A deep cleaning to restore clean air and optimal performance
At AirGreen , we know that the proper functioning of a wall-mounted heat pump depends as much on its technology as on its regular maintenance. This is what we demonstrated during a service call in Brossard , where a customer contacted us for a lack of heating efficiency and an unpleasant odor emanating from his Fujitsu indoor unit.
Behind these symptoms, we are often dealing with a clogging of the evaporator coil and the condensate tray , especially after several seasons without professional cleaning. This intervention was an opportunity to refurbish a device essential to the customer's daily comfort.
Initial diagnosis: dust accumulation and bacterial growth
Upon arrival on site, our technician immediately identified two signs of neglected maintenance :
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A noticeable drop in airflow at the outlet of the indoor unit.
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A smell of stagnant humidity , typical of bacterial proliferation on the coil fins.
The unit, a Fujitsu 12,000 BTU wall-mounted inverter , was visibly showing widespread fouling of the evaporator module. The customer, despite regularly cleaning the filters with water, was unaware that the interior of the system accumulates dust, spores, and oily deposits over time, creating a breeding ground for mold.
Preparation of the intervention area: AirGreen protection and rigor
Every AirGreen interview begins with careful preparation of the work area .
Our technician has:
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Deployed a waterproof containment tarpaulin around the wall unit to prevent any splashing on walls and furniture.
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Place a collection bucket under the drain to collect the rinse water.
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Positioned a secure ladder and additional lighting for optimal visibility inside the coil.
This rigor guarantees clean, controlled and mess-free cleaning , even in neat residential environments like the client's.
Step 1: Disassembly and internal inspection
After removing the cover, filters and baffles, the evaporator coil was found to be covered in a film of dust and grease, typical of prolonged use without professional maintenance.
The objective: to restore free air circulation and heat exchange .
The technician used a handheld UV lamp to detect traces of biofilm, and inspected the tangential fan motor , which is often clogged and responsible for whistling or unbalanced airflow .
Step 2: Apply AirGreen biodegradable cleaner
We then applied a professional pH neutral detergent , designed specifically for wall-mounted HVAC units. This product removes:
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Organic deposits (pollen, dust, mold).
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Bacteria responsible for odors.
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Oily residue accumulated on the fins.
The product acts for a few minutes before rinsing under low pressure of lukewarm water , so as not to deform the aluminum coil.
The condensate tray was also emptied, cleaned and disinfected, and the drainage pipe was then purged using an air pump to ensure smooth flow.
Step 3: Cleaning the fan and sensors
The fan roller , an often neglected part, was disassembled and brushed manually. The blades were covered in a sticky deposit preventing good air propulsion.
The technician also cleaned the temperature and airflow sensors , to avoid reading errors that can distort the system's inverter regulation.
This complete cleaning allowed the heat pump to be returned to its original state of performance , while permanently eliminating damp odors.
Step 4: Drying, performance testing and final verification
After complete reassembly, the heat pump was started in air conditioning mode to check:
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Air flow (measured by flow meter).
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The blowing temperature (from 18°C before cleaning to 7°C after intervention).
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The noise level was significantly reduced after removing the fan deposits.
The system was then tested in heating mode to confirm optimal heat output and smooth defrosting .
Result: healthy air and restored efficiency
Thanks to this professional cleaning:
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Energy efficiency has been improved by approximately 20%.
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The indoor air has become healthy and odorless again.
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The customer noticed an immediate difference in air quality and blowing power .
This intervention demonstrates that even a high-performance device like a Fujitsu wall-mounted device requires regular maintenance to maintain its durability and efficiency.
AirGreen expertise in Brossard
Our AirGreen technicians operate in Brossard, Longueuil, Laval, Montreal and on both shores to maintain and repair all brands of wall-mounted heat pumps: Fujitsu, Sharp, Midea, Gree, Lennox, Zephyr and many others.
Each interview follows a precise protocol, guaranteeing our clients:
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Cleaner, healthier air.
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Maximum energy efficiency.
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Extended equipment life.
In conclusion: preventive maintenance, lasting comfort
This service in Brossard perfectly illustrates the AirGreen philosophy: intervening before the problem becomes a breakdown.
A complete cleaning of your wall-mounted heat pump isn't just a maintenance task—it's an investment in your home's quality of life and energy performance.