Loss of performance detected at the start of the summer season
At AirGreen , we work daily in the greater Montreal area, Laval , and on the South and North Shores to ensure optimal performance of residential HVAC systems. This time, our team was called to Beaconsfield , on the West Island of Montreal, to diagnose a Gree wall-mounted heat pump that was no longer effectively cooling the home of a loyal customer.
The owner had noticed that, despite the outdoor unit apparently working, the air blown inside was barely cool . With the rapidly rising temperatures, he preferred to act quickly by contacting our specialists.
Accurate diagnosis on a Gree Smart Series heat pump
Upon our arrival, our AirGreen-certified technician undertook a complete inspection of the installation. The Gree outdoor unit, securely mounted to a concrete slab, was generally clean—a sign of proper maintenance. However, one anomaly was visible: the compressor would start and stop quickly , a behavior typical of an imbalance in the refrigeration circuit .
We carried out a series of technical tests:
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Digital manifold pressure measurement : abnormally low pressures in cooling mode.
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Discharge pipe temperature control : excessive overheating.
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Electrical continuity test : all electronic components were functional.
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Visual inspection : no visible traces of oil, but suspicion of an internal micro-leak.
These clues confirmed a lack of R410A refrigerant , probably caused by a slow leak on a flare fitting or a seal that had become slightly loose over time.
Technical intervention: complete recharge and leak test
To ensure a lasting repair, our team carried out a complete and safe intervention :
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Recovery of the remaining refrigerant in the circuit using a certified recovery cylinder.
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Nitrogen injection under pressure to test the system for leaks. After 20 minutes at 300 psi, a very slight leak was detected on the condenser side suction connection .
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Reforming the flare and replacing the sealing washer .
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Extended leak test to confirm perfect circuit closure.
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High vacuum up to 500 microns to eliminate all traces of moisture.
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Recharge the system with R410A refrigerant according to the charge recommended by Gree, weighed precisely on an electronic scale.
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Final performance test : temperatures, pressures and electrical currents all compliant.
The result was immediate: the Gree heat pump began producing consistently cool air again, and the compressor was operating at full efficiency without short cycling or overheating.
Results: restored comfort and optimized efficiency
At the end of the intervention, the system displayed ideal performance values :
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Stable discharge temperature at 48°C.
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Indoor air differential of 11°C between inlet and outlet.
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Pressure balanced according to the outside temperature of the day (approximately 250 psi in high pressure).
The customer immediately noticed a clear improvement: the interior temperature of his house dropped in less than an hour, proof of a heat pump that is now efficient and well-calibrated.
We also checked and cleaned the condensate drain and condenser fins , ensuring smooth flow and better air circulation around the unit.
Best practices recommended to the client
Before leaving, our AirGreen technician offered some preventative maintenance tips to extend the life of the system:
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Clean the internal filters every month during the summer.
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Keep at least 60 cm of clearance around the outdoor condenser .
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Schedule a complete service in the spring or fall to check pressures and clean the exchanger.
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Never completely cover the outdoor unit in winter — use a ventilated cover instead.
These simple actions can prevent 80% of common service calls related to performance issues.
AirGreen expertise at your service
At AirGreen , every service call is handled with precision and transparency. We use only professionally calibrated tools (digital manifolds, electronic leak detectors, high-efficiency vacuum pumps) and adhere strictly to Gree manufacturer procedures .
Our interventions are not limited to repairs: they also aim to optimize energy efficiency and prevent future breakdowns . It is this proactive approach that has built our reputation throughout the greater Montreal region, Laval, the North Shore and the South Shore.
Conclusion: A Gree heat pump ready for summer
This client's Gree wall-mounted heat pump in Beaconsfield is now fully operational, ready to withstand the summer heat while maintaining excellent energy efficiency. Thanks to meticulous work and renowned expertise, AirGreen helped the client regain the comfort and peace of mind they expected from their HVAC system.
AirGreen – Experts in repair, maintenance and installation of HVAC systems from Gree, Mitsubishi, Fujitsu, LG and more, in Montreal, Laval, Longueuil, on the North Shore and the South Shore.