Energy efficiency, indoor air quality, and overall comfort in residential buildings are closely tied to the condition of their ventilation systems. At AirGreen, we see this firsthand every day during our service calls throughout Montréal, Laval, Longueuil, the North Shore, and the South Shore. This article tells the detailed story of a real-life experience: a complete cleaning of the ventilation systems in a condo building in Montréal, a project that completely transformed the living conditions for the residents.
A Concerning Initial Diagnosis
When the condo board of this five-story residential building in Rosemont–La Petite-Patrie reached out to us, they reported multiple issues: persistent odors, excessive dust, poor heating performance during winter, and stagnant air in several units. At first glance, there didn’t seem to be any mechanical failure. But a thorough inspection by our HVAC maintenance specialists revealed a critical issue: the ventilation ducts were clogged with years’ worth of dust, mold, and debris.
Detailed Inspection with HD Camera and Airflow Analysis
At AirGreen, every cleaning job starts with a high-definition visual inspection using a telescopic camera. This technology allowed us to confirm that over 70% of the return and supply ducts were partially or completely blocked. The airflow in some units was below 40% of recommended standards, which explained the temperature inconsistencies and poor air quality throughout the building.
A Three-Phase Approach for Lasting Results
Phase 1: Protection, Access, and Site Safety
Before beginning the work, our team installed full protective coverings in common areas, elevators, stairwells, and unit entrances. Access to the main ducts was made through technical ceilings located in the underground parking and in the hallways.
Phase 2: Mechanical Cleaning Using Negative Pressure
We used a combination of industrial negative pressure vacuums, motorized rotary brushes, and flexible telescopic brushes to dislodge debris from the inner walls of the ducts. The system was connected to HEPA filters to prevent any cross-contamination. This method complies with the standards of the National Air Duct Cleaners Association (NADCA), ensuring maximum efficiency without damaging the infrastructure.
Phase 3: Antimicrobial Treatment and Airflow Optimization
Following the mechanical cleaning, we applied a certified antimicrobial treatment inside all ducts to eliminate any remaining traces of mold or bacteria. We then readjusted the airflow balancing dampers, ensuring even air distribution across all units.
Results Within the First 24 Hours
Feedback from the condo owners was immediate and unanimous:
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Significant improvement in air quality
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Reduction in allergens and odors
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15–20% drop in energy consumption thanks to better performance from the central heating systems
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Thermal comfort restored in units on the upper floors
Several residents suffering from respiratory issues or sensitivity to mold reported noticeable improvements in their health just days after the service.
Why This Type of Service is Essential for Multi-Unit Buildings
Many residential buildings in Greater Montréal are equipped with centralized ventilation systems shared among multiple units. Over time, these ducts accumulate particles, allergens, organic debris, and even rodent droppings or hidden mold. Without proper maintenance, these pollutants circulate freely, impacting residents’ health, energy efficiency, and the longevity of the equipment.
Recommended Frequency and Practical Tips
At AirGreen, we recommend a complete cleaning of ventilation ducts every 3 to 5 years, depending on the building’s age, system usage, and the presence of pets or sensitive individuals.
Here are some signs that indicate a cleaning is needed:
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Presence of black or gray dust around vents
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Unusual odors in rooms
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Visible mold near air grilles
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An increase in allergies or asthma among residents
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Inconsistent temperatures from one room to another
AirGreen: Your HVAC Cleaning Expert in Montréal and Surrounding Areas
Our teams are trained to handle all types of buildings: condo complexes, high-rise buildings, businesses, schools, daycares, clinics, and more. We use cutting-edge equipment, adhere to the strictest standards, and tailor each job to the unique layout of the property.
We’ve successfully completed hundreds of duct cleanings in Montréal, Laval, Longueuil, the North Shore, and the South Shore. Each customer receives a detailed report with before/after photos, along with personalized recommendations for future upkeep.
Conclusion: A Smart and Essential Investment
A simple duct cleaning can transform an entire building. It improves quality of life, extends HVAC system lifespan, lowers energy bills, and protects residents’ health.
At AirGreen, we believe that clean air is a fundamental right. That’s why we’re committed to providing professional, transparent, and tailored HVAC cleaning services to meet every customer’s specific needs.
Let us handle your next ventilation maintenance project and see the difference for yourself.
