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 job, and every quote we deliver is a written, flat price agreed before work starts. Herndon’s 1980s-1990s townhome stock and its position under Dulles flight paths create a specific set of duct conditions we see nowhere else in Northern Virginia. We dispatch crews to Herndon from our Washington, DC office, and every job includes a documented photo record of every duct run, before and after. Call (571) 487-7204 for a free written estimate.
Why Herndon Homes Are Different
Herndon sits immediately east of Dulles International Airport under active approach and departure corridors, exposing residential HVAC systems to measurably elevated concentrations of jet-exhaust particulates and ultrafine carbon soot that neighboring communities farther from the flight paths simply don’t accumulate at the same rate. Combined with the town’s dominant 1980s-1990s townhome housing stock - where flexible ductwork is now 30-40 years old and degrading - technicians here routinely find heavier soiling loads and collapsing duct liners that reflect both the airport’s proximity and the age of the builds.
The HVAC air handler in these townhome clusters is frequently crammed into a first-floor utility closet or a low attic knee-wall space with almost no service clearance, meaning flex duct was often kinked or sharply bent during original installation. Those bends trap debris disproportionately and are the first sections to delaminate, yet they’re the hardest for technicians to access and the most commonly skipped by less thorough crews. Northern Virginia’s humid subtropical climate delivers summers where relative humidity in Herndon regularly exceeds 70-75%, and any breach in aging flex-duct connections allows that moisture to condense inside insulated duct walls, creating persistent mold conditions.
Our Main Herndon Services
Herndon homeowners call us most often for these three services:
Air Duct Cleaning in Herndon
We clean the full duct network - supply and return runs, trunk lines, and registers - using negative-pressure extraction (a sealed vacuum on the main trunk that pulls debris out without releasing it into the home). In Herndon, we pay particular attention to the kinked flex sections common in townhome utility closets, where debris compacts and standard tools often miss. Every run is photographed before and after. Air Duct Cleaning in Herndon includes the full documented photo record.
Dryer Vent Cleaning in Herndon
Dryer vent blockages are a fire hazard and efficiency killer. In Herndon’s townhomes, the vent run is often long, with multiple elbows routing through finished walls to an exterior termination. We rotary-brush the full length and airflow-test the termination. Dryer Vent Cleaning in Herndon concludes with a written airflow reading.
Duct Repair & Sealing in Herndon
When flex-duct liners delaminate or metal seams separate, cleaning alone won’t fix the problem. We replace collapsed sections, seal leaks with mastic or metal-backed tape, and restore proper airflow. Duct Repair & Sealing in Herndon jobs include a post-repair pressure test.
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.
Before
AfterHVAC Cleaning in Herndon
HVAC cleaning in Herndon addresses the components the ductwork connects to: the evaporator coil, blower, condenser, air handler, and heat exchanger. In this market, the combination of jet-exhaust particulate loading and 30-40-year-old flex duct means these components work harder and foul faster than in newer construction farther from Dulles. We clean each element with equipment matched to its material and accessibility. HVAC Cleaning service details are available on our main hub page.
Evaporator Coil Cleaning
Signs you need it
Ice buildup on refrigerant lines, weak airflow from registers, or cooling that can’t keep up on humid July afternoons in Herndon.
What it costs in Herndon
Evaporator coil cleaning typically runs $180-$340 in Herndon, depending on whether the coil is in an accessible attic or buried in a tight closet.
How we do it
We apply foaming cleaner, let it dwell, then rinse with low-pressure water and a drain pan recovery setup so nothing leaks into finished spaces.
Blower Cleaning
Signs you need it
Dust puffing from registers at startup, a blower wheel that rattles or hums, or an air handler that cycles longer than it used to.
What it costs in Herndon
Blower cleaning in Herndon ranges from $140-$260 for standard residential units, with tighter closet installations at the higher end.
How we do it
We remove the blower assembly, clean the wheel and housing with compressed air and contact cleaner, balance the wheel, and reinstall with a fresh filter.
What HVAC Cleaning Costs in Herndon
| Item | Typical range in Herndon |
|---|---|
| Evaporator coil cleaning | $180 - $340 |
| Blower cleaning | $140 - $260 |
| Full HVAC system cleaning (coil, blower, air handler) | $380 - $620 |
How do I know my HVAC components are actually dirty?
We photograph every component before touching it, and you see the image before we quote the work. If the coil is clean, we say so and move on. Call (571) 487-7204 for an inspection and exact quote - estimates are free.
Can HVAC cleaning fix my high summer electric bills?
A fouled coil or blower can raise energy use 15-30% by forcing longer run times, but we won’t promise dollar savings we can’t verify. We document the condition, clean what needs cleaning, and let the meter tell the rest.
Air Quality & Sanitizing in Herndon
Air quality and sanitizing in Herndon targets the microbial load that thrives in this climate: mold in humid duct walls, bacteria on wet coils, and the persistent musty odor that older townhome HVAC systems develop after decades of moisture cycling. The same jet-exhaust particulates that soil ducts faster here also provide a nutrient base for biological growth when humidity breaches the system. Air Quality & Sanitizing service details are on our hub page.
Mold Treatment
Signs you need it
Visible mold at registers, a wet-closet smell when the system starts, or flex-duct sections with collapsed insulation that stays damp.
What it costs in Herndon
Mold treatment for a typical Herndon townhome system runs $280-$480, including application and post-treatment verification sampling.
How we do it
We apply an EPA-registered antimicrobial to all interior duct surfaces using a fogging system, then HEPA-vacuum loose debris and deliver lab-verified clearance documentation.
UV Light Installation
Signs you need it
Recurring mold after cleaning, a coil that needs annual treatment, or household members with persistent respiratory sensitivity.
What it costs in Herndon
UV-C light installation in Herndon ranges from $320-$580 depending on duct configuration and whether the light mounts at the coil or in the return plenum.
How we do it
We mount a Honeywell or Aprilaire UV-C lamp at the coil or air handler, wire it to the blower circuit, and show you the lamp status indicator before we close the panel.
What Air Quality & Sanitizing Costs in Herndon
| Item | Typical range in Herndon |
|---|---|
| Mold treatment (whole system) | $280 - $480 |
| UV-C light installation | $320 - $580 |
| Combined sanitizing package (mold + UV) | $520 - $920 |
Is the antimicrobial treatment safe for kids and pets?
We use EPA-registered products applied to interior duct surfaces only, with a 4-hour dwell and ventilation period before the system returns to service. The product dries to an inert film and does not enter occupied airspace after application. Call (571) 487-7204 for product sheets and an exact quote.
How long does UV light actually last?
The lamp emits effective UV-C for roughly 9,000 hours of operation, or about 12-18 months in a typical Herndon household. We note the install date on your job record and call when replacement is due.
Brands We Service in Herndon
We clean and service systems running Rotobrush, Honeywell, Aprilaire, and other major brands, and we stock common replacement parts for faster turnaround on repair calls. Our brands page lists full equipment compatibility.
Pricing for Air Duct Cleaning in Herndon, VA
| Service | Typical range in Herndon |
|---|---|
| Air duct cleaning (whole system) | $320 - $580 |
| Dryer vent cleaning | $140 - $240 |
| Duct repair & sealing (per section) | $180 - $420 |
| Evaporator coil cleaning | $180 - $340 |
| Blower cleaning | $140 - $260 |
| Full HVAC system cleaning | $380 - $620 |
| Mold treatment | $280 - $480 |
| UV-C light installation | $320 - $580 |
| Combined sanitizing package | $520 - $920 |
Prices in Herndon run higher than national averages when systems are in tight closet installations or when collapsed flex duct requires section replacement before cleaning can proceed. Every quote is a written flat price per system, agreed before work starts, under Haven Standard Clause 1. No per-vent pricing, no add-ons after arrival.
Neighborhoods We Serve in Herndon
We work across Herndon’s full residential map, from the historic downtown core to the planned townhome communities built during the Dulles Corridor expansion. Crews typically schedule within a few days for standard appointments.
- Historic Herndon (Elden Street / Spring Street area)
- Dranesville Town Center
- Franklin Farm
- McNair Farms
- Worldgate
Service Area - Cities Near Herndon
CleanRun crews serve homeowners throughout the Dulles Corridor and surrounding Northern Virginia communities. We regularly schedule work in Reston, VA, Great Falls, VA, Sterling, VA, and Chantilly, VA, with routing coordinated from our Washington, DC office to minimize drive time and keep appointments reliable.
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
Standard residential duct cleaning and HVAC maintenance do not require permits in Herndon. Duct replacement or structural modifications may need a Fairfax County permit if they alter the building envelope or electrical service. We flag permit needs during the estimate and handle the paperwork when required.
Standard appointments typically book within 3-5 business days. We do not maintain a same-day or emergency dispatch model - duct cleaning is a scheduled, documented job, not a rush repair - and we won’t promise speed we can’t deliver reliably.
Most Herndon townhome HOAs require 24-48 hour notice for service vehicles but do not restrict the work itself. We carry proof of insurance and background-check documentation for any HOA office that requests it, under Haven Standard Clause 3: Verified Crews.
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."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."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.