Professional maintenance at height to breathe new life into a Fujitsu heat pump
On the flat roofs of Lachine, it's not uncommon to find Fujitsu wall-mounted heat pump outdoor units exposed to rain, wind, and urban dust. These conditions accelerate the accumulation of debris, pollen, and mineral deposits, especially after a wet spring. At AirGreen , we received a call from a client concerned about a drop in their heat pump's performance and an unusual noise coming from the outdoor unit.
After a thorough inspection, our team found a significant layer of dust and dirt stuck to the evaporator fins , as well as a light foam buildup on the top of the casing. These classic signs indicated that a deep cleaning was necessary to restore energy efficiency and prevent compressor overheating.
Initial diagnosis: dirt buildup and loss of efficiency
The unit, installed on a flat gravel roof, was subject to the combined effects:
-
constant dust carried by the wind ,
-
leaves and plant particles from the surrounding trees,
-
and the stagnant moisture typical of flat roofs.
These conditions promote premature corrosion of the fins and fouling of the air ducts , two common causes of inefficiency in outdoor HVAC systems. The client also noted that the heat pump was struggling to maintain the desired temperature, while consuming more electricity than usual.
AirGreen cleaning steps: precision and respect for the equipment
1. Securing and cutting off the power
Before any work began, our certified technician disconnected the power and isolated the circuits to ensure a safe intervention. The cables and connections were protected with waterproof caps.
2. Low-pressure pre-cleaning
Using a gentle, controlled pressure jet , we performed a preliminary rinse to dislodge surface dust without damaging the aluminum fins. This first step allows us to assess the amount of dirt and adjust the pressure accordingly.
3. Application of an environmentally friendly, biodegradable cleaner
At AirGreen, we prioritize environmentally friendly cleaning solutions , free of corrosive solvents. The product is sprayed evenly onto the coils and housing to dissolve grease deposits and atmospheric residues . It works for a few minutes before the final rinse.
4. Thorough rinsing and visual inspection
The final rinse is carried out with clean water until all traces of foam and dirt have disappeared. Our technician then inspected the fins, electrical connections, and fan , verifying that everything operated freely and without vibration.
5. Check drainage and airflow
Finally, a complete condensate drainage test was carried out to ensure that no obstructions could lead to water leaks or long-term corrosion.
Result: restored efficiency and guaranteed durability
As soon as it was restarted, the Fujitsu heat pump resumed smooth, quiet, and stable operation. The customer noticed an immediate difference in airflow and the freshness of the indoor air . Thanks to AirGreen's professional cleaning:
-
Energy efficiency has been optimized.
-
The internal components have been preserved.
-
and the system's lifespan is thereby extended.
This type of preventative maintenance significantly reduces the risk of costly breakdowns and maintains optimal performance of HVAC systems, especially before the summer heat waves.
The importance of annual maintenance on flat roofs
Flat roof installations require special attention. Direct exposure to weather, pollution, and urban debris increases the risk of fouling. A complete annual maintenance program —including cleaning the coils, fan, and casing—ensures:
-
optimal airflow ,
-
reduced energy consumption ,
-
and superior air quality inside the building.
At AirGreen, our trained technicians serve all of Montreal, Laval, Longueuil, the North Shore and the South Shore , adhering to the recommendations of manufacturers such as Fujitsu , Mitsubishi , Gree and Daikin . We use specialized tools and environmentally friendly products to ensure thorough cleaning without risk to electronic components.
An approach that's AirGreen's signature: expertise, rigor and respect
Every cleaning we perform is based on a precise methodology, combining safety, efficiency, and adherence to manufacturer standards . Our clients appreciate our comprehensive approach.
-
inspection before and after cleaning
-
Photo documentation available upon request.
-
tips for preventing future fouling.
Thanks to our experience in the residential and commercial HVAC field, we know that proper maintenance translates directly into lasting comfort and tangible energy savings.
AirGreen – Experts in cleaning and maintenance of HVAC systems in Montreal, Laval, Longueuil, on the North Shore and the South Shore.
Pure air, maximum performance, and peace of mind – the AirGreen signature.