A service call for a performance issue
A customer from Outremont , in the heart of Montreal, contacted us after noticing that his Gree wall-mounted heat pump was no longer cooling his living room effectively despite a temperature set at 21°C. The airflow seemed constant, but the outgoing air was lukewarm, and the unit's power consumption had increased significantly.
During our visit, our technician noticed a modern, well-maintained wall-mounted indoor unit from the Gree Lomo range , accompanied by a compact outdoor condenser placed on a rear balcony. The customer had already cleaned the air filters, without any tangible results.
Diagnosis: Partial loss of refrigerant
As always at AirGreen , our approach is based on a series of precise checks:
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Measurement of the blowing temperature using an infrared thermometer (21.0°C measured at the unit outlet).
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Checking the suction and discharge temperature on the outdoor compressor.
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Checking the refrigerant circuit pressures (R-32).
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Visual inspection of flare fittings and indoor coil.
The observed pressures confirmed a partial loss of refrigerant charge . A nitrogen test then located a micro-leak on the suction connection of the outdoor condenser – a common failure on some Gree models after several thermal cycles.
Repair: sealing, recharging and calibration
Our certified technician proceeded methodically:
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Recovery of residual gas using a CE-compliant recuperator.
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Replaced the flare fitting and tightened to the torque prescribed by Gree .
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Leak test under nitrogen at 300 psi for 30 minutes: no pressure drop detected.
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Completely vacuum the circuit to -30 inHg for 45 minutes to remove all moisture.
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Exact recharge with R-32 refrigerant according to the manufacturer's specifications (weight measured in grams).
Once switched on, the blowing temperature dropped to 8.1°C , demonstrating that optimal performance had been restored.
Results and final checks
We completed the intervention with:
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A check of the air flow at the outlet of the indoor unit.
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Antibacterial cleaning of coils to prevent biofilm formation.
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A thermal analysis of the part to confirm the effectiveness of the cooling.
The customer immediately noticed the difference: comfort was restored, the room temperature stabilized in less than ten minutes, and the operating noise remained almost imperceptible — a signature of Gree Inverter technology .
Prevention and maintenance advice
Minor leaks are often related to mechanical vibrations and repeated thermal expansion cycles. To prevent this type of problem, we recommend:
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A complete annual maintenance by an AirGreen technician.
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A visual inspection of the exterior fittings in the spring.
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Cleaning the coils using a biodegradable product.
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A check of the operating pressures before the hot season.
These measures help extend the lifespan of a wall-mounted heat pump and maintain its energy performance.
AirGreen expertise in Outremont and beyond
At AirGreen , we offer our HVAC expertise to residents of Montreal, Laval, Longueuil, the North Shore, and the South Shore . Our team is trained to work on all major manufacturers— Gree, Fujitsu, Midea, Sharp, Mitsubishi, Zephyr, Goodman, and Bosch —and quickly diagnose any problem, whether it's a leak, a faulty compressor, or a damaged control board.
Each repair is followed by a detailed technical report including measured pressures, temperatures, type of refrigerant used and personalized recommendations for future maintenance.
Conclusion: efficiency restored and customer satisfied
Thanks to a quick and precise intervention , the Gree heat pump in Outremont is now working like new. The blowing temperature of 8°C confirms the reliability of the repair, and the customer once again enjoys optimal comfort, even on the hottest days.
Once again, AirGreen demonstrates why we are the benchmark for HVAC repair in Montreal : expertise, rigor and transparency in the service of our customers' comfort.