A behind-the-scenes look at successful maintenance: AirGreen expertise in action
At AirGreen, we know that the performance and longevity of a wall-mounted air conditioner depend directly on the quality of its maintenance. This isn’t a luxury—it’s a necessity, especially in a climate like Montréal, where summers can be heavy and units pushed to their limits. In this article, we take you inside a recent maintenance job carried out by one of our seasoned technicians, uncovering practical details, mistakes to avoid, and helpful tips to keep your wall-mounted air conditioner working perfectly year after year.
Why wall-mounted air conditioner maintenance is non-negotiable
Even the most high-performing wall-mounted air conditioner models—such as those from Gree, Fujitsu, or Sharp—can only deliver optimal energy efficiency if they are maintained regularly. A neglected unit will accumulate dust, mold, and moisture, all of which compromise indoor air quality and increase energy consumption.
Here are some direct consequences of poor maintenance:
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Drop in energy efficiency.
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Increased risk of breakdowns or premature wear.
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Degraded indoor air quality.
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Loss of eligibility for energy efficiency grants (e.g., Hydro-Québec’s LogisVert program).
Case study: full maintenance of an 18,000 BTU wall-mounted air conditioner in Laval
We were recently called in to perform complete maintenance on a Gree Extreme 18,000 BTU wall-mounted air conditioner installed in a Laval bungalow. The unit had been installed two years earlier by another contractor, but the homeowner had started noticing a performance drop, strange noises, and a persistent odor when the system was running.
Initial diagnostics: thorough inspection
As soon as we arrived, our technician performed a comprehensive diagnostic:
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Checked filters and coils.
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Inspected the blower wheel.
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Tested airflow and refrigerant levels.
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Looked for signs of mold or moisture buildup.
The results: excessive dust buildup on the blower, clogged filters, and biological residues in the condensate drain pan. Ideal conditions for bacteria and mold to grow.
Step-by-step breakdown of the maintenance process
At AirGreen, every maintenance job follows a strict, thorough protocol that goes far beyond a simple filter cleaning. Here are the key steps we followed on-site:
1. Protecting the work area
We laid out protective covers around the wall unit to shield the client’s walls and furniture.
2. Safe disassembly of the unit
The front panel, filters, and blower wheel were carefully removed to allow for deep cleaning.
3. Thorough cleaning with specialized products
Using our controlled pressure jet system and a biodegradable disinfectant approved by Health Canada, we:
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Scrubbed the evaporator coils.
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Eliminated mold from the blower wheel.
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Cleaned and disinfected the condensate drain pan.
4. Electrical connections and performance testing
We tightened all connections, checked capacitors, and ran a cold start-up test to confirm optimal operation.
5. Personalized advice for the client
Our technician explained how to clean the filters monthly, when to schedule professional maintenance, and what signs to watch for to avoid future issues.
Tangible results for the client
After our service:
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Airflow was restored to 100% of its original capacity.
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The unpleasant smell was completely gone.
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Electricity usage dropped by 18%, based on the client’s smart thermostat tracking.
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The client received a maintenance certificate, useful to retain eligibility for LogisVert grants if the unit is ever replaced.
Common mistakes we see far too often
At AirGreen, we regularly see mistakes made either by homeowners or uncertified technicians:
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Using bleach or abrasive chemicals on internal components.
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Only cleaning the filters, ignoring the coils and blower wheel.
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Overlooking signs of stagnant moisture, which encourage mold growth.
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Forcing open the front panel, leading to damage.
Wall-mounted air conditioner maintenance is a technical task that must be performed by a trained professional equipped with the proper tools and procedures.
Why choose AirGreen for your wall-mounted air conditioner maintenance
Our strength lies in our hands-on experience, transparency, and meticulous approach. We don’t just maintain equipment—we preserve its performance and protect your indoor air quality.
With hundreds of satisfied clients in Montréal, Laval, Longueuil, on the North Shore and South Shore, we’ve developed specialized expertise across brands (Fujitsu, Gree, Haxxair, Daikin…), installation types (condo buildings, single-family homes, commercial properties), and environments (humid basements, row houses, urban lofts…).
Preventive maintenance tips you can apply
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Clean your filters every 4 to 6 weeks.
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Never block the air outlet of the wall-mounted unit.
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Schedule annual professional HVAC maintenance before summer.
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Watch for signs: strange noises, reduced performance, persistent odors.
A tailored service adapted to your reality
We always tailor our maintenance based on:
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The air conditioner model and capacity (e.g., 9,000, 12,000, or 18,000 BTU).
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The environment (urban, suburban, dusty, humid).
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The age of the unit and its usage cycle.
This ensures our clients benefit from optimal, long-lasting, and cost-effective HVAC service.
Conclusion: quality lies in the details
Wall-mounted air conditioner maintenance is not just a formality—it’s a technical process that extends the unit’s lifespan, improves air quality, and optimizes your comfort while lowering your energy bills. At AirGreen, we take this commitment seriously across Montréal and its surrounding areas.
Contact AirGreen today
To book your HVAC maintenance, give us a call or fill out our online form. Our certified technicians travel throughout Montréal, Laval, Longueuil, the North Shore and South Shore to deliver reliable, detailed, and professional service.