Part of our heating and cooling services.
Short answer
Be sceptical of duct cleaning as a routine purchase and take it seriously in specific cases: visible debris, evidence of rodents, water damage or mould, or construction dust after a renovation. General air-quality improvement is a weaker reason, and it is frequently how the service is sold. The distinction is worth holding because the specific cases are real and the general claim is not well supported.
If one of the specific reasons applies, the job is worth doing properly, not cheaply. Ask what equipment is used, whether every branch and the return side are included or only the visible trunks, whether the blower and coil are cleaned as well, and what the technician expects to find given the reason you called.
Jobs this covers
- Supply and return duct cleaning
- Register and grille cleaning
- Blower and accessible air-handler cleaning
- Post-construction HVAC cleaning
- Coil and drain-pan coordination
- Before-and-after condition documentation
Common problems and warning signs
- Debris is visible inside accessible ducts
- Construction dust entered the system
- Material blows from registers
- A pest or water event affected ductwork
- The blower or cabinet has heavy buildup
- A property transfer calls for documented condition
What service may include
Registers are covered while ducts are cleaned. Real scope only shows up on the visit. A complete scope should identify the duct sections, registers, returns, blower, accessible cabinet components, containment method, equipment used, protection of occupied space and any components that cannot be safely cleaned.
What affects the recommendation and price
Mold findings add remediation steps. System size, number of returns and registers, duct material, access, contamination type, rooftop or attic equipment, occupied-space protection and whether repairs are needed affect scope and price.
What is different around Burlington
A reasonable company will look first and show you what it found, instead of quoting a whole-house clean before anyone has opened a register.
What a written quote should tell you
- What was actually found in the ducts, ideally with images, before work was recommended
- The method used, and whether every branch is cleaned or only the main trunks
- Whether the air handler, coil and blower are included or only the ducts
- Whether any sealing or chemical treatment is proposed, and the case for it
- Whether an underlying cause, a leak, an entry point, a filtration gap, was identified
| Reason | Case strength |
|---|---|
| Visible debris, rodents, water damage, mould, or post-renovation dust | Real, worth doing properly |
| General air-quality improvement | Weak, the most common way the service is oversold |
Safety comes first
Suspected asbestos, mold, sewage, lead dust or other hazardous contamination requires the appropriate assessment and containment plan before ordinary duct cleaning. Cleaning is not a substitute for correcting a moisture or filtration problem.
Common questions
Should the blower and air handler be included?
The written scope should say which components are included. Cleaning only visible registers is not the same as cleaning the accessible HVAC system.
Can flexible duct or internally lined duct be cleaned?
The material and condition determine the safe method. Damaged or contaminated lining may require repair or replacement instead.
Should I receive before-and-after documentation?
For a substantial cleaning project, photographs or other condition documentation can make the completed scope easier to verify.
What does NADCA certification mean?
The National Air Duct Cleaners Association sets a standard for how duct cleaning should be performed and certifies companies and technicians against it: source removal under negative pressure, cleaning the whole system including the coil and the blower instead of only the registers, and inspection before and after. It is a trade association, not a regulator, so certification is not a licence, but in a service with a well-earned reputation for low-price bait advertising it is one of the few available filters. Asking whether the quoted price covers the entire system, including the air handler, separates the real work from the rest.
How do I know if my ducts actually need cleaning?
Look before you buy. Take a register cover off and shine a light and a phone camera into the duct: you will see either a light film of dust, which is normal and harmless, or visible accumulation, debris, or growth, which is not. Ask any company proposing the work to show you inside your own ducts before and after, with a camera. Be sceptical of before-and-after photographs that are not clearly of your system, which is a documented pattern in this particular trade.
Can I clean my own ducts?
You can do the part that matters most and is most often skipped: pull the register covers, vacuum as far into each boot as the hose reaches, and clean the return grilles, which collect far more than the supplies do. That handles the visible dust that gets blown around a room. What a homeowner cannot do is clean the trunk lines and the far reaches of the system, which needs a truck-mounted vacuum with the system under negative pressure while agitation tools work the interior, and that is also the part that most rarely needs doing.
What happens if ducts are genuinely dirty and never cleaned?
Honestly, in most houses, very little, and this is a service where the honest answer is worth more than an upsell. The EPA's position is that routine duct cleaning has not been shown to prevent health problems, and dust settled on the inside of a duct largely stays there. The circumstances where it does matter are specific: visible mould growth inside the ducts or on the coil, vermin infestation, or substantial debris from construction or a fire. Those are real reasons. General dustiness usually is not, and is more often a filtration or duct-leakage problem.
How often should ducts be cleaned?
There is no established interval, and the frequent claim of every three to five years does not come from any standard: the EPA explicitly declines to recommend routine cleaning. Clean when there is a reason: after major renovation or construction, after water intrusion, after a rodent problem, or when a visual inspection shows something. If a company quotes a routine interval and a low headline price, ask what the price includes, because whole-system cleaning done properly is neither quick nor cheap and the low-price version is often a few registers and a sales visit.
Is duct cleaning a landlord's responsibility?
There is no general requirement to clean ducts in a Vermont rental, and it would not usually be a habitability question. Where it changes is if there is mould growth or vermin in the system: mould in a dwelling and pest infestation both engage a landlord's obligation to maintain a fit and habitable unit, and the ducts being the location does not change that. Document what you can see, report in writing, and ask specifically for an inspection rather than for cleaning, because the inspection determines what is actually needed.
Is duct cleaning warrantied?
There is little to warranty in duct cleaning itself, since it is a one-time service rather than an installed product. What a reputable company will stand behind is that the whole system, including the air handler and coil, was actually cleaned as scoped, not just the visible registers.
What is the most common mistake buying duct cleaning?
Buying a low-priced whole-house cleaning without confirming what is actually included. A price that sounds too good for a full system is frequently a few registers and a sales visit instead of genuine source removal of the trunk lines and air handler.