A few months ago, a family from the Plateau contacted us after noticing that their 6-year-old daughter had been coughing constantly ever since they moved into their townhouse.
They had tried everything: air purifiers, deep cleaning, and even changing the sheets every two days.
When we inspected their ventilation ducts with our camera, we found 12 years’ worth of dust buildup, construction debris from the previous renovation, and traces of mold caused by winter condensation.
In Montreal, townhouses—also known as row houses—make up a significant portion of the housing stock, especially in central neighborhoods. According to the APCHQ, approximately 15 to 20% of residential renovation budgets now include ventilation and air quality improvements.
But chimney maintenance is still not well understood. Here’s what you really need to know if you own or live in a townhouse in Montreal.
Why Townhouses in Montreal Are More Vulnerable
Townhouses have structural characteristics that create unique challenges for ventilation.
Winter Condensation and Shared Walls
A townhouse shares walls with its neighbors on either side. This creates some strange thermal dynamics.
In the winter, if your neighbor heats their home less than you do, the shared wall becomes a cold surface inside your home. The moisture in your indoor air condenses on this cold surface.
This condensation can seep into the walls and into ventilation ducts, which often run close to exterior and shared walls.
Approximately 40% of Montreal's townhouses were built before 1980, often with inadequate insulation and uninsulated metal ducts.
According to the INSPQ, buildings with poor ventilation may see their energy costs increase by 15 to 25% due to heat loss and system inefficiency.
Quebec's climate makes all of this worse. Our long winters with extreme temperature fluctuations (25°C inside, -25°C outside) create the perfect conditions for condensation if the ducts are dirty or poorly insulated.
Urban pollution and buildup in ducts
Montreal's townhouses are concentrated in dense urban neighborhoods—the Plateau, Hochelaga, Rosemont, and Villeray.
These neighborhoods have constant traffic. Fine particles, exhaust fumes, and urban dust—all of it enters your ventilation system.
Without proper filtration and regular cleaning, these contaminants build up in your ducts and are recirculated into the air you breathe.
Townhouses also often have narrow backyards wedged between buildings, which limits natural air circulation and concentrates local pollution.
What Is the Real Purpose of Duct Maintenance? (Facts vs. Myths)
There's a lot of misinformation out there about duct cleaning. Let's separate fact from fiction.
What Duct Maintenance Really Improves
Professional duct cleaning physically removes accumulated contaminants.
According to the NADCA, proper cleaning can remove up to 70% of particles and contaminants from the system.
This includes:
- Dust and debris
- Allergens (pollen, pet dander, dust mites)
- Mold spores
- Construction waste (plaster, sawdust)
- Dryer lint if the ducts are connected
For systems that are really clogged, cleaning can improve energy efficiency by 10 to 20%. Your furnace and air conditioner don't have to work as hard to push air through clean ducts.
It also reduces wear on mechanical components. A fan motor that has to work against excessive resistance will burn out faster.
Common Myths in Montreal
Myth #1: «You have to clean the ducts every year.»
False. For most well-maintained homes, a thorough cleaning every 3 to 5 years is more than enough.
Cleaning too often can even cause premature wear on the ducts if done aggressively.
Myth #2: «I can do it myself with a household vacuum cleaner.»
No. Residential vacuum cleaners do not have the power needed to create the negative pressure required to remove contaminants stuck to the walls.
You'll just be stirring up dust without actually cleaning anything. Worse, you risk damaging seals or disconnecting sections of ductwork.
Myth #3: «Cleaning solves all air quality problems.»
Not necessarily. If you have an active source of contamination—mold growth, water seepage, smoke—cleaning helps temporarily, but the problem will come back.
You should always fix the source of the problem at the same time as you clean the ducts.
When should you clean the vents in a townhouse?
There are times when it's clearly necessary, and others when it can wait.
Clear signs that cleaning is needed
Do you see visible mold inside the ducts or around the air vents? This is an urgent matter.
Persistent odors—musty, stale, or burnt—that keep coming back even after you've cleaned? They're probably coming from the vents.
Is there an excessive amount of dust settling everywhere a few days after you've cleaned? Your ventilation system is blowing out the accumulated dust.
Are occupants experiencing new or worsening respiratory problems—such as asthma, allergies, chronic cough, or eye irritation? If so, indoor air quality is likely compromised.
Have you recently done some renovations—demolition, sanding, painting? Construction debris has found its way into your ducts and must be removed before it is recirculated into the air.
Have you just bought a townhouse and aren't sure when the vents were last cleaned? Have them inspected to find out where you stand.
Recommended frequency in Quebec
The NADCA recommends cleaning every 3 to 5 years for a standard residential home.
For townhouses in Montreal, we recommend opting for a 3-year term because of:
- Higher levels of urban pollution
- Freeze-thaw cycles that cause condensation
- The average age of buildings
If you have pets, smokers in the house, or family members with severe allergies, it's best to have the house cleaned every 2 to 3 years.
The dryer vent, on the other hand, should be cleaned every year. It’s a matter of fire safety—lint buildup is a major cause of residential fires.
Check the condition of your ducts before winter — This is when your heating system is working the hardest.
How much does duct maintenance cost in Montreal?
Let's talk about money. You deserve to know what you're getting into.
Average Prices by Duct Type
For dryer vent cleaning in a townhouse, expect to pay between 120$ and 250$, depending on the length and accessibility.
This is an essential service that helps prevent fires. Lint builds up quickly, especially if your vent has bends or runs up several floors.
For a thorough cleaning of ventilation ducts—heating, air conditioning, and return air ducts—expect to pay between 500$ and 1,200$ for a typical 2- to 3-story townhouse.
This price normally includes:
- Initial camera inspection
- Cleaning all air vents
- Cleaning of Main and Branch Ducts
- Cleaning the plenum (the large box that connects the furnace to the ducts)
- Final Check
If your ducts haven't been cleaned in 15 or 20 years, the cost will likely be at the high end of the range because the job takes longer.
Why Townhouses Are Sometimes More Expensive
Access is often the main challenge.
In a townhouse, ducts often run from the basement up to the third floor through narrow spaces between the shared walls.
Getting onto the roof can be tricky if your house is in the middle of a row of 8 or 10 units. You can't just set up a ladder anywhere.
Ducts can also run through the attic, which is sometimes shared with neighbors or difficult to access.
All of this takes more time and sometimes requires specialized equipment, which affects the price.
At Vortex Air, we always provide a clear quote after a free inspection. You’ll know exactly how much it costs before we get started.
Get a clear price estimate for your townhouse — Call us for a no-obligation estimate.
Professional Methods vs. Risky Solutions
Not all duct cleanings are created equal. Far from it.
Recommended Method (NADCA)
The NADCA method—the only one truly recognized in the industry—uses what is known as «negative-pressure suction.».
Here's how it works:
A powerful industrial vacuum cleaner with HEPA filtration is connected to the main duct. It creates negative pressure throughout the system—air is drawn outside, never blown back into the house.
While the vacuum is running, rotating brushes and pneumatic beaters are inserted into each section of the duct to mechanically dislodge deposits stuck to the walls.
All the dirt—dust, mold, and debris—is vacuumed directly into the filter unit. Nothing gets scattered around your home.
When performed by trained technicians, this method truly cleans thoroughly without damaging the ducts.
Disinfection: Useful or Just a Marketing Gimmick?
Many companies offer «antimicrobial» or «disinfectant» treatments after cleaning.
The reality? It's rarely necessary and can sometimes even be counterproductive.
If your ducts are dry and clean after cleaning, bacteria and mold have nothing to grow on. Disinfection adds chemicals to your ventilation system without providing any real benefit.
On the other hand, if you’ve had a problem with active mold, an antimicrobial treatment may be part of the solution—but only after you’ve addressed the source of the moisture.
In Quebec's climate, with its dry winters and humid summers, the key is to control humidity, not to spray chemicals.
Take a look inside your ducts With our camera inspection—we'll show you exactly what's going on inside.
Regulations and Best Practices in Quebec
Residential ventilation in Quebec isn't heavily regulated, but there are still some standards you should be aware of.
What the law does not require… but recommends
In Quebec, there is no law requiring you to clean your ducts at a set frequency.
However, the RBQ (Régie du bâtiment du Québec) requires that all work on ventilation systems be performed by licensed contractors.
The INSPQ strongly recommends regular maintenance of ventilation systems to prevent health problems related to poor indoor air quality.
When it comes to dryer vents, it’s a matter of fire safety. Montreal’s fire departments regularly remind residents that accumulated lint is a major cause of residential fires.
Cleaning your dryer vent every year isn't just recommended—it's common sense to protect your family and your home.
If you are the owner-landlord of a townhouse, you are required to provide safe and sanitary housing. If a tenant can prove that poor air quality is affecting their health, you could face legal issues.
Why Choose Vortex Air Ventilation for Your Townhouse
Townhouses require a tailored approach. We know this because we work on them every week.
Transparent and Certified Methodology
We follow NADCA protocols for every procedure. Our team is INVC-certified and in the process of obtaining NADCA certification.
Our process is clear and simple:
- Free camera inspection We always start by inspecting your pipes with our inspection camera. You’ll see exactly what’s inside before we make any recommendations.
- Honest Assessment If your ducts are clean, we'll tell you straight up. We don't sell unnecessary services.
- Detailed Proposal You know exactly what's included, how much it costs, and how long it takes.
- Certified Cleaning We use professional-grade equipment—negative-pressure vacuuming, rotating brushes, and HEPA filtration. We don't cut corners.
- Final Check We'll show you the results with photos or videos. You'll see the before-and-after difference.
Local Experience with Townhouses
We've been working on Montreal townhouses for over 10 years—in the Plateau, Hochelaga, Rosemont, Villeray, and Petite-Patrie neighborhoods.
We're familiar with the typical scenarios: ducts that run up three stories, shared attics, difficult access points, and narrow spaces between shared walls.
Our team of more than five certified technicians has worked on hundreds of townhouses. We know how to work efficiently in these spaces without disturbing your neighbors.
Mohamed and Omar, our co-owners, personally oversee complex projects. You'll be speaking with the actual decision-makers, not with an employee who has no authority.
We're open 7 days a week, from 7 a.m. to 9 p.m., to accommodate your schedule.
Talk to a certified local specialist — Contact us at 514-214-7492 or visit vortexair.ca.
FAQ – Chimney Maintenance in Townhouses
How often should you clean the ducts?
For a townhouse in Montreal, we recommend a thorough cleaning every 3 to 5 years.
The dryer vent should be cleaned every year to prevent fires.
If you have pets, severe allergies in the family, or if you've just completed renovations, opt for the 3-year warranty.
Is this mandatory in Quebec?
No, there is no law requiring cleaning at fixed intervals.
However, if you are a landlord, you are required to provide safe and sanitary housing. Dirty vents that affect your tenants’ health could get you in trouble with the Régie.
Does it really reduce mold?
Yes, if there is mold in the ducts.
Cleaning physically removes mold spores and deposits. However, if the source of moisture—such as a leak, condensation, or water infiltration—is not addressed, the mold will grow back.
You should always address the moisture problem at the same time.
What is the difference between a single-family home and a townhouse?
Townhouses have shared walls that create cold thermal zones where condensation is more likely to accumulate.
Access to the ducts can also be more complicated due to the vertical layout across multiple floors and shared spaces.
The cost may be slightly higher due to these access challenges.
Cleaning Before Winter: Is It a Good Idea?
Yes, great timing.
Fall is the perfect time to have your ducts cleaned before your heating system runs at full capacity for six months.
Your ducts will be clean for the season when you need them most, and you'll maximize energy efficiency during the most expensive months.
How Can You Avoid Scams in Montreal?
Be wary of offers for 99$ to «clean everything.» It’s almost always a bait-and-switch tactic.
Check for certifications—INVC, NADCA, RBQ license. A reputable company can show you its accreditations.
Request a detailed written estimate after an inspection. We cannot provide a fixed price until we have assessed the actual condition of your ducts.
Read online reviews. Check Google, Facebook, and specialized websites.
If a company refuses to show you its certifications or pressures you to sign on the spot, walk away.
Conclusion — An Investment in Your Health and Well-Being
Your townhouse is likely your biggest investment. The air you breathe inside directly affects your health, your comfort, and your energy costs.
Clean, well-maintained ducts protect you from mold, reduce allergens, improve the efficiency of your heating system, and extend the life of your equipment.
It's not an expense—it's an investment in your quality of life.
At Vortex Air, we’ve been helping Montreal families breathe easier for over 10 years. We understand townhouses because we work in them every week.
If you're not sure what condition your ducts are in, we can give you a clear and honest answer after a free inspection.
Contact us at 514-214-7492—we're available 24/7—or visit vortexair.ca to schedule your inspection.
Because a healthy home starts with the air we breathe.
