Haier wall-mounted air conditioner repair in Côte-des-Neiges–Notre-Dame-de-Grâce

When an old wall-mounted air conditioner shows signs of weakness

At AirGreen , we regularly operate in Montreal , particularly in the Côte-des-Neiges–Notre-Dame-de-Grâce area, where older buildings are often equipped with Haier wall-mounted air conditioners installed several years ago. This type of unit, although efficient, requires careful maintenance to maintain optimal performance, especially after more than ten years of service.

During this service call , our customer contacted us after noticing that his wall unit was no longer cooling properly and that an irregular ventilation noise had been heard for several days.

Accurate diagnosis of a Haier wall-mounted air conditioner

Upon arrival, we carried out a complete inspection of the indoor unit . This Haier model, although robust, showed several signs of aging:

• Filters clogged with dust, restricting airflow;

• Dirty evaporator coil , reducing heat transfer;

• Slight leak of R410A refrigerant , causing reduced cooling efficiency;

• Slightly unbalanced interior fan , causing the reported noise.

To confirm the diagnosis, we measured the refrigerant pressure and the blow-off temperature . The data confirmed a performance deficit of approximately 25% compared to the manufacturer's standards.

Haier Unit Repair and Refurbishment

Our technicians followed a complete intervention protocol:

1. Deep cleaning of filters and coil using a biodegradable cleaner specific to HVAC systems;

2. Tightening electrical connections and checking the control board;

3. Rebalanced the fan to eliminate vibration noise;

4. Search and seal the micro-leak using an electronic detector, then recharge with R410A refrigerant gas according to the pressures prescribed by Haier;

5. Final performance test including temperature differential and airflow control.

The result was immediate: the unit regained constant cold blowing , the noise had disappeared, and the measured energy consumption had become stable again.

Why maintain a Haier wall-mounted air conditioner regularly

This case illustrates a common problem: lack of regular maintenance leads to dirt buildup, minor leaks, and ultimately, decreased performance. At AirGreen, we recommend a comprehensive annual maintenance program that includes:

• Cleaning the evaporator coil and condenser ;

• Checking the refrigerant charge ;

• Inspection of condensate and drainage system;

• Electrical testing of main components;

• Antibacterial disinfection for indoor air quality.

Such preventive maintenance helps avoid costly breakdowns and extend the system's lifespan by several years.

Guaranteed customer satisfaction in Côte-des-Neiges–Notre-Dame-de-Grâce

At the end of the intervention, our client found immediate thermal comfort , with a stable temperature and silent operation. We took the time to explain good maintenance practices, including:

• Clean the filters every 2 to 3 months ;

• Avoid blocking air circulation around the unit ;

• Schedule a professional interview in the spring before the warm season.

This type of personalized service, combined with our technical expertise, has made AirGreen 's reputation in the greater Montreal area, Laval, Longueuil, the North Shore and the South Shore .

In summary

A Haier wall-mounted air conditioner can provide excellent comfort, but it must be maintained and repaired by certified HVAC technicians . Thanks to our accurate diagnosis and expertise, the Côte-des-Neiges–NDG customer's unit is now working like new, ready to face the summer heat.

AirGreen — your trusted HVAC expert in Montreal.
Specialists in repair, maintenance and installation of wall-mounted air conditioning systems of all brands: Haier, Fujitsu, Gree, Midea, Sharp, Trane, Lennox, Goodman , and many others.