A roofing service call: expertise and precision guaranteed
At AirGreen , our services aren't limited to ground-based residences. We also perform numerous HVAC repairs on rooftop installations , such as this recent service call in Côte-des-Neiges , in the heart of Montreal. The client, the owner of a residential building, had noticed that one of his Midea systems was no longer producing sufficient cooling despite seemingly normal operation.
On-site diagnosis: signs of loss of yield
Upon arrival, our team undertook a thorough inspection of the outdoor condenser . The compressor would start, but the indoor discharge temperature remained lukewarm. To confirm our suspicions, we connected a dual-gauge manifold to analyze the refrigeration circuit pressures. The results quickly showed an abnormally low suction pressure , a sign of a refrigerant leak .
The first items to check included:
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the condition of the flare fittings ;
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copper tubing exposed to temperature variations;
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and welds near the compressor.
Steps of repair
Our certified technicians methodically located and corrected the leak :
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Leak detection using a high-sensitivity electronic detector.
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Repair of the offending joint by brazing with the addition of a copper-silver alloy.
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Complete cleaning of the circuit with dry nitrogen to eliminate moisture and impurities.
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Pressure tested to 350 psi for 30 minutes.
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R410A refrigerant recharge , precisely calibrated to Midea model specifications.
The operation was carried out rigorously, ensuring that each parameter of the system complied with the manufacturer's standards.
Final check and return to service
Once the heat pump was recharged, we performed a complete performance test :
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Balanced and stable pressures.
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Blowing temperature measured at 7.9°C at the indoor air outlet.
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Power consumption in accordance with original values.
The aircraft returned to full performance, and occupant comfort was restored without delay.
The importance of preventive roof maintenance
Rooftop heat pump installations, such as this one, are particularly exposed:
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to extreme temperature variations between seasons;
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to the accumulation of debris and dust ;
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to structural vibrations which can damage refrigeration connections.
This is why we recommend that building and multiplex owners carry out professional annual maintenance , including:
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cleaning the coil and fan;
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pressure and temperature test;
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electrical inspection and tightening of terminals;
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refrigerant charge check.
These preventive checks extend the life of the compressor and prevent costly leaks.
AirGreen: the benchmark in HVAC service in Montreal
This intervention illustrates the AirGreen philosophy : technical rigor, transparency and customer satisfaction. Whether your system is a Midea , Fujitsu , Gree , Lennox , Trane or other, we have the tools and experience to quickly diagnose and repair any HVAC failure .
We operate throughout Greater Montreal , including Laval , Longueuil , the South Shore and the North Shore . Each service call is carried out by certified technicians trained in the latest HVAC technologies.
With proper maintenance , your heat pump can continue to provide stable performance, controlled energy consumption and lasting comfort all year round.