Repair of a Comfort Aire wall-mounted air conditioner in Sainte-Thérèse

An AirGreen intervention where precision and expertise meet

At AirGreen , every service call is an opportunity to demonstrate our expertise in HVAC repair in the greater Montreal, Laval, and North Shore areas. Today, we're taking a look back at an intervention carried out in Sainte-Thérèse , where a Comfort Aire wall-mounted air conditioner was showing signs of declining performance after several seasons of intensive use.

---

Diagnosis: an air conditioner that blows lukewarm despite an active compressor

Our technician, armed with his infrared thermometer , first checked the supply air temperature and the ambient air temperature. The unit displayed 24.1°C —a clear indication that the system was no longer cooling efficiently. The outdoor compressor was running, but the air outlet temperature was too high for active cooling mode.

Further inspection revealed:

• An evaporator coil clogged with dust and fine particles;

• A dirty air filter , not replaced for over a year;

• A slightly low refrigerant level , suggesting a micro-leak in the circuit.

---

Repair steps: a targeted and methodical refurbishment

To bring this Comfort Aire wall-mounted air conditioner back to life, our team carried out several coordinated actions:

1. Deep cleaning of the inner coil using a biodegradable, no-rinse product, thus optimizing heat transfer.

2. Complete replacement of air filters , ensuring better flow and superior air quality in the room.

3. Nitrogen leak test to locate the microleak. It came from a slightly loose flare fitting —a common problem often caused by thermal expansion cycles.

4. Recharge with R-410A refrigerant according to Comfort Aire manufacturer's nominal pressures.

5. Final check of the temperatures at the diffuser outlet: the thermometer now displayed 17.8°C , proof that optimal performance had been restored.

---

Restored comfort and extended durability

After the repair, the customer noticed an immediate improvement in indoor comfort. Cold air circulated evenly and the humidity level had decreased. We also:

• Checked the condensate drainage to prevent any risk of overflow;

• Inspected the electrical contacts of the control module;

• Scheduled a biannual preventive maintenance , in order to avoid any relapse before the next heatwave.

---

Why call AirGreen for your wall system repair?

Our interventions are based on three pillars: precise diagnosis, lasting repair and complete transparency . Each client receives a detailed report including:

• Temperature values ​​before and after the intervention ;

• Actions carried out and parts replaced ;

• Personalized recommendations to extend the life of the device.

Our team operates throughout Greater Montreal , whether in Laval, Longueuil, on the North Shore or the South Shore , for any type of wall-mounted air conditioner or heat pump — Comfort Aire , Gree , Fujitsu , Midea , Sharp , or Zephyr models.

---

AirGreen Tips: Maintaining the Performance of Your Wall-Mounted Air Conditioner

To avoid recurring breakdowns, our experts recommend:

• Clean the filter every 4 to 6 weeks during the summer season;

• Have the refrigerant pressure checked once a year;

• Avoid setting the air conditioner to “too cold” mode (less than 18°C), which increases condensation and the load on the compressor;

• To watch for unusual sounds (clicking, whistling, vibrating), often signs of an impending problem.

---

Final result: 100% efficiency restored

Thanks to a rigorous approach and cutting-edge diagnostic tools, our AirGreen team was able to restore this Comfort Aire wall-mounted air conditioner to its original performance . The owner now enjoys stable, quiet, and energy-efficient cooling , perfect for Quebec summers.

---

Conclusion

At AirGreen, we believe that a successful HVAC repair isn't just about "making it cold again"—it's about sustainably optimizing the comfort and reliability of your system . This philosophy guides each of our interventions, from Sainte-Thérèse to Montreal , including Laval and Longueuil .