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Réparation d’un climatiseur mural North Cool à Sainte-Thérèse
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North Cool wall-mounted air conditioner repair in Sainte-Thérèse

When the performance of a North Cool wall-mounted air conditioner decreases as summer approaches

At AirGreen , we often receive calls as the first warm weather arrives: customers notice that their wall-mounted air conditioner is no longer blowing cold air or seems less efficient than usual. This was precisely the case for one of our customers in Sainte-Thérèse , on the North Shore of Montreal , who had a North Cool system installed on the wall of his red brick house.

The customer contacted us after noticing that his outdoor unit was making an abnormal noise and that the indoor temperature was no longer dropping, even after several hours of operation.

Diagnosis: An electrical and wiring insulation problem

Upon our arrival on site, we carried out a complete diagnosis of the wall-mounted North Cool system . Our technicians noted that:

  • The compressor was not starting properly.

  • The outdoor fan was running intermittently.

  • The electrical wiring connecting the outdoor and indoor unit showed signs of wear and moisture.

Upon opening the connection panel, we discovered a poor contact on the main power supply, caused by water infiltration through the wall duct. This type of problem, common in outdoor installations exposed to sun and rain, can lead to complete compressor failure if not corrected quickly.

Intervention: securing and complete upgrade

Our technicians undertook a thorough repair , step by step:

  1. Turn off the power supply and check the circuit breaker completely.

  2. Cleaning and drying the electrical compartment.

  3. Replacement of damaged power cable and repair of wall conduit insulation .

  4. Application of a waterproof sealant to prevent any future infiltration.

  5. Compressor and fan test to validate restart.

  6. R-410A refrigerant pressure measurement and circuit rebalancing.

After these adjustments, the North Cool wall-mounted air conditioner regained its full efficiency: stable temperature, quiet operation, and optimized energy consumption.

Why do these problems often occur?

Exterior wall installations like this are exposed to:

  • extreme temperature variations ,

  • corrosion due to humidity ,

  • and building movements which can weaken conduits and cables.

Annual preventive maintenance , carried out by a professional, allows you to:

  • detect early signs of overheating or oxidation,

  • clean the condenser coil,

  • check the refrigerant gas pressures,

  • and secure electrical connections.

AirGreen expertise: rigor, safety and sustainability

At AirGreen, we combine accurate diagnosis with long-lasting interventions . For each service call, we take the time to:

  • explain to the customer the exact cause of the problem ,

  • offer a sustainable and economical solution ,

  • and check the entire system before leaving the premises.

In this specific case, our team also recommended to the client:

  • to schedule an annual inspection of the condenser ,

  • to check the cleanliness of the internal filter every four weeks,

  • and keep the area around the outdoor unit clear for good airflow.

Result: Restored comfort and peace of mind

A few hours after our intervention, the customer confirmed that his North Cool air conditioner was working like new again. Thanks to this repair, he was able to avoid a costly replacement and extend the life of his system by several years.

This intervention perfectly illustrates our mission: to guarantee the reliability and performance of HVAC systems throughout Sainte-Thérèse and on the North Shore .

In summary

  • Brand : North Cool

  • Type : Wall-mounted air conditioner

  • Location : Sainte-Thérèse (North Shore of Montreal)

  • Problem : Electrical failure and water infiltration in the wiring

  • Solution : Wiring replacement, sealing, refrigerant rebalancing

  • Result : System restored, efficiency and comfort restored

At AirGreen , we pride ourselves on providing fast, meticulous service tailored to every situation. Whether it's for repair , maintenance , or installation of a wall-mounted air conditioner or heat pump , our team is here to ensure your comfort in all seasons —in Montreal , Laval , Longueuil , and throughout the North Shore and South Shore .