A typical service call, exceptional expertise from AirGreen
At AirGreen , every HVAC service call is an opportunity to demonstrate our expertise and commitment to the comfort of Greater Montreal residents. This time, our team responded to a Zephyr wall-mounted air conditioner in La Prairie , on the South Shore , that was performing abnormally despite the temperature setting being set correctly.
The customer contacted us after noticing that, even though the unit was set to 16°C, the air supply remained lukewarm. This is a common problem that our technicians diagnose and repair daily.
Accurate diagnosis thanks to our experience and our measuring instruments
Upon arrival on site, our technician carried out a complete inspection of the Zephyr wall unit .
Using a professional infrared thermometer , the supply air temperature was measured at 11.1°C , indicating that the system was working — but not enough to achieve the expected comfort.
Possible causes in this type of situation include:
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Lack of refrigerant (R-32 gas) due to a micro-leak in the circuit.
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Clogged filters , reducing airflow and refrigerant pressure.
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Dirty evaporator coil , preventing good heat exchange.
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Internal temperature sensor malfunction .
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Electronic card problem affecting compressor control.
A rigorous step-by-step verification
Step 1 – Visual Inspection and Initial Testing
The indoor unit cover was removed to check the filters , the tangential fan and the motorized shutters .
Result: a slight deposit of dust on the filters, but nothing alarming.
Step 2 – Refrigerant Pressures and Temperatures
Outside, the Zephyr compressor was put under observation. Our instruments confirmed that the suction pressure was lower than normal, indicating a possible lack of R-32 gas .
Step 3 – Leak Search
Using an electronic detector , a micro-leak was detected at the brazing of the flare fitting connecting the compressor to the suction line.
This type of leak is common when fittings are not tightened enough or when they have suffered slight vibrations over time.
Repair: precision and reliability
Our technicians have:
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Drained the circuit and recovered the existing refrigerant.
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Cleaned and re-welded the affected connection to ensure a perfect seal.
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Conducted a leak test under nitrogen at 300 psi for 30 minutes.
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Recharged the system with R-32 according to Zephyr manufacturer's specifications.
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Performed a final performance test : the blowing temperature went from 11.1°C to 7.4°C at the unit outlet.
Result: restored comfort and optimized performance
After the intervention, the Zephyr wall-mounted air conditioner resumed optimal operation.
The customer immediately felt the difference: fast, even and quiet cooling.
We also took the time to remind him of some good maintenance practices :
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Clean the filters every month during the summer season.
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Maintain sufficient clearance around the outdoor condenser .
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Schedule an annual AirGreen preventive inspection to prevent performance losses and extend the life of the system.
The importance of professional AirGreen maintenance
A wall-mounted air conditioner, even from a reliable brand like Zephyr , remains a technical device requiring regular monitoring .
At AirGreen, our certified technicians operate in Montreal, Laval, Longueuil, the North Shore and the South Shore with the same high standards of diagnosis, transparency and precision.
Each HVAC repair is documented and validated by our internal supervisors to guarantee:
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Genuine parts that meet manufacturer specifications.
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Maximum energy efficiency after intervention.
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Clear and honest communication with the customer before, during and after the repair.
In summary
This repair of a Zephyr wall-mounted air conditioner in La Prairie perfectly illustrates the AirGreen philosophy:
expertise, rigor and customer satisfaction above all.
Our mission is to ensure that every residence in Greater Montreal benefits from reliable thermal comfort , summer and winter.