Optimizing the lifespan and efficiency of a wall-mounted or central air conditioning system starts with regular maintenance. But it has to be done properly. At AirGreen, our team of experts in cleaning air conditioning, ventilation and heating systems (HVAC) works daily across Montreal, Laval, Longueuil, the North Shore and the South Shore to correct mistakes that are often easily avoidable. Here are the 5 most costly mistakes we see—and more importantly, how to avoid them.
Negligence that costs: the mistakes to avoid when cleaning HVAC systems
Air conditioning systems are not designed to be ignored. Poor or infrequent maintenance doesn’t just reduce energy efficiency—it also leads to premature wear and tear of internal components. Here’s an overview of the mistakes you absolutely need to avoid.
1. Only cleaning the filters… and ignoring everything else
Many homeowners think that rinsing the filters is enough. In reality, cleaning an air conditioning system goes way beyond that.
Why this is a mistake:
The fan, evaporator, ducts, and especially the turbine accumulate dust, mold, and debris. Skipping those parts leads to blockages, unpleasant odors, and energy overconsumption that can reach up to 30% more.
What we do at AirGreen:
When we’re on-site, we perform a complete system cleaning, including the most critical internal components. For example, during a job in Longueuil, a customer complained of a persistent bad smell. Upon inspection, we found a buildup of mold in the evaporator — invisible to the naked eye without disassembly. The issue was fixed on the spot.
2. Using the wrong or corrosive cleaning products
Many people, with the best intentions, use household cleaners or overly strong detergents to “deep clean.”
Why this is a mistake:
These products can damage aluminum fins, ruin gaskets, and affect electronic components. The result? Expensive repairs, sometimes even full replacement of the unit.
Our professional approach:
We use products specifically designed for HVAC systems, approved by manufacturers like Fujitsu, Gree, Sharp, and Bosch. For instance, on a Fujitsu KZAH R-32 system installed in Laval, a previous owner had used a harsh cleaner. The result: internal corrosion. We had to replace the heat exchanger. Since then, the system has been running perfectly—with proper maintenance.
3. Ignoring the outdoor unit (condenser)
This is the most common mistake in Montreal, especially in condos or homes with balconies: the outdoor unit gets neglected.
Why this is a mistake:
The condenser is exposed to dust, dead leaves, pollen, and urban pollutants. If it’s blocked, it can’t release heat properly. This leads to overheating, reduced performance, and in extreme cases, total breakdown.
Real-life example:
During a yearly maintenance call in Montreal – Rosemont neighborhood, we were called to service an 18,000 BTU Gree Extreme wall-mounted heat pump. The outdoor unit was completely blocked. Result: overheating compressor and excessive energy consumption. After a professional cleaning, the client reported a 25% drop in their Hydro-Québec bill.
4. Not following the recommended maintenance schedule
Some users wait 2 or even 3 years before servicing their air conditioning system. Big mistake.
Why this is a mistake:
Even if the system seems to be working, micro-deposits build up, performance gradually drops, and energy bills go up. Inconsistent maintenance can also void the manufacturer’s warranty.
AirGreen’s recommendation:
A yearly professional cleaning, ideally before summer starts, ensures optimal performance. We offer personalized maintenance contracts across Montreal, Laval, and surrounding areas, with automatic reminders so you never miss a service.
5. Trying to clean complex components yourself
Trying to disassemble your unit for “deeper cleaning” can quickly turn into a disaster.
Why this is a mistake:
Poor disassembly can lead to:
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Refrigerant gas leaks
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Damaged electrical connections
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Miscalibrated airflow systems
And above all, it voids the manufacturer’s warranty.
What we recommend:
Trust certified technicians. At AirGreen, we work with specialized tools and safe protocols, whether we’re servicing a Bosch BIVA R-454b system, a Sharp ZU1, or central units like Goodman R-32.
How to extend the life of your air conditioning system with professional maintenance
Direct benefits:
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Fewer unexpected breakdowns
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Better indoor air quality
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Significant energy savings
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Warranty remains valid
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Optimal comfort year-round
Areas covered by our HVAC maintenance teams:
Our technicians respond quickly throughout Greater Montreal, including Laval, Longueuil, the North Shore (Blainville, Terrebonne, Repentigny) and the South Shore (Brossard, Saint-Hubert, Sainte-Julie).
Customer testimonial – Sainte-Julie, South Shore
"After two tough summers with an inefficient air conditioner, AirGreen found that the internal fan was completely clogged. The technician disassembled, cleaned, and recalibrated everything. Since then, it’s been working like new. Professional service from start to finish."
— Mr. Lemoine, homeowner
Practical tips for optimal maintenance
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Never go more than 12 months without a professional cleaning
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Regularly check filter condition (and replace if needed)
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Make sure nothing is blocking the outdoor unit (vegetation, objects)
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Schedule your next cleaning in the spring, before the hot weather
Why trust AirGreen?
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Certified, experienced team
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Custom service for all HVAC brands
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Transparent and clear quotes
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Fast response times throughout Greater Montreal
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Satisfaction guaranteed