A typical Montreal service call: comfort disrupted in a Rosemont duplex
At AirGreen , we often receive calls in early summer regarding breakdowns of wall-mounted heat pumps installed in Montreal's typical brick duplexes. On that day, our team visited a building in the Rosemont–La Petite-Patrie neighborhood, where a customer reported that their Midea heat pump was no longer producing cold air, even though an outdoor fan was still running.
The outdoor unit, securely mounted on the back wall of the brick building, suggested an installation about five years old—a Midea model from the R32 range , known for its reliability but requiring, like any HVAC unit, regular maintenance.
Complete on-site diagnosis
Upon our arrival, our technicians carried out a series of checks:
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Electrical inspection : stable supply voltage, no tripped circuit breakers.
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Control signal check : the internal board was sending the signal to the compressor correctly.
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R-32 refrigerant pressure measurement : values significantly lower than normal, indicating a possible leak in the circuit .
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Visual observation : slight trace of oil around a flare connection near the condenser.
The diagnosis was clear: a refrigerant leak at the outdoor unit's connection. This is a common problem, often caused by temperature fluctuations and the expansion of metals over the seasons.
Repair carried out: precision and safety
To correct the issue, we took the following steps:
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Complete recovery of remaining refrigerant using our recovery station, in accordance with environmental standards.
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Disassembly and cleaning of the flare fitting , then remanufacturing of the seal with a new nut and tightening calibrated to the torque recommended by Midea.
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Nitrogen leak test at 300 psi for 30 minutes: no signs of leakage.
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Completely vacuum the circuit to -30 inHg for 45 minutes to eliminate any residual moisture.
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Accurate R-32 refill according to model nameplate.
Finally, we conducted a performance test : the heat pump returned to optimal performance with a temperature difference of 11°C between the indoor air inlet and outlet — proof of effective cooling.
Result: restored comfort and optimized performance
The customer, who had endured several days of heat without air conditioning, immediately noticed the difference. Fresh air was once again circulating throughout the apartment. Thanks to the precise recharge and professional tightening of the connection , the unit's energy performance returned to its original level, also reducing the risk of future refrigerant losses.
We also took advantage of our presence to clean the indoor coil and remind the customer of the importance of annual preventative maintenance , particularly for devices running on R-32, which are more sensitive to pressure.
AirGreen tips to avoid this type of breakdown
A refrigerant leak can go unnoticed for weeks. Here are some signs that should alert any wall-mounted heat pump owner:
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Gradual reduction of cold or heating.
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Presence of frost on the pipes or fins of the condenser.
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Unusual noise coming from the outdoor unit.
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Increased electricity consumption.
At AirGreen, we recommend:
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A biannual visual inspection (spring and fall).
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Annual professional cleaning of the interior and exterior system.
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A refrigerant pressure check every two years, especially for wall-mounted installations exposed to sunlight or structural vibration.
AirGreen expertise: the Montreal difference
This intervention in Rosemont illustrates our approach: precise technical expertise , rigorous diagnosis , and human and transparent service . Each repair is an opportunity for us to ensure not only the immediate comfort of our customers, but also the sustainability of their HVAC investment .
Our team travels throughout Montreal, Laval, Longueuil, the North Shore and the South Shore , for repairs on Midea, Fujitsu, Gree, Sharp, Zephyr heat pumps , and several other brands, whether for minor breakdowns or complete component replacements.
AirGreen — your trusted partner for residential HVAC system repair in Montreal and throughout Greater Montreal.