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
AfterFull System Cleaning in Herndon, VA
Full system cleaning covers every component air actually touches inside your HVAC system: supply ducts, return ducts, the air handler cabinet, blower assembly, evaporator coil, and all registers and grilles. In Herndon, where homes commonly run their systems eight to nine months a year due to the region’s humidity-heavy summers and cold-snap winters, that continuous use pushes debris deep into the ductwork well past what a standard register cleaning ever reaches. A typical full system job with CleanRun takes three to five hours and is priced in writing before a single panel comes off – no estimates by phone, no surprises on the invoice.
This page is part of our Air Duct Cleaning in Herndon service, which covers everything from basic supply-line cleaning to the complete system work described here. If you’re comparing quotes or just want a written number before committing to anything, call (571) 520-6317 – a live person answers every call.
When You Need Full System Cleaning
Not every home needs a full system cleaning every year. But certain situations make a partial cleaning almost pointless – if the blower wheel or evaporator coil is contaminated, cleaning the duct runs alone just circulates the problem. Here’s what typically signals that a full system approach is the right scope:
- Visible dust discharge within minutes of startup. If you can see particulate blowing from registers shortly after the system kicks on, the debris is already in the air handler – not just sitting in a distant duct run. In older Herndon split-levels and colonial-style homes with long horizontal duct runs, this pattern appears frequently.
- Musty or sour odors that don’t clear after a filter change. Odor that persists past a fresh filter almost always lives on the evaporator coil or in the drain pan – both components that only a full system cleaning addresses. Herndon’s summer humidity makes coil contamination more common here than in drier climates.
- A home purchased without service records. If you bought your home between 2015 and 2025 and have no documentation of prior duct or HVAC cleaning, you have no way to know what’s inside the system. Our pre-cleaning camera inspection often finds three to five years of compacted debris at the first elbow off the air handler in homes that were “maintained” by previous owners.
- Recent renovation or construction dust. Drywall dust, insulation fibers, and wood particulate are dense enough to coat coil fins and clog blower wheels. In Herndon’s Franklin Farm, Worldgate, and Cascades neighborhoods, we see this regularly after kitchen or basement remodels.
- Allergy symptoms that worsen indoors. When a household member has documented allergies and indoor air quality is clearly below outdoor air quality, the problem is usually systemic – the coil and blower assembly are the reservoirs, not just the ducts.
- A system running longer cycles to reach set temperature. A blower wheel coated in debris moves less air per revolution. If your system is running noticeably longer than it did two years ago and mechanical inspections have come back clean, restricted airflow from contamination is a plausible cause.
Our Full System Cleaning Process
Every full system cleaning follows the same documented sequence. We photograph each component before we touch it, work through the system in a specific order that prevents cross-contamination, and photograph again after. The photo record is delivered to you as a standard part of the job – not an add-on.
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Written scope and price, signed before work begins.
The technician walks the system, counts duct runs, inspects accessible components, and produces a written price. That number does not change once work starts. This is Haven Standard Clause 1 – upfront pricing is not optional at CleanRun, it is the first documented step on every job, on every visit in Herndon or anywhere else we work. -
Pre-cleaning camera inspection and photo documentation.
Before negative-pressure extraction begins, we run a camera through each duct run from the register end and document what’s inside. “Negative-pressure extraction” means the system is placed under suction – think of it as a controlled vacuum that pulls debris toward a collection point rather than pushing it through the house. The pre-cleaning images are timestamped and included in your job record. Tomas Reyes implemented this documentation standard when CleanRun took its first job in 2013, and it has not changed since. -
Negative-pressure extraction with agitation on supply and return ducts.
We connect a Nikro or Rotobrush negative-air machine to the main trunk line, seal off registers with cover plates, and work each duct run individually. Agitation tools – rotary brushes sized to the duct diameter – break compacted debris loose so extraction actually removes it rather than just disturbing it. Duct runs are photographed after each one is cleared. -
Blower assembly cleaning.
The blower wheel – the fan inside the air handler that moves air through your entire system – accumulates a layer of debris that reduces airflow measurably over time. We remove the wheel where access allows, clean it to bare metal, and document the before and after condition. This step is what separates a full system cleaning from a duct-only cleaning. -
Evaporator coil cleaning and drain pan inspection.
The evaporator coil sits in the air stream and is the first surface airborne particulate contacts when it bypasses the filter. We clean the coil face, inspect the drain pan for biological growth, and flush the condensate drain. In Herndon, where the system pulls humid outdoor air from April through October, the coil and drain pan are almost always the dirtiest components in the system. -
Post-cleaning verification and photo record delivery.
After all components are cleaned and reassembled, we run the system, confirm airflow at each register, and compile the complete before-and-after photo record. You receive that record before we leave – not in a follow-up email three days later. If anything in the post-cleaning images doesn’t match the written scope, we make it right under the 365-Day Done Right Promise, backed in writing on every job.
BeforeAfterFull System Cleaning Pricing in Herndon
Full system cleaning in Herndon runs between $449 and $899 for most single-family homes, with the final written price determined before work begins. The range exists because system size, accessibility, and contamination level vary significantly house to house – not because we adjust pricing based on what we think you’ll accept.
Here’s what actually moves the price inside that range:
- Number of duct runs: A typical Herndon townhouse in the Worldgate area might have 10 to 14 supply registers. A larger single-family home in Fox Mill Estates might have 20 or more. Each run is photographed and cleaned individually, so more runs means more documented work and a higher price.
- Blower wheel removal access: Some air handlers allow full blower wheel removal for cleaning; others require cleaning in place due to cabinet design. In-place cleaning takes longer. The technician notes this in the written scope before quoting.
- Evaporator coil condition: A lightly soiled coil cleaned with a standard foaming agent takes 20 to 30 minutes. A coil with heavy biological buildup or debris compacted between fins takes longer and may require a secondary treatment. Both are documented in photos so you can see exactly what was there.
- System configuration – single vs. dual zone: Homes in Herndon’s newer subdivisions near Floris Road and the Herndon Parkway corridor often have two-zone systems with separate air handlers. A dual-zone full system cleaning is priced separately per handler.
There is no “call for a quote” here. When you call (571) 520-6317, we schedule an on-site assessment and produce a written number. If you’ve already received a written estimate from another company, we’ll put our number next to it in writing at no cost – that’s the Free Second Opinion, available on any documented estimate.
FAQs – Full System Cleaning
How is full system cleaning different from standard duct cleaning?
Full system cleaning includes the air handler cabinet, blower assembly, and evaporator coil in addition to the supply and return duct runs. Standard duct cleaning covers only the duct runs and registers. The distinction matters because a contaminated blower wheel or coil re-contaminates clean ducts within one heating or cooling season – cleaning the ducts without addressing those components is a short-term fix. When you look at our before-and-after photo record, the blower wheel and coil images usually show the highest contamination levels in the system, which is why we include them in the full scope. Call (571) 520-6317 to get a written price for the scope that fits your system.
How much does full system cleaning cost in Herndon?
Full system cleaning in Herndon is priced between $449 and $899 for most single-family homes, written before work begins. The primary variables are number of duct runs, blower wheel accessibility, and coil condition. Dual-zone homes with two air handlers are priced per handler. There are no phone quotes at CleanRun – the written price comes after the on-site assessment, which is how we keep that number accurate. Call (571) 520-6317 to schedule an assessment and get your written price.
How long does a full system cleaning take?
Most full system cleanings in Herndon take three to five hours. A smaller townhouse with one air handler and 12 duct runs typically finishes closer to three hours. A larger home with 20-plus runs, a heavily soiled coil, and restricted blower access can run to five. The technician gives you a time estimate in the written scope before starting, so you know how long to plan for. We don’t leave until the post-cleaning photo record is compiled and the system is running – you’re not handing us the job on faith.
Is full system cleaning safe for older ductwork in Herndon homes?
For most ductwork, yes – negative-pressure extraction and rotary brush agitation are standard NADCA-referenced practices and don’t stress intact duct material. The exception is flex duct that is already compromised: torn inner liner, collapsed sections, or joints that have separated. Our pre-cleaning camera inspection flags those conditions before we start, and if we find a duct run that shouldn’t be agitated, we note that in writing and present a repair option alongside the cleaning scope. Herndon has a significant stock of homes built in the 1980s and 1990s with original flex duct that can be in variable condition – the inspection step exists precisely to find that before it becomes a problem during the job. See our broader home page for the full scope of what CleanRun covers, including duct repair. Call (571) 520-6317 if you have a specific concern about an older system – we’d rather answer that question before the truck rolls than after.
What You Receive When the Job Is Done
Documentation is not a differentiator we invented to sound different from other companies. It’s the only thing that separates real work from theater. When a CleanRun technician finishes a full system cleaning in Herndon, you receive:
- Timestamped before-and-after photographs of every duct run, the blower assembly, and the evaporator coil – every image labeled by location in the system.
- The original written scope with the written price, signed before work began, so the two documents match and you can verify the work against the scope.
- The 365-Day Done Right Promise in writing – if the work isn’t right, CleanRun makes it right, without requiring manager approval or a specific complaint format.
- A signed record of the technician’s name and background-check status under Haven Standard Clause 3, Verified Crews.
CleanRun has held this documentation standard since its first job in 2013 and has applied it across more than 52,000 homes served. Every one of those jobs started with a written price and ended with a photo record. That’s not a policy subject to change based on the size of the job.
Why Herndon Homes Specifically Benefit from Full System Cleaning
Herndon sits in a climate band that pushes HVAC systems hard in both directions. Summer humidity from June through September means evaporator coils are shedding condensate for months at a stretch, creating exactly the damp-surface conditions where biological material accumulates. Winter cold snaps – especially the below-freezing stretches that hit the Herndon area in January and February – mean the system flips to heating and the blower runs continuously for days. That back-and-forth cycle compacts debris in ways that a system running only in one mode doesn’t see.
The local housing stock adds to this. Herndon has a large number of homes built between 1985 and 2002 in developments like Fox Mill, Bryson, and the areas off Elden Street and Herndon Parkway. Many of those homes still have their original flex duct, original air handlers, and – in some cases – original blower wheels that have never been removed and cleaned. When our camera goes into a system like that, a 3-inch debris layer at the first elbow is not unusual. That’s what the photo shows. That’s what the job addresses.
If your home is in this range – purchased with incomplete service records, built before 2002, or showing any of the symptoms listed above – a full system cleaning is the scope that actually addresses the problem. A partial cleaning in a system like that is documented work on the wrong components.
Schedule a Full System Cleaning in Herndon
Call (571) 520-6317 to book an on-site assessment. A live person answers every call – no voicemail queue, no callback system. The assessment results in a written price before work begins, and the job ends with a complete photo record and the 365-Day Done Right Promise in writing. If you have a written estimate from another company, bring it – we’ll put our number next to it at no cost. Tomas Reyes and the CleanRun team have been documenting this work in Herndon since 2013, and every job looks the same on paper when it’s done right.
Written by Tomas Reyes, Owner at CleanRun Air Duct Cleaning Herndon, serving Herndon.