A revealing service call: loss of power and lukewarm air
One July morning, a customer in Montreal 's Côte-des-Neiges neighborhood contacted us about a problem with his Gree wall-mounted heat pump . His unit, installed a few years ago, was no longer able to effectively cool his apartment despite regular maintenance. The blown air was lukewarm, even when the outdoor compressor seemed to be operating normally.
Our AirGreen team visited the site the same day. In the photo taken during the diagnosis, we can see our technician measuring the supply temperature using an infrared thermometer . The result was clear: 21.0 °C at the outlet, while a system in good condition should have displayed between 10 and 13 °C .
Detailed analysis of the situation
Our checks were carried out methodically:
-
Air inlet and outlet temperature test : a difference of less than 5°C is insufficient for good performance.
-
Evaporator coil inspection : Slightly clogged with fine dust and accumulated particles.
-
Fan airflow control : normal, no noise or mechanical imbalance.
-
Refrigerant pressure (R-32) : slightly below nominal value, indicating a microleak .
-
Compressor discharge temperature : stable, indicating that the motor was operating correctly.
The final diagnosis therefore pointed to a partial loss of refrigerant combined with internal fouling of the coil . These two factors reduced the unit's ability to absorb and transfer heat efficiently.
Steps of repair
Once the problem was confirmed, our technicians took the following actions:
-
Complete cleaning of the coil with dry steam , without dismantling the main panel, to preserve the electronic components;
-
Checking and tightening flare fittings on the fluid line;
-
Accurate R-32 circuit recharge , measured to the nearest gram according to the Gree nameplate;
-
Thermal performance test after system stabilization, monitoring the temperature with a laser thermometer.
After the intervention, the air outlet temperature dropped from 21°C to 11.8°C , confirming a return to full cooling capacity.
Result: restored performance and immediate comfort
The customer immediately noticed a tangible difference: rapid cooling, more uniform airflow and quiet operation . The previously sluggish unit was now back to optimal energy efficiency.
Our technicians also took the time to explain the essential preventive measures to follow to avoid the problem recurring:
-
Clean the air filters every month during the summer period;
-
Maintain a minimum clearance of 15 cm around the wall unit;
-
Schedule an annual professional service before the warm season to check pressure and connections.
The AirGreen approach: precision, transparency and sustainability
At AirGreen , we believe that good HVAC service is based on three pillars: thoroughness of diagnosis, quality of execution, and transparency of results . In this specific case, our intervention in Côte-des-Neiges not only restored the customer's comfort, but also extended the life of their Gree system.
Our teams, active across Montreal, Laval, Longueuil, the North Shore and the South Shore , have advanced measuring equipment and follow certified protocols to guarantee fast, reliable service that complies with Quebec energy standards .
Technical assessment of the intervention
-
Brand: Gree
-
Type: Wall-mounted heat pump (mini-split)
-
Refrigerant: R-32
-
Problem: micro-leak and fouling of the coil
-
Interventions: steam cleaning, tightening, fluid refill
-
Result: blowing temperature reduced to 11.8°C, optimal performance
Local service, measurable results
This case illustrates the importance of accurate diagnosis and professional tools . Using infrared thermometer measurements, we were able to objectively confirm system performance before and after repair. This technical rigor is at the heart of our service philosophy.
For any repair or maintenance of a Gree or other brand wall-mounted heat pump , trust AirGreen , your local HVAC partner. We guarantee fast service, durable solutions, and restored comfort, whatever the season.