A loss of performance caused by internal fouling
At AirGreen , we know that regular maintenance of HVAC systems is essential to maintain their optimal performance. It was in this context that we were called to Saint-Lambert , on the South Shore, to diagnose a Gree wall-mounted heat pump that was no longer heating efficiently. The client had noticed a warm airflow, abnormal noise, and increased energy consumption.
First inspection: saturated filters and evaporator
By opening the front panel of the indoor unit, our technicians immediately identified the root cause of the problem:
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Air filters heavily clogged with household dust and fibers.
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Dirty evaporator fins , reducing heat transfer.
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Partially obstructed temperature probe , resulting in poor setpoint control.
These combined factors explained the drop in system performance and the excess power consumption observed by the customer.
In-depth technical diagnosis
To confirm the diagnosis, our team measured:
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The outlet air flow rate is 40% lower than the manufacturer's standard.
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The evaporation temperature of the refrigerant , abnormally low, indicating a restriction of heat exchange.
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Refrigeration circuit pressures were stable - a sign that the compressor was working properly.
Since the outdoor unit was in good condition, we were able to conclude that there was no refrigerant leak. The problem was solely due to internal fouling of the wall module .
Intervention: deep cleaning and calibration of sensors
The intervention consisted of:
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Disassemble the filters and clean them in warm water with a mild detergent.
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Clean the evaporator with a certified antibacterial foaming product for HVAC systems.
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Check the temperature probe , clean its sheath and recalibrate the sensor for accurate signal feedback.
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Clean the blower turbine , often forgotten, but crucial for air flow.
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Disinfect the condensate tray and drain pipe to prevent unpleasant odors and bacterial growth.
After these steps, the heat pump was restarted. We performed a full test in heating mode , and the blowing temperature reached 42°C, which corresponds to the factory rated performance for this Gree model.
Immediate results and maintenance tips
The customer immediately noticed:
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Improved airflow and thermal comfort in the room.
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A reduction in noise emitted by the fan.
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A stable and uniform temperature throughout the ground floor.
We recommended:
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Cleaning the filters every four to six weeks .
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A complete professional maintenance twice a year , before the heating and cooling seasons.
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Monitoring the condensate drain , particularly during humid periods.
Why this maintenance is essential
A poorly maintained HVAC system can:
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Lose up to 30% of its energy efficiency .
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Accumulate bacteria and mold in the ducts.
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Cause premature wear of the compressor and motor .
At AirGreen, we emphasize the importance of prevention: simple, regular, and professional maintenance avoids costly repairs and extends the life of the system.
AirGreen expertise in Saint-Lambert and on the South Shore
Our team operates in Saint-Lambert, Brossard, Boucherville, La Prairie, and Sainte-Julie , for all types of residential and commercial HVAC systems. We are trained to maintain and repair the most popular brands— Gree, Fujitsu, Mitsubishi, Midea, Tosot, Sharp, Zephyr , and more.
Every service call is an opportunity for us to ensure optimal performance, impeccable air quality and lasting comfort for our customers.
Technical summary:
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Device type: Wall-mounted heat pump
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Brand: Gree
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Location: Saint-Lambert (South Shore)
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Problem: Low heating, clogged filters and evaporator
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Solution: Complete cleaning, recalibration of the probe, disinfection of the drain
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Result: Restored performance, regained comfort, quiet operation
At AirGreen , we put our expertise to work for comfort and energy efficiency, winter and summer.