Declining performance detected just in time
At AirGreen , we respond to service calls every day where diagnostic accuracy makes all the difference. That day in Sainte-Julie , a customer contacted us about his Gree wall-mounted heat pump , which he said "wasn't cooling as well as it used to." With summer just around the corner, he wanted to make sure his system was fully operational before the heatwave.
Arrival on site and first observations
Upon arrival, we found a recent and well-maintained installation. The indoor unit displayed an ambient temperature of 26.4°C , while our infrared thermometer indicated a blower temperature of 14.8°C . A difference of around 11°C may seem correct, but for a Gree unit of this range, we expected a difference of at least 14 to 16°C under normal load conditions.
The customer had already cleaned the filters, eliminating a common cause of performance loss, so it was time to take it further.
Technical diagnosis: eliminate possible causes
We undertook a full inspection:
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Airflow check : turbine clean, smooth rotation, no abnormal noise.
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Evaporator coil inspection : slight dust deposit on the surface, but not enough to block heat exchange.
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R-410A refrigerant pressure measured outdoors: slightly lower than standard.
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Leak search : no visible trace, but electronic test revealed a micro-leak around the flare connection on the evaporator side.
This small leak, invisible to the naked eye, was enough to reduce the performance of the heat pump.
Intervention: tightening and calibrated recharging
We tightened the fittings and completely vacuumed the system before recharging the exact amount of R-410A according to the Gree manufacturer's specifications.
Then, a performance test in real conditions confirmed the results:
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Inlet temperature: 26.5°C
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Outlet temperature: 10.2°C
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Thermal differential: 16.3°C , perfectly within standards.
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Sound level: stable and quiet, without vibration.
Customer explanations and maintenance advice
We took the time to explain to the customer the causes of this loss of performance:
a progressive microleak leading to a decrease in pressure, which reduces the compressor's ability to remove heat.
We also advised him:
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Have refrigerant pressures checked every 2 to 3 years.
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Clean the filters every 2 months during periods of intensive use.
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Plan annual preventive maintenance , especially before the summer season.
Thanks to this proactive approach, the customer regained optimal efficiency without replacing major parts—an excellent example of well-targeted corrective maintenance.
Result: comfort and efficiency restored
At the end of the installation, the Gree heat pump was blowing air at 10°C , ensuring an ideal indoor temperature. The customer immediately noticed the difference: faster cooling, quieter operation, and a constant feeling of freshness throughout the room.
This intervention demonstrates how rigorous symptom analysis and accurate diagnosis can prevent unnecessary repairs. At AirGreen , we always favor a data-driven approach and transparency, guaranteeing our customers performance, durability and peace of mind .
In conclusion
This Gree wall-mounted heat pump in Sainte-Julie perfectly illustrates the importance of preventive maintenance and rapid response at the first signs of performance loss.
Every appliance, regardless of brand— Midea, Fujitsu, Lennox, Mitsubishi, Zephyr, or Gree —receives expert attention when it passes through the hands of our certified and passionate AirGreen technicians .
For any HVAC repair or maintenance in Montreal, Laval, the North Shore or the South Shore , AirGreen remains your reference for fast, precise and durable service .