A hidden world inside your ventilation system silently threatens your comfort and health
At AirGreen, we understand that indoor comfort isn't just about temperature. A clean and healthy ventilation system is essential to maintaining excellent air quality, especially in urban environments like Montreal, Laval, Longueuil, the North Shore and South Shore. What you can’t see can seriously harm your well-being: mold, built-up dust, invisible bacteria, and other microorganisms often thrive in neglected air ducts.
Wall-mounted air conditioners, central heat pumps, and heat recovery ventilation systems (HRVs) are particularly vulnerable. Humidity, temperature fluctuations, and stagnant air create the perfect environment for bacterial and fungal growth when HVAC maintenance is overlooked.
Why your ventilation system becomes a haven for contaminants
Every day, ambient air carries microscopic particles that enter your ventilation system. Fine dust, pollen, mold spores, dust mites, pet dander, and other allergens gradually accumulate. Without regular HVAC cleaning, these substances become a toxic cocktail that gets recirculated throughout your home or business.
We see this frequently in residential neighborhoods in Laval and commercial buildings in downtown Montreal, where systems are sometimes neglected for several years.
The warning signs of a contaminated system
A dirty HVAC system won’t scream for help, but the signs are definitely there:
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Persistent or foul odors when turning the system on.
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Unexplained allergies or irritation (itchy nose, coughing, headaches).
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Dark stains near vents or air outlets.
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Reduced system performance despite normal energy usage.
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Excess humidity in certain rooms.
We often encounter these symptoms during service calls in condos and townhomes across the South Shore, where air quality issues are more common than one might think.
Real example: ductwork cleaning in a contaminated system in Brossard
Recently, our team intervened in a family home in Brossard where the residents complained of persistent odors and allergy symptoms. After a thermographic inspection and vent analysis, we discovered a significant buildup of mold inside the central ventilation ductwork. Moisture from a poorly calibrated HRV was encouraging microbial growth.
We performed:
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A complete mechanical cleaning of the ducts using a rotating brush system.
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High-powered HEPA vacuuming to capture spores.
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Disinfection using a certified biodegradable product safe for children and pets.
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Adjustment of the HRV airflow to prevent condensation inside the ducts.
The result: occupants reported all symptoms disappeared, ambient odors improved drastically, and the system was back to full efficiency.
What types of contaminants hide in HVAC systems?
Here’s an overview of the main invisible threats:
| Contaminant | Common Source | Impact on Health |
|---|---|---|
| Mold | Stagnant humidity | Allergies, asthma, respiratory infections |
| Dust | Outdoor infiltration, carpets | Irritation, reduced air quality |
| Bacteria | Condensation, moisture, dirty filters | Headaches, nausea, chronic fatigue |
| Allergens | Pets, pollen | Allergic reactions |
| Debris | Renovation dust, materials | System blockage, loss of efficiency |
HVAC cleaning: an essential service for your health
At AirGreen, we don’t consider HVAC cleaning optional—it’s an essential preventive maintenance step. We provide service across the greater Montreal area, including Longueuil, Laval, Repentigny, Terrebonne, Saint-Hubert, Boisbriand, Saint-Jérôme, Boucherville, and more, with a personalized and meticulous approach.
Our services include:
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Visual inspection using HD cameras inside the ductwork.
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Air quality analysis before and after the job.
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Thorough cleaning of ducts, air vents, filters, and indoor/outdoor units.
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Disinfection of internal surfaces as needed.
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Practical recommendations to avoid future contamination.
How often should HVAC cleaning be done?
The frequency depends on the type of building, system installed, and lifestyle habits. Here are some guidelines:
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Homes with pets and children: every 2 to 3 years.
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Offices or commercial spaces: every 1 to 2 years, depending on use.
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Central systems with HRVs: annual maintenance is strongly recommended.
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Post-renovation: cleaning should be done immediately.
The AirGreen advantage: expertise, precision, and local presence
We put our expertise at the service of your family’s or employees’ health. Our technicians are certified, equipped with top-tier tools, and trained to work efficiently, safely, and without major disruption. Thanks to our deep knowledge of central heat pumps, wall-mounted AC units, multi-zone systems, and commercial HVAC units, we tailor our methods to each setup.
Tips to maintain clean indoor air between cleanings
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Replace or clean filters every 2 to 3 months.
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Don’t block air vents with furniture.
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Control humidity with a dehumidifier if necessary.
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Schedule an annual inspection of your ventilation system.
Conclusion: HVAC maintenance is an invisible but vital investment
In a world where outdoor pollution and allergens are everywhere, your ventilation system is your first line of defense for indoor air quality. But when neglected, it becomes an invisible enemy, circulating harmful contaminants with every breath.
At AirGreen, we don’t just sell and install HVAC systems: we’re with you for the long haul, offering thorough, professional cleaning tailored to the needs of the greater Montreal region. Give your family or staff the gift of clean, purified air, all year round.
Contact us today to schedule an inspection or cleaning of your ventilation ducts.