A typical service call turned into a lasting solution
At AirGreen , our teams of certified technicians work every day across the South Shore to restore HVAC systems essential to the comfort of Quebec families. One of our recent calls took us to Sainte-Julie , to a condominium where a Fujitsu wall-mounted heat pump was experiencing abnormally low performance, just at the beginning of a period of intense heat.
Initial diagnosis: a device that no longer cools efficiently
Our client noticed that her outdoor unit was running continuously, but the indoor temperature was no longer dropping. Upon our arrival, we undertook a complete inspection of the outdoor compressor , located on the balcony. The installation, although clean and well maintained, showed some signs of wear:
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Dust accumulation on the condenser fins ;
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Abnormal noises at startup ;
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And above all, a notable lack of pressure in the refrigerant circuit .
These symptoms quickly pointed our diagnosis towards a micro-leak of the R-410A refrigerant , a relatively common problem on units more than 7 years old.
Repair steps: rigor and precision for comfort
Our repair process always follows the same structured approach, ensuring reliability and durability:
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Visual inspection and pressure test
We used an electronic leak detector to pinpoint the problem area. The leak was coming from a slightly cracked copper fitting at the condenser outlet. -
Purging and brazing the pipe
After isolating the circuit, our technician performed silver soldering to reseal the damaged joint, then completely purged the system . -
Leak test and system recharge
The system was under nitrogen for several minutes to confirm leak tightness before recharging with R-410A according to Fujitsu specifications. -
Full cycle check
Finally, we performed a complete cooling cycle , measuring the evaporation and condensation temperatures: the values returned to normal ranges.
Results: restored performance and immediate comfort
The difference was immediately felt as soon as the intervention was completed. The heat pump blew air at 9°C cooler than the ambient air , ensuring a stable and pleasant temperature. The customer, delighted to be able to close her windows, highlighted the speed and clarity of our technical explanations .
Recognized AirGreen expertise in Sainte-Julie and throughout the South Shore
Our services aren't limited to repairs: we also offer preventative maintenance contracts to extend the lifespan of your HVAC units. This type of leak could have been detected earlier during annual maintenance—a service we highly recommend, especially for systems exposed to the elements, such as those installed on balconies.
We regularly work with reputable brands such as Fujitsu, Sharp, Gree, Midea, Daikin, Goodman and Tosot , ensuring repairs meet manufacturer standards. Each part replaced is chosen for its compatibility and durability .
Maintenance tips to prevent future breakdowns
For owners of wall-mounted heat pumps , here are some recommendations from our experience in the field:
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Clean the internal filters every 2 to 3 weeks during the warm season.
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Check the clearances around the outdoor condenser (minimum 30 cm on the sides).
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Avoid using extension cords to power the indoor unit.
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Have a professional service carried out every spring , before the start of the summer season.
These simple actions not only optimize energy performance, but also prevent leaks and electrical overloads .
Comfort restored, signed AirGreen
Thanks to this intervention, the Sainte-Julie customer once again benefits from a silent, energy-efficient and reliable system, ready to face the next heat waves.
At AirGreen , we put the same rigor and passion into every service call—whether it's a simple maintenance or a complete wall-mounted heat pump repair —everywhere in Montreal, Laval, Longueuil, on the North Shore and the South Shore .