A revealing service call: a yellowed but still going strong Carrier wall-mounted air conditioner
At AirGreen , we regularly receive calls from customers whose wall-mounted air conditioning systems are showing signs of aging or failure, but who are reluctant to replace them until they can be effectively repaired. This is exactly the case with this Carrier wall-mounted air conditioner installed in a residence in Sainte-Dorothée, Laval .
The customer, aware that his unit was over 15 years old, noticed that the interior temperature was no longer dropping as much as before and that the airflow seemed weakened.
Diagnosis: an old but still repairable device
Upon our arrival, our technicians performed a comprehensive diagnostic. The device, although yellowed by age, was structurally sound and had been relatively regularly maintained. However, several indicators revealed a loss of performance:
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Clogged air filters reducing circulation and cooling efficiency.
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Dirty evaporator coil , causing insufficient heat exchange.
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Low refrigerant level , indicating a small, slow leak in the circuit.
We also checked the condensate and noticed a slight accumulation of standing water, often related to a partially blocked drain.
AirGreen intervention: complete performance restoration
In order to bring this system back to life, our team carried out a series of specific interventions:
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Complete cleaning of the indoor unit with a biodegradable product designed to dissolve dust and grease on the evaporator fins.
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Suction and rinsing of the condensate drain , allowing smooth evacuation of water.
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Leak test of the refrigeration circuit with nitrogen, followed by a recharge with R410A refrigerant in accordance with current environmental standards.
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Cleaning the tangential fan to restore optimal airflow and quiet operation.
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Replacement of the interior temperature sensor , slightly defective and responsible for premature shutdown of the compressor.
In less than two hours, the air conditioner returned to performance close to its original level.
Result: restored comfort and extended longevity
At the end of the intervention, we measured a notable difference:
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Blown air temperature: 9°C lower than ambient air.
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Noise level reduced by 30%.
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Stable cooling cycle without excess power consumption.
The customer, delighted to avoid a complete replacement, was able to enjoy immediate comfort , especially during the hot days of the end of the Laval summer. We also recommended annual preventive maintenance to further extend the life of the unit.
AirGreen expertise: extending the life of your HVAC systems
Although replacing with a modern wall-mounted heat pump is sometimes unavoidable, our mission at AirGreen is always to objectively evaluate the most cost-effective solution for our customers.
In this case, repair was the best option, because:
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The compressor and electronic boards were still in good condition.
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Repair costs remained much lower than a complete replacement.
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The unit served a single room with moderate consumption.
We also took the time to explain to the customer the warning signs to look out for: decreased airflow, abnormal noises, frost on the copper line, or water leaks. Early detection often prevents more extensive repairs.
A local service throughout the Greater Montreal region
Our team responds quickly in Laval , Montreal , Longueuil , as well as on the North Shore and the South Shore .
Each AirGreen intervention follows the same principle: diagnose precisely, repair rigorously, and inform transparently .
Whether your device is a Carrier , Fujitsu , Gree , Sharp , Midea , or any other brand, our RBQ and CCQ certified technicians have the expertise to bring your system back to life.
To remember
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Brand: Carrier
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Type: Wall-mounted air conditioner
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Location: Sainte-Dorothée (Laval)
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Problem: Refrigerant leak, faulty sensor, low airflow
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Solution: Complete cleaning, R410A recharge, sensor replacement
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Result: Restored performance and immediate comfort
Is your wall system showing signs of weakness?
At AirGreen , we offer fast, professional and guaranteed service for all your residential HVAC repair needs in Montreal, Laval, Longueuil, the North Shore and the South Shore .
Our experienced technicians ensure the durability and performance of your equipment, regardless of its brand or age.