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 Sterling, VA
HVAC cleaning in Sterling typically runs $380-$620 for a whole-system job, with air quality and sanitizing services adding $180-$450 depending on whether mold treatment or UV installation is needed. In Sterling, the age of the housing stock changes everything - original flex-duct systems from the 1960s through 1980s trap debris differently than modern rigid ductwork, and the fine particulate from Route 28 corridor construction finds its way into attic runs with deteriorated insulation. We dispatch crews to Sterling from our Washington, DC office, and every job starts with a written price before any panel comes off. Call (240) 318-7712 for a free estimate.
Why Sterling Homes Are Different
Sterling Park, built from the mid-1960s through the early 1980s, holds some of Loudoun County’s oldest residential ductwork still in service. Original flex-duct runs in these homes pass through unconditioned attics where insulation has crumbled, exposing thin plastic liners to temperature swings that accelerate collapse and separation at joints. Our crews regularly find 1970s-era ductwork that has kinked or partially detached - not merely dirty, but structurally compromised.
The Route 28 Dulles Tech Corridor generates persistent fine particulate from constant commercial and data-center construction. This debris infiltrates aging residential systems through gaps that newer homes don’t have. Add Northern Virginia’s humid summers, with dew points in the low-to-mid 70s, and the conditions inside Sterling’s older duct runs become ideal for mold and mildew growth - especially where vapor barriers failed decades ago. Spring pollen from Loudoun’s dense oak and maple canopy adds a second annual contamination cycle when homeowners open windows during shoulder seasons.
Our Main Sterling Services
Most Sterling homeowners who call us need one of these three services, each with its own dedicated page.
Air Duct Cleaning in Sterling
We clean the full duct system - supply and return runs, trunk lines, and registers - using negative-pressure extraction (a sealed vacuum that pulls debris out without releasing it into your home). In Sterling Park homes, we often find original flex duct that has collapsed at elbows or separated at plenum connections, turning what looks like a standard cleaning into a cleaning-plus-repair conversation. Every run is photographed before and after. Air Duct Cleaning in Sterling covers the full scope.
Dryer Vent Cleaning in Sterling
Dryer vent blockages in Sterling’s older homes frequently involve foil or plastic transition ducts that violate current code and collect lint in ridges. We remove the material, inspect the full run to exterior termination, and photograph the interior condition. Cascades and Countryside homes with longer vent runs through finished basements are particularly prone to restricted airflow. Dryer Vent Cleaning in Sterling has full details.
Duct Repair & Sealing in Sterling
When our camera shows collapsed flex duct or separated joints in Sterling Park attics, sealing alone won’t suffice. We replace compromised sections with properly supported ductwork, seal all connections with mastic (a brush-applied sealant that outlasts tape), and pressure-test the repaired system. The photo record shows exactly what was replaced and what was sealed. Duct Repair & Sealing in Sterling explains the process.
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 Sterling
Whole-system HVAC cleaning in Sterling addresses the evaporator coil, blower assembly, and air handler - the components that move and condition air before it ever reaches your duct runs. In Sterling’s older homes, these components work harder because compromised ductwork leaks conditioned air into attics, forcing longer run times that deposit more debris on coils and blower fins. The humid summers accelerate biological growth on wet coils, while construction particulate from the Route 28 corridor coats blower assemblies in ways we rarely see in newer Loudoun County subdivisions. Our HVAC Cleaning hub explains our full approach.
Evaporator Coil Cleaning
Signs you need it
Ice buildup on refrigerant lines, weak airflow from registers, or a musty smell when the AC first cycles on.
What it costs in Sterling
Evaporator coil cleaning in Sterling typically runs $180-$320.
How we do it
We access the coil through the plenum (the main air distribution box), apply foaming cleaner, rinse with low-pressure water, and photograph the before and after condition through the access panel.
Blower Cleaning
Signs you need it
Uneven heating or cooling across rooms, a humming motor that struggles to reach set temperature, or visible dust puffing from registers at startup.
What it costs in Sterling
Blower assembly cleaning in Sterling typically runs $150-$280.
How we do it
We remove the blower housing, clean the squirrel-cage fan and motor housing with compressed air and contact cleaner, balance the assembly, and reinstall with a photo record of each stage.
What HVAC Cleaning Costs in Sterling
| Item | Typical range in Sterling |
|---|---|
| Evaporator coil cleaning | $180-$320 |
| Blower assembly cleaning | $150-$280 |
| Full HVAC system cleaning (coil + blower + air handler) | $380-$620 |
Why does my AC smell musty when it first turns on in Sterling?
Musty startup smells usually mean biological growth on the evaporator coil or in the condensate pan, common in Sterling’s humid summers where older systems run longer cycles. We clean the coil, treat the pan, and show you the photo record. Call (240) 318-7712 for a free estimate.
How do I know if my blower needs cleaning or replacement?
If the motor reaches full speed and airflow remains weak, the blower wheel is likely caked with debris - a cleanable condition. If the motor hums but won’t turn, the issue is mechanical failure requiring replacement. We diagnose before quoting, under Haven Standard Clause 1. Call (240) 318-7712 for a free estimate.
Air Quality & Sanitizing in Sterling
Air quality and sanitizing services in Sterling target the biological and particulate load that accumulates in aging duct systems - mold in damp attic runs, bacteria on debris-coated surfaces, and odors that persist after standard cleaning. The combination of 40-60-year-old flex duct and high humidity from Northern Virginia summers creates conditions where mechanical cleaning alone leaves live organisms behind. Our Air Quality & Sanitizing hub details the full protocol.
Mold Treatment
Signs you need it
Visible black or green growth on register surfaces, a persistent earthy smell, or allergy symptoms that worsen when the HVAC runs.
What it costs in Sterling
Mold treatment in Sterling typically runs $280-$450 per system.
How we do it
We apply an EPA-registered botanical fungistat to all interior duct surfaces using a fogging system, with dwell time documented by photo before the HVAC is returned to service.
UV Light Installation
Signs you need it
Recurring mold after professional cleaning, or a home with chronic moisture issues in the HVAC cabinet.
What it costs in Sterling
UV light installation in Sterling typically runs $380-$650 including the lamp and power supply.
How we do it
We mount a Honeywell or Aprilaire UV-C lamp in the supply plenum, wire to the air handler’s 24V circuit, and verify irradiance at the coil surface with a meter.
What Air Quality & Sanitizing Costs in Sterling
| Item | Typical range in Sterling |
|---|---|
| Mold treatment (whole system) | $280-$450 |
| Bacteria sanitizing | $180-$320 |
| UV light installation | $380-$650 |
Will mold come back after treatment in Sterling’s humidity?
Without addressing the moisture source, mold typically returns within 12-18 months. We identify the source - failed duct insulation, condensate drain issues, or cabinet leaks - and document it in your photo record. Call (240) 318-7712 for a free estimate.
Is UV light worth the cost versus regular cleaning?
UV-C lamps prevent biological growth on coils and in drain pans but do not remove existing debris; they’re most cost-effective when installed after a thorough cleaning, not as a substitute. We assess your system’s condition before recommending. Call (240) 318-7712 for a free estimate.
Brands We Service in Sterling
We stock parts and service equipment from Honeywell, Aprilaire, Abatement Technologies, and Guardsman - brands used in the professional duct cleaning trade, not consumer-grade alternatives. Most replacement components for Sterling systems are available same-day from our DC-area inventory. See our brands for the full roster.
Pricing for Air Duct Cleaning in Sterling, VA
| Service | Typical range in Sterling |
|---|---|
| Whole-system air duct cleaning | $320-$580 |
| Dryer vent cleaning | $120-$220 |
| Evaporator coil cleaning | $180-$320 |
| Blower assembly cleaning | $150-$280 |
| Full HVAC system cleaning | $380-$620 |
| Duct repair & sealing (per system) | $450-$890 |
| Mold treatment | $280-$450 |
| UV light installation | $380-$650 |
In Sterling, prices trend toward the higher end of these ranges when original flex duct requires partial replacement during cleaning, or when attic access is limited by finished ceilings. Every job is quoted with a written price before work begins - Haven Standard Clause 1 - and includes the Documented Photo Record as a standard deliverable.
Neighborhoods We Serve in Sterling
We work across Sterling’s full residential footprint, from original Sterling Park subdivisions to newer developments. Crews typically arrive within scheduled windows coordinated from our Washington, DC office.
- Sterling Park
- Cascades
- Countryside
- Dulles Town Center area
- Sugarland Run
Service Area - Cities Near Sterling
Our crews serve the full Loudoun-Fairfax corridor, including Herndon, VA, Reston, VA, Chantilly, VA, and Centreville, VA. Scheduling and dispatch are coordinated from our Washington, DC office, with local crews assigned to each job based on current routing.
Serving Sterling, VA - Our Local Coverage Area
We’re based in the Sterling 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 Sterling
Standard duct cleaning and sanitizing do not require permits in Loudoun County. Duct replacement that involves modifying the HVAC plenum or electrical connections may require a permit; we handle the determination and documentation as part of our scope. Call (240) 318-7712 for a free estimate.
Most Sterling Park HOAs do not restrict indoor duct cleaning, though some require notice for vans parked in shared areas. We carry general liability and workers’ compensation documentation and provide proof of coverage on request. Call (240) 318-7712 for a free estimate.
We serve the full Sterling mailing address area including unincorporated Loudoun County addresses near Route 28 and the Dulles corridor. If you’re unsure whether your address falls within our standard routing, call (240) 318-7712 and we’ll confirm before booking.
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 Sterling 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."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.