There are still many misconceptions about HVAC system cleaning circulating across Montréal, Laval, Longueuil, and the North and South Shores. These myths persist despite advancements in technology, modern environmental standards, and growing awareness of indoor air quality. At AirGreen, we see the direct consequences of these false beliefs every day: poorly maintained systems, reduced performance, excessive energy use, and often, avoidable health issues.
That’s why we’ve decided to address these myths clearly, technically, and honestly, based on our real-world experience in cleaning heat pumps, wall-mounted air conditioners, ventilation systems, ducts, and air exchangers. Here are 7 common myths we hear regularly – and why they’re simply not true.
Myth #1: “My HVAC system is new, I don’t need cleaning for several years.”
This is a very common mistake. A new unit does not mean a clean one after just a year of use, especially in an urban setting like Montréal. Dust, pollen, pet hair, and even construction particles can build up quickly.
At AirGreen, we’ve cleaned FUJITSU and GREE heat pumps that had been installed for less than two years, and the inside of the units were already lined with grime affecting thermal exchange. Energy efficiency drops, and so does the equipment’s lifespan. Cleaning it early, as soon as the first year, maximizes performance and protects your investment.
Myth #2: “Cleaning the ducts is enough, there’s no need to clean the units.”
That’s like washing a car without touching the windows or wheels. Wall-mounted units, central heat pumps, fans, and coils also need cleaning to eliminate mold, biofilms, and dust particles that are invisible to the naked eye.
During a recent service in Laval, our team found an air exchanger that looked clean on the outside, but its fan was caked in sticky buildup, reducing airflow by 30%. The customer had actually had their “ducts cleaned” the previous year. Our full cleaning restored the entire system’s performance.
Myth #3: “There’s no smell, so my system must be clean.”
False. No smell does not mean no contaminants. Microorganisms, spores, and fine particles are odorless but can still affect respiratory health, especially in children, seniors, and sensitive individuals.
We recently cleaned an 18,000 BTU Gree Lomo wall-mounted heat pump in Longueuil. It had no noticeable smell, but a thorough inspection using UV cameras and microbial detection revealed active mold inside the coil.
Myth #4: “I can clean it myself with a vacuum and a damp cloth.”
This might be the most dangerous myth. A bad cleaning job can:
-
Damage internal components
-
Leave behind moisture that encourages microbial growth
-
Only clean the surface, leaving critical areas untouched
At AirGreen, we use professional high-pressure cleaning tools, certified hypoallergenic products, special duct nozzles, and inspection cameras. That level of thoroughness simply can’t be matched with a household vacuum.
Myth #5: “Cleaning once every 5 years is enough.”
This statement goes against every manufacturer’s recommendation. Whether you use a FUJITSU RLS3 wall-mounted A/C or a BOSCH IDS Premium central heat pump, annual maintenance is essential to keep the warranty valid, preserve energy efficiency, and prevent gradual buildup.
We recommend a full professional cleaning once a year, and partial cleanings every 6 months in homes with pets, smokers, or people with asthma.
Myth #6: “Cleaning doesn’t really affect my electricity bill.”
It’s actually the opposite. A dirty system can use up to 25% more energy to deliver the same comfort. In Montréal, where winters are long, that added consumption can mean hundreds of dollars a year.
A client in Boisbriand, on the North Shore, saw their Hydro-Québec bill drop by 18% after we cleaned their 24,000 BTU Goodman R-32 central HVAC system, including ducts, exchanger, and heat pump.
Myth #7: “Cleaning is useless if the system still works.”
A car engine will still run with dirty oil, but its performance and lifespan suffer. The same goes for your HVAC system. A quiet system isn’t necessarily an efficient one.
We were recently called out to Repentigny, where a 3-year-old ARCOAIRE central heat pump was still running but was experiencing heat loss, random noises, and poor airflow. A thorough cleaning solved all those issues – without needing to replace anything.
Why choose AirGreen for your HVAC cleaning?
-
Certified technicians, experienced with all system types (wall-mounted, central, multi-zone, ducted)
-
Proven cleaning methods, aligned with manufacturer recommendations and Quebec standards
-
Full-service cleanings, including ducts, air exchangers, heat pumps, A/Cs, and outdoor units
-
Service areas: Montréal, Laval, Longueuil, North Shore, South Shore
-
Tailored approach based on your needs: residential, commercial, multi-unit
AirGreen expert tips for optimal maintenance:
-
Clean your filters every 3 months
-
Schedule a complete professional cleaning at least once a year
-
Keep the outdoor unit clear of vegetation or snow
-
Request a thermal camera inspection if you suspect a performance issue
Clear takeaway: cleaning isn’t a luxury, it’s a necessity
By refusing to believe these 7 myths, you extend your system’s lifespan, save on your energy bills, and most importantly, breathe healthier air at home. At AirGreen, we’re committed to delivering meticulous, transparent, and complete service backed by years of HVAC expertise across Montréal and surrounding areas.