A sudden breakdown in the heat: our rapid intervention in Sainte-Thérèse
At AirGreen , we know how essential a wall-mounted air conditioner is to maintaining optimal comfort during the hottest days of summer. It was in this context that a customer living in Sainte-Thérèse , on the North Shore of Montreal , contacted us urgently for an operating problem with his Midea wall-mounted air conditioner . The unit was no longer blowing cold air and was emitting an unusual noise as soon as it was turned on.
Technical diagnosis: locate the origin of the problem
Upon our arrival, our technician performed a complete inspection of the indoor unit . The unit was visually clean, but upon removing the cover, we noticed that the evaporator was partially frosted , a classic sign of a refrigeration problem . An electrical test revealed stable voltage, which ruled out a power supply issue.
Analysis of the refrigeration circuit quickly confirmed a minor leak of R-32 refrigerant at the evaporator connection . This type of leak, often imperceptible to the naked eye, causes a gradual loss of performance until the unit is unable to produce cold air.
Repair steps: precision and rigor
Our team has undertaken the following steps:
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Safe recovery of remaining refrigerant , in order to comply with environmental standards.
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Cleaning and soldering the defective connection using an alloy suitable for the pressure of R-32.
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Leak check with pressurized nitrogen to ensure no leaks remained.
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Complete vacuuming of the circuit to eliminate all traces of humidity.
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Refrigerant recharge according to Midea specifications , calibrated to the nearest gram.
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Restart and performance test the unit to verify return to normal operation.
Result: efficiency restored and customer satisfied
A few minutes after restarting, the wall-mounted unit was again blowing cool, steady air. The measured blowing temperature was 9°C , perfectly in line with the manufacturer's performance standards. The noise level was also checked: after the repair, the outdoor compressor was running smoothly, without abnormal vibrations.
The client particularly appreciated our speed of response —less than 24 hours after his call—and the transparency of our explanations throughout the process.
Technical details and future prevention
The affected wall-mounted air conditioner was part of the Midea White 12,000 BTU series , a popular model for condos and single-family homes in the area. These units are known for their energy efficiency and quiet operation , but like any HVAC unit, they require regular maintenance to avoid breakdowns.
Our recommendations to the client:
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Have the filters and turbine cleaned at least twice a year.
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Schedule a refrigerant circuit inspection every three years.
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Avoid obstructing airflow around the outdoor unit.
Thanks to these measures, the life of the system can be extended by several years while maintaining optimal performance.
AirGreen expertise at your service throughout the North Shore
This intervention in Sainte-Thérèse perfectly illustrates our approach: precise diagnosis, lasting repair, and guaranteed customer satisfaction . At AirGreen, we operate throughout Montreal, Laval, Longueuil, on the North Shore and the South Shore , for the repair, maintenance and installation of HVAC units of all brands — including Midea, Gree, Fujitsu, Sharp, Lennox and Goodman .
Whether it's a refrigerant, electronic card or compressor problem, our team is equipped to identify the exact cause and restore your comfort quickly .
Why Choose AirGreen for Your HVAC Repairs
Using AirGreen means benefiting from:
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Certified expertise in wall, central and multi-zone systems.
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Fast and transparent service , with a clear estimate before work.
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From complete coverage of Greater Montreal .
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Technical support available 7 days a week during peak season.
Your comfort deserves more than just a repair—it deserves AirGreen quality .