Professional cleaning to bring a clogged heat pump back to life
Nothing beats proper maintenance to preserve the performance of a wall-mounted heat pump . This is precisely what we demonstrated during a service call in Blainville , on the North Shore of Montreal , where a customer contacted us after noticing that his unit was blowing less cold air and producing an irregular flow of water along the wall.
At first glance, it appeared to be a Fujitsu model installed in a bedroom. As is often the case, the cause of the problem lay in a lack of regular maintenance .
Diagnosis: accumulated dust and partially blocked drain
As soon as the hood was opened, our technicians noticed significant fouling of several components:
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Filters saturated with dust and textile fibers, common in rooms with carpets or thick bedding.
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Evaporator coil covered with a thin layer of grease, reducing heat exchange.
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Blocked condensate drain , causing water to stagnate inside the tank.
This type of buildup is not uncommon: over time, even a high-performance system like a Fujitsu inverter-based system will lose efficiency if air no longer circulates freely through the evaporator.
Intervention: complete cleaning under tarpaulin and refurbishment of the evacuation circuit
To prevent water overflow or splashing, our technicians have installed a professional wash cover , securely attached under the wall unit. This device directs rinse water directly into a drain pipe, ensuring safe and mess-free cleaning .
The interview took place in several key stages:
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Complete removal of air filters and soaking in a disinfectant solution.
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Application of a biodegradable detergent to the evaporator coil.
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Low pressure rinse to dislodge embedded dirt without damaging the fins.
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Thorough cleaning of the turbine (centrifugal fan), often neglected but essential for performance.
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Disinfection of the condensate tray and drain , to eliminate mold and biofilms.
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Check that the drain pipe is draining properly outside.
During the intervention, our team also checked the temperature sensor and the speed of the blower motor , two critical elements for the proper functioning of the heat pump.
Result: restored efficiency and improved comfort
Once the cleaning was complete, the customer noticed an immediate improvement in airflow and temperature . The unit was once again blowing cool, dry air, without any noise or damp smell.
We also measured:
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A 25% increase in airflow compared to before cleaning.
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A 2°C drop in blowing temperature, a sign of more efficient heat exchange.
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Reduced power consumption , proof that the device was operating at full capacity again.
Why an annual interview is essential
Even the best brands like Fujitsu , Mitsubishi , Gree or Daikin require periodic maintenance for:
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Prevent water leaks due to clogged drains.
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Prevent bad odors linked to stagnant humidity.
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Reduce energy consumption .
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Extend the life of the compressor and indoor motor .
At AirGreen , we recommend a complete maintenance at least once a year , ideally before the summer season, so that the heat pump operates optimally during hot weather.
AirGreen: HVAC experts serving residential comfort
Our technicians serve the entire North Shore , including Blainville , Boisbriand , Terrebonne , Lorraine and Sainte-Thérèse , as well as Montreal , Laval , Longueuil and the South Shore . Each service is carried out according to the highest standards in the HVAC industry:
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Eco-friendly products approved for residential use.
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Specialized equipment for cleaning under tarpaulin.
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Complete performance check after each intervention.
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Fast, courteous and guaranteed service .
Conclusion: a simple interview, but with major effects
This service in Blainville demonstrates once again that regular maintenance is not a luxury, but a necessity. In just a few hours, our client regained the comfort and freshness he had lost for weeks, while extending the life of his Fujitsu heat pump .
At AirGreen , we do more than repair—we maintain, preserve, and optimize every HVAC system to keep your comfort consistent, season after season.