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 Herndon, VA
HVAC cleaning in Herndon typically runs $380-$620 for a whole-system residential job, with most townhome systems falling in the $420-$550 range due to compact mechanical closets and aging flex ductwork. We’re CleanRun Duct Repair & Cleaning, and we serve Herndon from our Washington, DC dispatch office with crews that know the difference between a 1990s Dulles-corridor townhome and a newer build. Every job starts with a written price before work begins, and every duct run is photographed before and after. Call (571) 526-0015 for a free estimate.
Why Herndon Homes Are Different
Herndon’s housing stock is dominated by townhome communities built rapidly during the 1985-1998 Dulles Technology Corridor boom. A large share of these homes now carry original 30-to-40-year-old flexible ductwork that has never been professionally cleaned. Northern Virginia’s persistently high summer dew points create prime conditions for mold colonization inside those aging systems.
Unlike newer Loudoun County suburbs to the west, these Herndon-era townhomes typically have cramped mechanical closets that make duct access and thorough cleaning measurably more labor-intensive than a standard single-family job. The multi-year Silver Line Phase 2 construction along Herndon Parkway and Elden Street drew sustained construction particulates into HVAC intakes for nearby properties, leaving residual buildup that still circulates. Herndon’s position at the Piedmont-to-Coastal-Plain transition means clay-heavy soils elevate crawlspace moisture that can migrate into ductwork without proper vapor barriers.
Our Main Herndon Services
Most Herndon homeowners who call us need one of these three services:
Air Duct Cleaning in Herndon
We clean the full duct network in Herndon townhomes and single-family homes, including supply and return runs, registers, and the plenum (the central distribution box). The compact HVAC closets common in 1980s and 1990s construction here make access tight, so we use Rotobrush and Nikro equipment sized for confined spaces. Every run is photographed before and after. Air Duct Cleaning in Herndon includes the documented photo record as standard.
Dryer Vent Cleaning in Herndon
Dryer vent cleaning in Herndon addresses the lint accumulation that slows drying cycles and creates fire risk, especially in townhomes with long vent runs through shared walls. We clear the full line from appliance to exterior termination and verify airflow with a meter. Dryer Vent Cleaning in Herndon is quoted with a written price before we start.
Duct Repair & Sealing in Herndon
Duct repair and sealing in Herndon fixes the disconnected runs, torn flex duct, and failed tape seals common in original 1985-1998 construction. We seal with mastic and mechanical fasteners, not duct tape, and test for leakage reduction. Duct Repair & Sealing in Herndon carries the 365-Day Done Right Promise.
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
HVAC cleaning in Herndon targets the evaporator coils, blowers, and air handlers that work overtime in our humid summers, where dew points above 65°F drive condensation and microbial growth inside systems with minor air-sealing gaps. The 1985-1998 townhome stock here was built with factory-installed flex duct runs never designed for future serviceability, meaning components that should be cleaned every 3-5 years often go 15 or more. HVAC Cleaning from CleanRun includes full system photography and a written scope before any panel comes off.
Evaporator Coil Cleaning
Signs you need it
Ice buildup on refrigerant lines, weak airflow from registers, or musty odors when the AC cycles on in July.
What it costs in Herndon
Evaporator coil cleaning in Herndon typically runs $180-$320, with most townhome systems at the higher end due to closet access constraints.
How we do it
We remove the coil if accessible, apply foaming cleaner, rinse with low-pressure water, and photograph the fins before and after.
Blower Cleaning
Signs you need it
Vibration noise from the air handler, uneven heating or cooling across rooms, or dust puffing from registers at startup.
What it costs in Herndon
Blower cleaning in Herndon ranges from $150-$280 depending on whether the squirrel-cage assembly requires full removal.
How we do it
We disconnect power, extract the blower assembly, clean blades and housing with compressed air and solvent, balance the fan, and reinstall.
What HVAC Cleaning Costs in Herndon
| Item | Typical range in Herndon |
|---|---|
| Evaporator coil cleaning | $180-$320 |
| Blower cleaning | $150-$280 |
| Full HVAC system cleaning (coil, blower, air handler) | $380-$620 |
How do I know my HVAC needs cleaning, not just my ducts?
If your ducts are clean but rooms still heat unevenly, the blower or coil is likely clogged with debris the duct vacuum cannot reach. We inspect both with a camera and show you the photo before quoting.
Can HVAC cleaning fix the humidity smell in my Herndon townhome?
Yes, if the odor comes from microbial growth on the coil or in the condensate pan, which is common here given our summer dew points. We clean the component and treat the pan, then document the result with photos.
Air Quality & Sanitizing in Herndon
Air quality and sanitizing in Herndon addresses the mold, bacteria, and residual construction particulates that accumulate in 30-to-40-year-old flex duct systems, especially those within a half-mile of the Silver Line Phase 2 construction zone along Herndon Parkway and Elden Street. Northern Virginia’s humid subtropical climate pushes summer dew points above 65°F, and any duct system with minor air-sealing gaps will accumulate condensation and microbial growth inside supply runs. Air Quality & Sanitizing from CleanRun includes lab-verifiable treatment documentation and the standard photo record.
Mold Treatment
Signs you need it
Visible black or green growth at registers, persistent musty odor when the system runs, or recent water intrusion in the crawlspace.
What it costs in Herndon
Mold treatment in Herndon ranges from $280-$480 for localized application, with whole-system treatment running $450-$750 depending on duct run count.
How we do it
We apply an EPA-registered fungistat to affected duct runs using negative-pressure extraction to contain spores, then verify with post-treatment photography.
UV Light Installation
Signs you need it
Recurring mold despite cleaning, allergy symptoms that spike when the HVAC runs, or a system located in a damp crawlspace or closet.
What it costs in Herndon
UV light installation in Herndon typically costs $320-$550 for a properly sized unit with installation in the plenum or coil cabinet.
How we do it
We mount a UV-C lamp upstream of the coil, wire to the blower circuit for automatic cycling, and show the bulb placement in your photo record.
What Air Quality & Sanitizing Costs in Herndon
| Item | Typical range in Herndon |
|---|---|
| Mold treatment (localized) | $280-$480 |
| UV light installation | $320-$550 |
| Whole-system sanitizing (mold + bacteria + odor) | $450-$750 |
Is mold in my ducts common in Herndon townhomes?
Yes, the combination of 1980s-1990s flex duct, compact closets with poor ventilation, and our high summer dew points creates favorable conditions. We find active growth in roughly one-third of Herndon townhome systems we inspect.
Will UV lights actually prevent mold, or just slow it?
Properly installed UV-C at the coil surface prevents mold colonization there by breaking DNA bonds; it does not clean existing debris, so we pair installation with thorough coil cleaning first.
Brands We Service in Herndon
We stock parts and service equipment from Honeywell, Aprilaire, and Guardsman for Herndon jobs, with same-day availability on common filters, UV bulbs, and media pads. Our brands are listed with full model compatibility.
Pricing for Air Duct Cleaning in Herndon, VA
| Service | Typical range in Herndon |
|---|---|
| Air duct cleaning (whole system, townhome) | $320-$480 |
| Air duct cleaning (whole system, single-family) | $380-$580 |
| Dryer vent cleaning | $120-$220 |
| Evaporator coil cleaning | $180-$320 |
| Blower cleaning | $150-$280 |
| Full HVAC system cleaning | $380-$620 |
| Duct repair & sealing (per system) | $280-$520 |
| Mold treatment (localized) | $280-$480 |
| UV light installation | $320-$550 |
| Whole-system air quality sanitizing | $450-$750 |
Prices in Herndon run higher than national averages due to cramped mechanical closets and aging flex duct that requires more labor to access properly. Every price is written and agreed before work starts, per Haven Standard Clause 1. No per-vent pricing, no add-ons after arrival.
Neighborhoods We Serve in Herndon
We schedule Herndon appointments with route density in mind, typically offering next-day or two-day availability across the town. Crews carry the full equipment roster for townhome and single-family configurations alike.
- Dranesville
- Franklin Farm
- McNair
- Worldgate
- Floris
Service Area - Cities Near Herndon
CleanRun crews serve the full Dulles corridor and Fairfax County from our Washington, DC dispatch office. We regularly schedule alongside Herndon in Reston, VA, Sterling, VA, Fairfax, VA, and Centreville, VA. The same written-price protocol and documented photo record apply in every city we serve.
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 residential duct cleaning in Herndon, though some HOAs in planned communities like Franklin Farm require 24-hour notice for service vehicles. We handle documentation if your association requests it.
We typically offer next-business-day or two-day scheduling for Herndon, with routes planned around the town’s density and proximity to our dispatch corridor. Call (571) 526-0015 for current availability.
Yes, properties near the Herndon Parkway and Elden Street construction zone showed elevated particulate loading during 2015-2022, and we still find residual fine dust in those systems. A full cleaning with HEPA-filtered negative-pressure extraction removes material standard vacuums leave behind.
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
"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."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.