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Réparation d’une thermopompe murale North Cool à Sainte-Rose
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Repair of a North Cool wall-mounted heat pump in Sainte-Rose

Fast diagnosis and efficient repair by AirGreen

At AirGreen , we were recently called for an urgent repair of a North Cool wall-mounted heat pump in a residence in Sainte-Rose , Laval . The customer had noticed that their unit was no longer producing cold air, even when the compressor seemed to be operating normally. This type of failure is common on wall-mounted units after several years of continuous use, especially when annual maintenance has not been performed.

Context of the service call

The client contacted us after several days of intense heat. His North Cool heat pump , installed about five years ago, was no longer able to cool the house. According to his observations:

  • the outside fan was running, but without cooling power;

  • a slight metallic noise could be heard inside the unit;

  • the remote control no longer allowed the temperature to be changed effectively.

Upon arrival, we performed a complete inspection of the HVAC system , starting with the electrical and refrigeration components.

Step 1: In-depth technical diagnosis

Our certified technicians quickly identified several elements to check:

  1. Abnormal refrigerant pressures : The pressure gauge indicated too low a pressure, indicating a possible refrigerant leak .

  2. Compressor overheating : high crankcase temperature, caused by lack of fluid.

  3. Dust accumulation in the indoor unit , limiting air circulation and amplifying defrost cycles.

After a nitrogen leak search, we detected a micro-leak on a flare fitting at the condenser outlet, possibly due to repeated vibration over the seasons.

Step 2: Repair and repressurization

Once the leak is located, our technicians:

  • redid the flare joint with a new nut and a reinforced copper fitting;

  • performed a leak test at 450 psi to confirm the system's performance;

  • carried out a complete vacuum to eliminate any residual moisture;

  • recharged the system with R410A refrigerant to North Cool's exact specifications.

Step 3: Cleaning and Preventive Maintenance

To ensure the long-lasting performance of the installation, we also have:

  • cleaned the coils of the indoor unit with a biodegradable solution;

  • replaced the clogged washable filter with a high-efficiency antibacterial model;

  • tightened the fixings of the exterior wall bracket, exposed to vibrations and corrosion.

The electrical box, well protected by a waterproof sheath, was inspected to verify the continuity of the control wires and grounding. No anomalies were detected.

Results after intervention

After restarting the system, the North Cool heat pump quickly returned to optimal performance:

  • indoor blowing temperature at 18°C ;

  • pressures and subcooling in accordance with manufacturer's standards;

  • Compressor noise reduced by 40% thanks to new system balancing.

The customer was able to observe uniform cooling in all rooms and stabilized energy consumption .

Causes of breakdown: prevention and advice

This case illustrates the importance of regular maintenance of HVAC systems. An undetected microleak can have several consequences:

  • progressive loss of refrigerant, therefore of efficiency;

  • increased stress on the compressor and seals;

  • overheating of electrical components.

At AirGreen, we recommend:

  • a complete annual maintenance before summer;

  • cleaning the indoor coil every 6 to 8 months;

  • visual inspection of the wiring and external support after each winter.

Why trust AirGreen

Our team of HVAC experts in Laval and the greater Montreal area stands out for:

  • exceptional responsiveness for urgent service calls;

  • precise diagnoses supported by certified instruments ;

  • in-depth knowledge of brands such as North Cool, Fujitsu, Midea, Gree, Zephyr and Lennox;

  • interventions that comply with current safety and environmental standards .

Every repair performed by AirGreen comes with a detailed technical report and personalized recommendations to extend the life of the device.

Conclusion: comfort restored thanks to local expertise

Thanks to our quick and methodical intervention, this North Cool wall-mounted heat pump is now working like new. The Sainte-Rose customer once again benefits from consistent comfort , controlled temperature and optimal energy efficiency — all supported by the expertise of AirGreen , the trusted HVAC specialist in Montreal, Laval, Longueuil, the North Shore and the South Shore .