage, and photograph the before and after condition for the job record.
Blower Cleaning
Signs you need it
Vibration or noise from the air handler, uneven heating or cooling across rooms, or dust puffing from registers when the system starts.
What it costs in Herndon
Blower assembly cleaning in Herndon generally falls between $160-$240, depending on whether the blower requires full removal for access.
How we do it
We power down the unit, remove the blower assembly, clean the wheel and housing with compressed air and solvent, balance the wheel on reassembly, and document the debris volume removed.
What HVAC Cleaning Costs in Herndon
| Item | Typical range in Herndon |
|---|---|
| Evaporator coil cleaning | $180-$280 |
| Blower assembly cleaning | $160-$240 |
| Full system cleaning (coil + blower + ductwork) | $380-$620 |
How do I know the evaporator coil is actually dirty?
We photograph the coil before touching it; the photo is included in your job record, so you see the fouling we found rather than taking our word for it. Call (240) 318-7712 for a written estimate.
Can HVAC cleaning fix short cycling in Herndon homes?
It can if restricted airflow from a dirty blower or coil is the cause; we test static pressure before and after to verify improvement, and we flag structural duct issues that cleaning won’t solve. Call (240) 318-7712 for a written estimate.
Air Quality & Sanitizing in Herndon
Herndon’s humidity, aviation particulate load, and aging flex duct create conditions where biological growth outpaces what cleaning alone can address. The condensation we find inside duct liners and at supply registers seeds mold colonies that recur if not treated at the source. Air Quality & Sanitizing targets these biological and odor problems with documented application methods.
Mold Treatment
Signs you need it
Visible growth on register fins or duct liner, a persistent earthy odor when the system runs, or condensation stains on ceiling drywall near vents.
What it costs in Herndon
Whole-system mold treatment in Herndon typically ranges $320-$480, with severity and system size determining placement in that range.
How we do it
We apply EPA-registered fungistatic treatment to all interior duct surfaces using mechanical fogging, verify coverage with UV tracer, and include post-treatment photos in the job record.
UV Light Installation
Signs you need it
Recurring mold after prior treatment, frequent allergy symptoms when the system runs, or a home with chronic humidity control problems.
What it costs in Herndon
UV-C lamp installation in Herndon generally runs $280-$420 for a properly sized lamp with ballast and mounting hardware.
How we do it
We mount the lamp downstream of the coil with interlocked power so it operates only when the blower runs, then verify UV intensity at the duct wall with a radiometer.
What Air Quality & Sanitizing Costs in Herndon
| Item | Typical range in Herndon |
|---|---|
| Mold treatment (whole system) | $320-$480 |
| UV-C lamp installation | $280-$420 |
| Combined mold treatment + UV installation | $520-$780 |
Does mold treatment make ducts look clean again?
The treatment kills active growth and prevents regrowth; heavy staining may remain visible, which we document in the photo record so you know what was treated versus what was cosmetic. Call (240) 318-7712 for a written estimate.
How long does UV light last before replacement?
Lamp output degrades gradually; we recommend replacement at 9,000-12,000 operating hours, typically 12-18 months in Herndon’s climate, and we note install date on the lamp housing. Call (240) 318-7712 for a written estimate.
Brands We Service in Herndon
We stock parts and service equipment from Honeywell, Aprilaire, and Abatement Technologies, with filters and UV lamps available for same-day replacement in most Herndon homes. Our brands page lists the full equipment roster, including Guardsman and Rotobrush systems we deploy on local jobs.
Pricing for Air Duct Cleaning in Herndon, VA
| Service | Typical range in Herndon |
|---|---|
| Air duct cleaning (whole home, single system) | $280-$480 |
| Dryer vent cleaning | $120-$180 |
| HVAC system cleaning (ducts + coil + blower) | $380-$620 |
| Evaporator coil cleaning only | $180-$280 |
| Blower assembly cleaning only | $160-$240 |
| Duct repair & sealing (per system) | $240-$520 |
| Mold treatment (whole system) | $320-$480 |
| UV-C lamp installation | $280-$420 |
| Air purifier installation (whole-house) | $420-$680 |
Herndon jobs trend toward the higher end of these ranges when attic access is restricted by collapsed flex duct or when aviation particulate buildup requires extended cleaning time. Every price is written and agreed before work starts, with no per-vent add-ons or post-arrival revisions.
Neighborhoods We Serve in Herndon
We schedule Herndon appointments with routing from our Washington, DC office, typically offering next-day or two-day availability across the town. Crews are background-checked under Haven Standard Clause 3 and identified by name before arrival.
- Dranesville
- Franklin Farm
- McNair
- Woodland Park
- Floris
Service Area - Cities Near Herndon
CleanRun crews serve the full Dulles corridor and Fairfax County interior. We regularly schedule alongside Herndon in Reston, VA, Sterling, VA, Chantilly, VA, and Vienna, VA, with the same written-price protocol and documented photo record on every job.
Serving Herndon, VA - Our Local Coverage Area
We’re based in the Herndon 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 Herndon
No permit is required for standard cleaning or sealing; duct replacement that alters the HVAC footprint may need Fairfax County review, and we flag this during the estimate if it applies to your home. Call (240) 318-7712 for a written estimate.
Herndon’s townhome communities and planned neighborhoods often have weekday hour restrictions; we schedule within those windows and provide proof of insurance and technician identification on request. Call (240) 318-7712 for a written estimate.
We typically offer next-day or two-day availability for Herndon appointments, with scheduling coordinated from our Washington, DC office and crews dispatched locally. Call (240) 318-7712 for a written estimate.
We service single-family homes and townhomes throughout Herndon; multi-story apartment buildings with centralized systems fall outside our scope, and we’ll say so directly if you call. Call (240) 318-7712 for a written estimate.
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 Herndon Customers Say
"My allergies genuinely improved. They also told me the ducts did not need sealing, which I had been quoted for elsewhere."
- Petra K."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."They found a disconnected duct in the crawl space that had been dumping conditioned air under the house for years. Photographed it, quoted the repair, fixed it."
- Devon A.