A precise diagnosis for restored performance in a Laval residence
At AirGreen , we were recently contacted for an HVAC service call in Sainte-Dorothée , a residential neighborhood in Laval known for its modern homes. The customer contacted us after noticing that their Lennox wall-mounted heat pump was no longer cooling efficiently, despite a normal display on the remote.
Symptoms observed
The client explained that:
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The unit was blowing warm air instead of cold air;
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The outdoor compressor seemed to be running intermittently;
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And a significant temperature difference persisted between the rooms.
These symptoms could indicate a lack of refrigerant , a clogged coil , or a malfunction of the electronic card .
Initial inspection and diagnostic tools
Upon our arrival, we carried out a series of standard tests:
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Checking the electrical current and communication signal between the indoor and outdoor units;
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Control of air flow and blowing temperature using a professional infrared thermometer .
The photo above illustrates this key moment in the diagnosis: measuring the air temperature at the unit outlet . The device indicated a stable value of around 10.5°C , confirming that the system was producing cold—but with a notable loss of performance compared to the nominal specifications.
In-depth diagnosis: the cause identified
After complete analysis:
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The indoor coil showed signs of fouling , limiting heat exchange;
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The refrigeration circuit pressure measured outside revealed a slight deficit in the R410A refrigerant charge ;
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No active leaks were detected during the nitrogen test—a good sign that allowed for correction without major component replacement .
Technical intervention
Our certified team carried out the following operations:
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Complete cleaning of the interior coil using a biodegradable, no-rinse product that is safe for homes.
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Degreasing and cleaning of the tangential fan to remove dust and pollen deposits.
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Calibrated recharge with R410A refrigerant , with verification of static and dynamic pressure according to external conditions.
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Reset the electronic module and check the automatic defrost cycles.
Measured result: performance restored
Once the intervention was completed, the air outlet temperature dropped to 5.6°C , demonstrating excellent cooling efficiency . This drop of almost 5°C compared to the initial value confirms the return to performance in accordance with Lennox standards .
The customer immediately noticed better distribution of cold in his living room and bedroom, with a significant reduction in the time needed to reach the comfort temperature.
Recommended good maintenance practices
To prevent this type of problem from recurring, we advised the customer to:
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Clean air filters every 3 to 4 weeks during the summer season;
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Maintain a clear space around the outdoor unit to promote ventilation;
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Schedule annual preventative maintenance by an AirGreen certified technician.
These simple actions not only ensure the longevity of the system, but also a significant reduction in energy consumption .
AirGreen expertise: precision and transparency
Each intervention we carry out is based on three essential pillars:
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Rigorous diagnosis with certified instruments;
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Transparency of results (photos, measurements, clear explanations);
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Sustainable solutions tailored to each client.
We believe that trust is built through proof of performance —and every measurement, every test performed in front of the customer strengthens that relationship.
A trusted HVAC service in Laval and throughout Quebec
This project in Sainte-Dorothée perfectly illustrates the AirGreen philosophy:
offer an HVAC service combining technical expertise, customer service and compliance with the highest quality standards.
Whether it's heat pump repair , wall installation , or preventative maintenance , our team serves Montreal, Laval, Longueuil, the North Shore and the South Shore with the same rigor.
AirGreen : Your HVAC partner for lasting comfort, maximum energy efficiency, and peace of mind in all seasons.