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
AfterAir Duct Cleaning in Belmont, MA
Dryer vent cleaning in Belmont is a different job than it is ten minutes east on the bay plain, because the fog that banks against the Belmont Hills keeps crawl spaces damp for months at a time. Homes along the Ralston Avenue corridor were mostly built between the 1950s and 1970s, and many still run their original sheet-metal ductwork through unconditioned spaces that never fully dry out. That combination, persistent coastal humidity plus aging duct runs, means lint and dust inside Belmont ductwork often convert to something stickier and harder to remove than in neighboring cities. Call (806) 606-6902 and we’ll put a written price in front of you before any panel comes off.
Why Belmont Homes Are Different
Belmont sits at the base of the Coast Range where the marine fog layer presses against the hills and lingers. That produces sustained near-100% relative humidity inside unconditioned attics and crawl spaces, which changes how ductwork behaves here. Flatland homes along the Ralston Avenue corridor are largely 1950s-1970s post-war tract ranches, many with original sheet-metal ducts or early flex duct that has lost its insulation value over fifty-plus years of fog cycles. Hillside properties above Belmont Avenue tend to be custom builds with non-standard, multi-level duct routing through tight crawl spaces that complicate access and inspection.
We regularly find condensation inside duct runs in Belmont, particularly in the hillside neighborhoods where ductwork crosses between heated interior spaces and cold, fog-saturated crawl spaces. That condensation causes liner delamination in older flex duct, a failure mode that recurs seasonally even after cleaning if the duct is not properly re-insulated and sealed. One finding we see in Belmont hillside homes and almost never in flatland San Carlos: a duct run passing through the downhill crawl space of a split-level will be heavily colonized with mold while the uphill side of the same system tests clean. That’s a condensation gradient driven by the fog-to-warm-interior temperature differential, and it’s a Belmont signature.
Our Main Belmont Services
Most Belmont homeowners call us first about two things: the air ducts that move heated and cooled air through the house, and the HVAC system that conditions it. Here’s what each involves in this town.
Air Duct Cleaning in Belmont
Full-system air duct cleaning in Belmont means pulling the registers, running negative-pressure extraction through every duct run, and photographing the interior of each run before and after. In Belmont specifically, we pay close attention to runs that pass through fog-exposed crawl spaces, because that’s where condensation has most likely turned dust into a biofilm that a standard vacuum pass won’t remove. We document every run. Read the full breakdown on our Air Duct Cleaning in Belmont page, including written price ranges and what the photo record includes.
HVAC Cleaning in Belmont
HVAC cleaning in Belmont addresses the blower, coils, and plenum, the components that move air and the surfaces where moisture collects. In fog-heavy Belmont, the evaporator coil is the part we watch most closely; sustained humidity means it rarely runs dry, and that’s where mold colonizes first. We clean the full air handler and document what we find with photos. See the full scope and pricing on our HVAC Cleaning in Belmont page.
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.
BeforeAfterDryer Vent Cleaning in Belmont
Dryer vent cleaning in Belmont is a job shaped by housing age and fog. Most homes here were built between the 1950s and 1970s, which means long vent runs, often through crawl spaces or attics, with elbows and joints that have been collecting lint since the Nixon administration. The fog that sits against the Belmont Hills keeps that lint damp, and damp lint compacts instead of blowing through; it clings to the vent walls and obstructs airflow far faster than the dry, dusty lint we see in bay-plain homes. This is also why we treat dryer vent cleaning in Belmont as a fire-safety job first, because a restricted vent pushes dryer exhaust temperatures up quickly. Our full Dryer Vent Cleaning service includes a camera record of the inside of the vent run before and after, so you can see the difference. Tomas Reyes oversees every Belmont job and signs off on the photo record before it’s delivered.
Dryer Vent Inspection
Signs you need it
The dryer takes longer than 45 minutes to dry a normal load, or the laundry room feels humid while the dryer runs.
What it costs in Belmont
A camera-only dryer vent inspection in Belmont runs $75-$150.
How we do it
We run a camera through the full vent run from the dryer to the exterior termination, recording every elbow, joint, and obstruction.
Vent Cleaning
Signs you need it
The exterior vent flap doesn’t open fully when the dryer runs, or you can see lint built up at the termination point.
What it costs in Belmont
Full dryer vent cleaning in Belmont typically costs $149-$289, depending on run length and access.
How we do it
We run a rotary brush and HEPA-filtered negative-pressure extraction through the full vent run, then re-camera to document the result.
Vent Rerouting
Signs you need it
The current vent run exceeds 25 feet in effective length, has more than two elbows, or terminates under a deck or into a crawl space.
What it costs in Belmont
Dryer vent rerouting in Belmont ranges $275-$650, depending on run length and exterior access.
How we do it
We design a shorter, straighter run to the nearest exterior wall, install rigid metal duct, and seal every joint with mastic.
What Dryer Vent Cleaning Costs in Belmont
| Item | Typical range in Belmont |
|---|---|
| Dryer vent inspection (camera) | $75-$150 |
| Full dryer vent cleaning | $149-$289 |
| Dryer vent rerouting | $275-$650 |
How often should a dryer vent be cleaned in Belmont?
Every 12 months at minimum. Belmont’s fog keeps lint damp and compacted, which restricts airflow faster than in drier neighboring cities. A household running four or more loads a week should plan for twice-yearly cleaning.
Does the fog in Belmont actually make dryer vents clog faster?
Yes. Moist lint compresses and clings to the vent walls instead of blowing through. That’s a Belmont-specific condition we document on every job with before and after photos. Call (806) 606-6902 for an exact quote.
Duct Repair & Sealing in Belmont
Duct repair and sealing in Belmont is most often a fog-condensation problem before it’s anything else. The marine layer that parks against the Belmont Hills keeps crawl spaces and attics at near-100% relative humidity for months, which attacks old duct sealant and causes liner delamination in aging flex duct; what starts as a small leak at an elbow can pull humid, mold-laden crawl space air into the duct stream all summer. In 1950s-1970s Belmont tract homes along Ralston Avenue, we regularly find original sheet-metal joints held together with dried-out duct tape and hardened mastic, both of which have failed. Our Duct Repair & Sealing service addresses leaks, failed insulation, and collapsed runs, with a written price before we start and a photo record when we finish.
Duct Sealing
Signs you need it
Rooms at the end of long duct runs are noticeably warmer or cooler than the rest of the house, or your energy bill has risen without a change in usage.
What it costs in Belmont
Duct sealing in Belmont typically runs $450-$1,400 for a full system, depending on the number of accessible runs.
How we do it
We locate leaks with a pressure test, then seal every joint and seam with UL 181 mastic and aluminum tape.
Flex Duct Repair
Signs you need it
The outer vapor barrier of a flex duct is torn or the inner liner has delaminated, which shows up as visible sagging in crawl space runs.
What it costs in Belmont
Flex duct repair in Belmont runs $350-$1,200 per affected run, including new insulation and supports.
How we do it
We cut out the damaged section or replace the full run, then hang it with proper supports and seal the connections with mastic.
Duct Insulation
Signs you need it
Ducts run through unconditioned attics or crawl spaces and the insulation jacket is compressed, mold-stained, or missing in sections.
What it costs in Belmont
Duct insulation in Belmont runs $400-$1,500, depending on linear footage and whether the old insulation must be removed first.
How we do it
We strip failed insulation, wrap the duct in new R-6 or R-8 insulation, and seal the vapor barrier at every seam.
What Duct Repair & Sealing Costs in Belmont
| Item | Typical range in Belmont |
|---|---|
| Duct sealing (full system) | $450-$1,400 |
| Flex duct repair (per run) | $350-$1,200 |
| Duct insulation | $400-$1,500 |
Why do ducts in Belmont leak at the joints so often?
The sustained fog humidity attacks mastic and tape over years, hardening and cracking the sealant. It’s a recurring condition, not a one-time failure. Sealing with UL 181 mastic addresses the joints permanently. Call (806) 606-6902 for a written Belmont quote.
Can you repair the downhill crawl space side only?
Yes. We routinely find the fog-exposed downhill side of a Belmont split-level system heavily affected while the uphill side is sound. We price the affected runs only, with a photo record backing up the scope.
Air Quality & Sanitizing in Belmont
Air quality and sanitizing in Belmont means treating the microbial growth that Belmont’s persistent fog makes almost inevitable inside ductwork. When marine layer humidity sits at near-100% for months, dust trapped on the interior of duct runs becomes a substrate for mold and bacteria, and that’s what recirculates through the house every time the blower kicks on. Hillside and flatland Belmont homes alike have the problem, but hillside homes with duct runs through the downhill crawl space are the worst cases we see; the temperature differential between fog-chilled crawl space and warm interior creates constant condensation inside the duct. Our Air Quality & Sanitizing service documents every finding with photos and leaves the system with a written record of what was applied and where.
Mold Treatment
Signs you need it
Musty odor comes from the registers when the HVAC runs, or a camera inspection shows visible mold on duct interior surfaces.
What it costs in Belmont
Mold treatment in Belmont costs $650-$2,200, depending on the number of affected runs and the product required.
How we do it
We remove the contaminated material, apply an EPA-registered antimicrobial to the affected surfaces, and document every step in the photo record.
Odor Removal
Signs you need it
There is persistent cooking, pet, or musty odor in the house even after cleaning, and the smell intensifies when the blower runs.
What it costs in Belmont
Odor removal in Belmont costs $350-$900, depending on system size and whether the plenum needs treatment.
How we do it
We fog the full duct system with a neutralizing treatment, then run the blower to distribute it and re-camera the interior.
UV Light Installation
Signs you need it
The evaporator coil shows recurring mold growth, or someone in the house has year-round respiratory symptoms that worsen when the HVAC runs.
What it costs in Belmont
UV light installation in Belmont runs $800-$1,800, including the unit, mounting at the coil, and electrical connection.
How we do it
We mount a UV-C unit at the evaporator coil with a sight glass for maintenance, then verify operation and document the install.
What Air Quality & Sanitizing Costs in Belmont
| Item | Typical range in Belmont |
|---|---|
| Mold treatment | $650-$2,200 |
| Odor removal | $350-$900 |
| UV light installation | $800-$1,800 |
Why does mold inside ducts keep coming back in Belmont?
Because the fog keeps the crawl space humid enough that condensation returns even after cleaning. The fix has to combine mold treatment with re-insulation and sealing of the duct runs, or the problem will recur. Call (806) 606-6902 for a written quote.
Is the sanitizing agent safe for kids and pets?
Yes. We use EPA-registered products applied at manufacturer-labeled concentrations, and we document which product was used on the written work order. The home can be occupied during and after treatment. Our Air Quality & Sanitizing page has more on the specific products we use.
Brands We Service in Belmont
We stock parts and consumables for Rotobrush, Nikro, and Abatement Technologies systems, the professional-grade equipment most commonly installed in Belmont homes. Replacement filters, UV bulbs, and antimicrobial treatments for these systems are available locally, and most orders arrive at our Boston office next business day.
Pricing for Air Duct Cleaning in Belmont, MA
| Service | Typical range in Belmont |
|---|---|
| Dryer vent inspection (camera) | $75-$150 |
| Full dryer vent cleaning | $149-$289 |
| Dryer vent rerouting | $275-$650 |
| Duct sealing (full system) | $450-$1,400 |
| Flex duct repair (per run) | $350-$1,200 |
| Duct insulation | $400-$1,500 |
| Mold treatment | $650-$2,200 |
| Odor removal | $350-$900 |
| UV light installation | $800-$1,800 |
| Dryer vent inspection (camera) | $75-$150 |
What pushes a Belmont price toward the top of a range is access: hillside crawl spaces, long vent runs, and original 1950s ductwork that needs more labor per linear foot. Every job gets a written price before any work starts, under Haven Standard Clause 1, so the number on the page is the number on the invoice.
Neighborhoods We Serve in Belmont
We schedule Belmont jobs every weekday, and our crews move through the following neighborhoods regularly:
- Ralston Avenue corridor
- Belmont Hills
- Carlmont area
- Baywood
- Hillside above Belmont Avenue
Most Belmont appointments are booked within a week, and we always confirm a written price before the crew arrives.
Service Area - Cities Near Belmont
We serve Belmont and the surrounding Peninsula and metro Boston communities. For homeowners in Watertown, MA, Arlington, MA, Cambridge, MA, and Newton, MA, we provide the same written upfront pricing and documented photo record on every job.
Serving Belmont, MA - Our Local Coverage Area
We’re based in the Belmont 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 Belmont
No. Routine cleaning, sanitizing, and sealing of existing ductwork does not require a permit in Belmont. If a repair involves replacing an entire HVAC system or altering gas lines, the HVAC contractor on that job would handle permitting separately.
Most Belmont appointments are scheduled within five to seven business days. You will get a specific arrival window and a written price before the crew pulls up. Call (806) 606-6902 to schedule.
Yes. Those homes have the most complex duct routing in Belmont, and our crews work in those crawl spaces regularly. The written price reflects the access difficulty, so there are no surprises when the invoice arrives.
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 Belmont Customers Say
"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."The dryer vent was almost completely blocked with lint. They showed me the photograph and I understood immediately why the dryer had been running twice."
- Lucia M."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.