A call in the middle of Montreal winter
When a Plateau-Mont-Royal resident contacted us one February morning, his concern was clear: his Fujitsu wall-mounted heat pump was no longer heating his apartment properly. Despite the frigid temperatures, the unit was blowing lukewarm air and struggling to maintain indoor comfort. At AirGreen , we know that in the Plateau's typical urban buildings—with their modern facades and high-mounted outdoor units—access and diagnosis require both rigor and precision.
On-site diagnosis: weakened performance
Upon our arrival, our certified technician conducted a complete inspection of the outdoor unit . Accessing the equipment using a secure ladder, he immediately checked:
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Refrigerant pressure using an electronic manifold;
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The compressor and the fan ;
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Electrical and thermal connections exposed to winter conditions;
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The status of automatic defrosting .
The verdict was quickly confirmed: the system was partially lacking refrigerant, reducing its efficiency and preventing the compressor from generating sufficient heat. No apparent leaks were visible to the naked eye, but slight oily traces around a connection indicated a microleak in the refrigeration line .
Targeted and lasting repair
Rather than simply recharging the system, our team applied the AirGreen method: repair before recharging .
We have :
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Isolated the faulty segment ;
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Performed a nitrogen pressure test to confirm the leak;
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Replaced the faulty flare fitting ;
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Performed a full recharge with R410A according to the manufacturer's specifications;
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Checked energy efficiency and indoor blowing temperature after recommissioning.
Thanks to this methodical approach, the heat pump returned to its nominal capacity within minutes, with an optimal COP for low winter temperatures.
The Plateau challenge: limited space and urban conditions
Working in the Plateau-Mont-Royal often means working in restricted access conditions : narrow alleys, units installed high up on modern facades, and limited passages for tools.
Our technicians are trained for these complex environments, using:
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Telescopic ladders suitable for urban structures;
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Accurate digital pressure gauges even in extreme cold;
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Enhanced security procedures to protect equipment and facade.
Every detail counts. In an urban setting, a poorly anchored wall, a loose screw, or an exposed cable can cause vibrations that are audible to neighbors or premature wear on the compressor.
Result: comfort restored and customer reassured
After the repair, the customer immediately noticed the difference:
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Constant warm air at 24°C in the living room;
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Reduced noise level;
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No vibration transmitted to the facade.
We also recommended annual preventative maintenance before each winter to avoid this type of problem, especially on units exposed to winds and urban salt.
Why choose AirGreen for your HVAC service in Montreal
At AirGreen , every HVAC service call is handled with the same attention to detail, whether it's a refrigerant leak , a defrost issue , a faulty circuit board , or simple performance maintenance .
Our advantages:
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Certified and trained technicians on brands like Fujitsu, Gree, Sharp, Midea, and more;
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Guaranteed repairs , compliant with RBQ and CCQ standards;
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Rapid interventions throughout Greater Montreal: Plateau-Mont-Royal, Laval, Longueuil, North Shore and South Shore;
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Transparent service , no surprises, with a clear report on each intervention.
Recommended Maintenance for Fujitsu Heat Pumps
Regular maintenance of your Fujitsu wall-mounted heat pump allows:
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To ensure optimal performance even at -20°C;
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To prevent micro-leaks or pressure losses;
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To prevent ice from forming on the coil;
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To extend the life of the compressor and electronic cards .
We recommend two maintenance sessions per year: one before the cold season, another before summer, to ensure maximum heating and air conditioning efficiency.
Our AirGreen commitment
On every service call, we implement our philosophy: precision, reliability and transparency .
We don't just repair: we optimize.
Thanks to our experience across Montreal, Laval, Longueuil, the North Shore and the South Shore, we know that each building has its own particularities—and so does each HVAC system.