A performance check for optimal cooling
At AirGreen , we were contacted in Côte-des-Neiges , in the heart of Montreal, for a service call regarding a Zephyr wall-mounted air conditioner . The customer reported that his unit seemed to be working—the fan was blowing—but the air being expelled wasn't as cold as usual, even on full power.
Initial diagnosis: a significant drop in performance
Upon our arrival, our technician used a professional infrared thermometer to measure the air conditioner's outlet temperature. The result: 25.9°C, while the ambient temperature was 24°C —an insufficient difference for good performance.
A wall-mounted air conditioner in good condition should produce a difference of approximately 8 to 12°C between the incoming air and the supply air.
We then began an in-depth analysis of the refrigeration circuit and the interior module .
Step 1: Complete inspection and cleaning of the indoor unit
When dismantling the cover of the Zephyr wall-mounted air conditioner , we noticed:
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significant fouling of the evaporator coil ,
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filters clogged with dust ,
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a dirty blower motor slowing down airflow,
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and a slight accumulation of stagnant water in the condensate tray.
These elements, although minor individually, greatly reduce the overall efficiency of a wall-mounted air conditioner. We carried out a complete cleaning including:
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a steam wash of the coil,
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disinfection of the condensate tray and drain,
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dust removal from the ventilation turbine,
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and replacing the air filter.
Step 2: Check the refrigeration circuit and gas pressure
We then connected our pressure gauges to check the R410A refrigerant pressure . The observed values confirmed an undercharge in the system—about 20% less than the recommended pressure rating for this 12,000 BTU Zephyr model.
No visible leaks were detected on the flare connections or on the external coil, which suggested a slow microleak in the circuit.
To correct the situation:
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we injected a fluorescent tracer ,
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performed a complete vacuum draw ,
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then recharged the circuit to the amount prescribed by Zephyr.
Step 3: Compressor Calibration and Performance Test
After recharging, we turned the unit back on and resumed the temperature measurements at the air outlet. The thermometer now read 14.7°C , a difference of more than 10°C from the ambient temperature—perfect performance.
We also have:
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checked the power consumption to ensure there were no power surges,
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recalibrated the internal temperature sensor,
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and checked that the dehumidification mode was working properly.
Step 4: Maintenance and prevention tips
Before concluding the intervention, our technician took the time to explain some good maintenance practices to the customer:
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clean the filters every 4 to 6 weeks during the summer,
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maintain a clear space around the indoor unit ,
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schedule an annual professional maintenance , including gas and sensor checks.
Result: restored comfort and optimal performance
Thanks to this quick and meticulous intervention , the Zephyr wall-mounted air conditioner in Côte-des-Neiges regained all its power. The customer could immediately see the difference: fresh, uniform, and quiet air.
This operation clearly illustrates our approach at AirGreen :
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precise diagnosis ,
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full interview ,
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and optimal technical adjustment , all in compliance with energy performance standards.
Why choose AirGreen for your HVAC repairs in Montreal
Our technicians operate in Montreal, Laval, Longueuil, on the North Shore and the South Shore , for all types of repairs to Zephyr wall-mounted air conditioners or other popular brands.
Thanks to our expertise and professional diagnostic tools, we ensure long-lasting repairs and measurable performance, as demonstrated by this successful intervention in Côte-des-Neiges.