A service call for a yellowed but still faithful wall-mounted air conditioner
At AirGreen , we regularly work on ComfortStar wall-mounted air conditioners , a brand found in many homes in Greater Montreal . This call came from a customer in Saint-Lambert , on the South Shore , whose unit, although old, had always served well… until it suddenly stopped properly cooling his living space.
Initial diagnosis: loss of efficiency and reduced ventilation
The customer reported a loss of cooling power and a weaker airflow . Upon arrival, our technicians observed a front panel that was yellowed by age —a classic sign of a unit with several years of service—but still mechanically sound.
After a thorough inspection:
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The air filter was clogged with dust.
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The evaporator fins had a slight buildup of dirt.
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The indoor fan was making an intermittent noise.
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And most importantly, the refrigerant level seemed low, indicating a micro-leak in the circuit.
Repair Steps
Our experts proceeded according to the AirGreen protocol:
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Thorough cleaning of the front panel, filter and evaporator with a biodegradable cleaner.
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Pressure test of the circuit to locate the leak, carried out using a tracer gas.
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Repair of the leak detected at the copper coil connection.
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Refrigerant recharge according to ComfortStar manufacturer specifications.
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Lubrication and balancing of the indoor fan motor to correct noise and stabilize airflow.
Result: restored comfort and optimized performance
After these interventions, the air conditioner resumed its optimal functioning. The customer immediately noticed a more powerful air flow , a stabilized ambient temperature , and above all, a reduced noise level .
This type of upgrade significantly extends the life of ComfortStar units, often well beyond their initial warranty.
AirGreen Tips for ComfortStar Air Conditioner Owners
Our technicians recommend:
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Clean the filters every 4 to 6 weeks during the summer.
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An annual preventive inspection , before the hot season, to detect any gas loss or drainage problems.
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Avoid delaying small repairs , as a microleak can reduce energy efficiency by up to 30%.
AirGreen Expertise on the South Shore
At AirGreen Climatisation & Chauffage , we operate in Saint-Lambert , Brossard , La Prairie , Varennes and throughout the South Shore of Montreal .
Our RBQ and CCQ certified teams ensure fast, precise and durable HVAC repairs , regardless of the model or brand.
Thanks to our rigorous approach and attention to detail, we have once again succeeded in bringing a ComfortStar wall-mounted air conditioner back to life without a complete replacement—a substantial savings for the customer and guaranteed satisfaction.
AirGreen Air Conditioning & Heating – HVAC repair experts in Montreal, Laval, Longueuil, North Shore and South Shore.