Warm airflow in the heat: a precise diagnosis by AirGreen
On a hot summer day in La Prairie , a customer contacted us after noticing that their Gree wall-mounted heat pump was no longer cooling as well as it used to. The unit was blowing lukewarm air despite a temperature set at 18°C, and the outdoor compressor seemed to be running. To avoid excessive energy consumption and prolonged discomfort, our AirGreen team visited the site to diagnose the problem.
Initial inspection: a functional but ineffective device
Upon arrival, we carried out a series of quick checks:
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The indoor unit was working, but the outgoing air was not cold enough.
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The temperature measured at the exchanger outlet indicated 12.1°C , which is too high for optimal air conditioning mode.
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The Gree outdoor compressor started, but the refrigerant circuit pressure was slightly below the nominal values.
These observations pointed to an imbalance in the refrigeration cycle .
Diagnosis: Dust accumulation and insufficient refrigerant level
Opening the hood of the wall-mounted unit revealed significant fouling of the evaporator , a direct consequence of missing annual maintenance. This layer of dust prevented proper heat exchange between the indoor air and the refrigerant.
Additionally, a slight loss of refrigerant was detected at the service valve, likely due to a seal weakened by age.
Intervention: complete cleaning and precision recharging
Our technicians have carried out a complete upgrade procedure :
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Complete cleaning of the evaporator, crankcase and filters with a biodegradable degreaser.
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Tangential fan dust removal , ensuring uniform airflow.
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Checking the refrigeration circuit with nitrogen to ensure it is leak-proof.
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Replacement of the defective seal at the service valve.
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Recharge with R410A refrigerant , calibrated to the nearest gram according to the Gree manufacturer's specifications.
Performance Check: Return to Full Capacity
After restarting the system, the difference was immediate:
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Blowing temperature: 7.8°C (compared to 12.1°C before intervention).
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Power consumption: stabilized at a nominal level.
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Operating noise: standardized.
Our infrared thermometer confirmed a constant cold air output , indicating that the system was returning to full efficiency.
Advice given to the client
We took advantage of this intervention to remind the customer of good maintenance practices for a wall-mounted heat pump :
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Clean filters every 6 to 8 weeks.
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Schedule an annual professional maintenance including coil cleaning and gas check.
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Monitor any variation in performance or noise , which may indicate a microleak or progressive fouling.
Why choose AirGreen in La Prairie and Greater Montreal?
At AirGreen , we specialize in the diagnosis and repair of wall-mounted heat pumps from Gree , Fujitsu, Midea, Sharp, Zephyr, Trane and several other brands.
Our interventions are distinguished by:
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Certified technicians familiar with the specific features of each brand.
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Original parts and refrigerants that meet environmental standards.
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Fast and transparent service , available in Montreal, Laval, Longueuil, on the North Shore and the South Shore.
Final result: restored comfort and regained efficiency
The customer immediately noticed a pleasant temperature and a constant airflow in his living room. His Gree wall-mounted heat pump finally regained its initial performance, ensuring optimal comfort while maintaining reduced energy consumption .
Simple maintenance negligence can sometimes reduce the efficiency of an HVAC system by 30%. This intervention in La Prairie proves that accurate diagnosis and careful maintenance can restore a heat pump's power, reliability, and longevity.