A customer inconvenienced by a loss of performance
A resident of Brossard , on the South Shore of Montreal, contacted us about a problem with the Comfortmaker wall-mounted air conditioner installed in the main hallway of his condo. The unit, usually discreet and efficient, was now only producing a light, warm breeze despite the temperature being set at 20°C. In the middle of February, this anomaly quickly led to a feeling of discomfort throughout the apartment.
At AirGreen , we know that a wall-mounted air conditioner used in heating mode (heat pump) in winter requires special attention: the slightest pressure imbalance or internal fouling can compromise the entire efficiency of the system.
Complete diagnosis of the indoor unit
Upon our arrival, our technician carried out a systematic analysis of the unit's operation :
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Air filter check : slightly clogged with fine dust;
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Evaporator inspection : dirt buildup on the fins, reducing airflow;
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Outlet temperature test : abnormally low deviation (barely 3°C);
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Checking the electronic board and temperature sensors.
These initial findings pointed to a problem with air flow and heat transfer , typical of units that have not been serviced for more than a year. However, intermittent noise and variations in blowing also suggested a clogged fan motor .
Technical intervention: performance refurbishment
The intervention took place in several meticulous stages:
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Complete disassembly of the inner housing to access the turbine and the motor.
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Thorough cleaning using steam and biodegradable products to remove dust, grease and microorganisms.
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Degreasing the tangential fan , often neglected during surface maintenance.
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Complete disinfection of the condensate tray to prevent unpleasant odors and the formation of biofilm.
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Reassembly and electronic calibration of the system after a full cycle test.
Once cleaning was complete, the airflow returned to its original power. Temperature measurements indicated a difference of 9°C between the air inlet and outlet—evidence of restored efficiency .
External verification and overall test
Although the fault appeared to be internal in origin, our team took care to check the outdoor compressor . We measured the refrigeration circuit pressures to rule out any leaks or reduced charge. The refrigerant level was correct, confirming that the cause of the problem was indeed linked to insufficient maintenance of the indoor unit.
Results and recommendations
After the intervention:
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The room temperature stabilized in less than 20 minutes;
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The noise level has decreased considerably;
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The customer found optimal thermal comfort , without drafts or vibrations.
We recommended bi-annual preventative maintenance , especially before peak seasons (spring and fall), to prevent dust buildup and extend the life of the Comfortmaker system.
The importance of regular maintenance
Many users underestimate the impact of a clogged filter or dusty evaporator . These minor problems reduce:
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The energy efficiency of the external compressor;
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The durability of electronic components ;
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Indoor air quality , often loaded with fine particles.
At AirGreen , we offer customized maintenance plans for homes, condos, and small businesses. These follow-ups include a complete cleaning, refrigerant gas check, and system calibration to ensure optimal operation all year round .
AirGreen Expertise in Brossard and throughout Greater Montreal
Our team works every day in Brossard, Longueuil, Laval, Montreal, the North Shore and the South Shore , on brands such as Comfortmaker, Gree, Sharp, Fujitsu, Midea and many others.
Thanks to our experience, we know how to adapt our methods to each environment: urban condos, single-family homes or multi-unit buildings.