A meticulous intervention to restore the efficiency of a residential wall-mounted heat pump
At AirGreen , we were recently called in for a complete cleaning of a wall-mounted heat pump in a Saint-Laurent apartment in Montreal. The client had contacted us after noticing a drop in performance from their system: the heat pump was still producing cool air, but less powerfully than before, and a slight musty odor was emitted when it was turned on.
Initial diagnosis: clogged filters and fins
During our inspection, we noted several signs of accumulated dirt inside the unit :
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Filters clogged with dust and household fibers, limiting air circulation.
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The heat exchanger fins were clogged , which reduced the heat exchange capacity.
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Traces of moisture and brownish residue visible on the lower flap, typical of a prolonged accumulation of dirt.
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Partially blocked drain , risking water leaks on the wall.
We also measured the blower temperature using an infrared thermometer : it read approximately 7.3°C , a reasonable value but slightly higher than what a well-maintained unit should produce under the same conditions. This confirmed the need for thorough cleaning .
Steps for cleaning a wall-mounted heat pump
Our team carried out a complete maintenance check, following the manufacturer's recommendations and AirGreen best practices:
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Safe dismantling of the front panel and filters
The filters were carefully removed and then washed in warm water with an eco-friendly detergent. We prioritize biodegradable products to protect the health of the occupants and the environment. -
Deep cleaning of the evaporator and fan
Using a low-pressure jet and a specific HVAC heat exchanger cleaner, we removed dust, grease, and the beginnings of mold. The fan blades, often neglected, were rinsed and disinfected. -
Antibacterial disinfection and deodorization
A disinfectant treatment was applied to all internal surfaces to eliminate bacteria and fungal spores , while also neutralizing bad odors. -
Condensation drain check
After a thorough rinsing, we tested the water flow to ensure the pipe was completely clear , thus preventing any future leaks. -
Reassembly and final performance test
Once the system was reassembled, we resumed measuring the air outlet temperature: it had dropped to 4.9 °C , a sign of restored thermal performance and improved energy efficiency .
Results: purified air and restored comfort
After the procedure, the client immediately noticed a marked improvement:
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The outgoing air was colder and better distributed .
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The musty smells had disappeared.
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The noise level of the unit had decreased, thanks to the removal of dust from the fan.
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The overall energy efficiency of the system has been optimized, which will help to reduce electricity consumption .
The importance of regular cleaning
A wall-mounted heat pump, like any HVAC system, inevitably accumulates dust, spores, and microorganisms over the seasons. Without regular maintenance, this leads to:
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A decrease in heating and air conditioning performance ;
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An increase in energy consumption ;
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A deterioration in indoor air quality .
At AirGreen, we recommend annual professional cleaning , ideally before the summer season, to prolong the life of the device and ensure optimal comfort throughout the year.
AirGreen's expertise at your service
Our specialized technicians use precise diagnostic tools (such as infrared thermometers and inspection cameras ) to guarantee a measurable result. Each cleaning is documented, tested, and validated on-site to provide a transparent, efficient, and sustainable service .
Whether you are in Montreal, Laval, Longueuil, on the North Shore or the South Shore , AirGreen is your trusted partner for all maintenance, cleaning or repair of residential or commercial HVAC systems .
AirGreen – Air Conditioning & Heating
RBQ certified company | Professional HVAC service in Montreal and surrounding areas
Clean air, lasting comfort, guaranteed performance.