AirGreen intervention in Laval: performance restored on a Lennox central heat pump
At AirGreen , we work daily on HVAC systems of all sizes, whether wall-mounted, multi-zone, or central. Recently, our team was called for a Lennox central heat pump repair in a single-family home in the Chomedey neighborhood of Laval . The customer noticed that the system was running non-stop, but the indoor temperature never rose above 18°C, despite the thermostat being set at 22°C.
This type of symptom—continuous operation without performance—is typical of a problem with the refrigeration circuit or airflow in a central system.
First step: complete inspection and precise diagnosis
Our certified technician arrived on site to conduct a complete system analysis . The Lennox outdoor unit, securely mounted on a galvanized steel wall bracket, had a clean installation, but some signs of wear were visible:
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Condenser slightly clogged with dust and leaf debris.
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Partially exposed refrigerant lines with deteriorated insulation.
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Electrical connections showing slight oxidation at the wall circuit breaker.
Using our digital diagnostic tools, we carried out:
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Pressure measurement in heating mode : lower than normal, indicating a partial pressure drop.
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Delta T analysis (temperature difference between suction and discharge) : only 5°C, instead of the expected 12–15°C.
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Inspection of the indoor coil using an inspection camera: accumulation of dust and oily deposits.
Conclusion: A minor refrigerant leak combined with indoor coil fouling significantly reduced the overall efficiency of the system.
System Repair and Refurbishment Steps
Once the diagnosis was confirmed, our team proceeded with the following steps:
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Complete recovery of residual refrigerant to avoid any emissions into the environment.
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Nitrogen pressure test to locate the leak, identified on the compressor service connection .
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Replaced the faulty fitting and installed a new sealed Schrader valve .
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Complete cleaning of the outdoor condenser with a biodegradable Lennox SafeClean product.
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Interior maintenance : cleaning the evaporator coil, changing the air filter, and inspecting the furnace fan.
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Recharge R410A refrigerant to exact nameplate specifications (4.25 lbs).
We then tested the system under load for 30 minutes to confirm the stability of the pressures and the thermodynamic cycle.
Results after repair: efficiency and comfort restored
As soon as it was restarted, performance improved significantly:
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Suction pressure stabilized at 125 psi and discharge at 410 psi.
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Blowing temperature at 32°C measured at the return grille.
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Standardized power consumption, a sign of a compressor now at optimal efficiency.
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No leaks detected after final leak test.
The customer immediately noticed that the heater quickly reached the desired temperature , and that the compressor noise had been reduced thanks to the realignment of the unit on its wall mount.
Maintenance tips to extend the life of the system
To prevent the problem from happening again, we recommended:
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Complete preventative maintenance every spring , including pressure checks, condenser cleaning and electrical inspection.
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Replace the internal filter every three months .
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Monitoring the insulation of refrigeration lines to avoid yield losses.
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Professional cleaning of the indoor coil every two years.
At AirGreen , we emphasize proactive maintenance: a well-maintained system consumes up to 20% less energy and lasts several years longer.
AirGreen: your reference for central heat pumps in Laval and Greater Montreal
This Lennox central heat pump repair in Chomedey demonstrates our expertise in accurately diagnosing and upgrading complex HVAC systems. Our technicians, trained on the latest generations of Lennox, Midea, Goodman, Trane, and Bosch equipment, respond quickly and efficiently, whether in Laval , Montreal , Longueuil , or elsewhere on the North Shore and South Shore .
Thanks to our know-how and our cutting-edge diagnostic equipment, we guarantee long-lasting, safe interventions that comply with manufacturer standards .
Conclusion: a service signed AirGreen
By repairing the leak and performing a full system recharge, we restored the Lennox central heat pump to full thermal and energy performance . The customer now enjoys consistent comfort and reduced electricity consumption.
At AirGreen , every service call is handled with the same rigor—whether it's a wall-mounted, central, or multi-zone heat pump—so our customers in Montreal, Laval, Longueuil, the North Shore, and the South Shore can enjoy reliable comfort year-round.