Cleaning a Sanyo wall-mounted heat pump in Verdun

An outdoor heat pump refurbished after showing signs of fouling

At AirGreen , we recently performed a complete cleaning of a Sanyo brand wall-mounted heat pump installed in Verdun , in a typical residential building in southwest Montreal. The unit, mounted on an exterior wall bracket, showed clear signs of wear and accumulated dirt : clogged fins, dirty insulating connections, and slight traces of oxidation on the casing.

Initial diagnosis: an interview that has become urgent

Our client had noticed a significant decrease in air conditioning efficiency , as well as increased noise from the outdoor fan . Upon inspecting the heat pump, our team identified:

• An accumulation of dust and debris between the fins of the heat exchanger;

• Residues of urban pollution stuck to metal surfaces;

• Partially deteriorated pipe insulation , exposing refrigerant lines to direct heat;

• A clogged drain , promoting moisture retention.

These problems, typical of an urban outdoor environment, directly affect energy efficiency and compressor lifespan .

AirGreen Professional Cleaning Process

Our technicians carried out a complete intervention in several stages:

1. Power cut-off and securing of the area under the metal staircase;

2. Cleaning the condenser fins using a jet of soft water under controlled pressure, combined with a biodegradable detergent specially formulated for aluminum surfaces;

3. Vacuuming of ingrained dirt using a portable compressor and a directional flow nozzle;

4. Rinse the outer casing , then apply antibacterial disinfection to eliminate any organic deposits;

5. Verification and re-insulation of refrigerant lines with heat-resistant foam;

6. Cleaning and testing of the electrical box , including tightening connections and visual inspection of grounding.

Measurable results and immediate improvement

Once the Sanyo heat pump is restarted:

• The air discharge temperature dropped by 3.5°C , evidence of optimized heat exchange;

• The noise level has decreased by almost 20% ;

• The compressor now starts smoothly;

• The client noted a better temperature consistency in his home from the first hours following the intervention.

Preventive maintenance: a profitable investment

Outdoor units exposed to urban particles , such as those installed in alleyways or under metal structures, must be cleaned at least once a year . This cleaning:

• Maintains the energy efficiency of the heat pump;

• Reduces electricity consumption;

• Prevents compressor overheating;

• Limits abnormal noises;

• Prevents refrigerant leaks due to premature corrosion.

At AirGreen , we apply safe cleaning methods that comply with manufacturers' recommendations, while respecting environmental standards .

Conclusion: a system ready for all seasons

Thanks to this thorough cleaning, the Sanyo wall-mounted heat pump in Verdun has regained its full efficiency. Our client now enjoys consistent comfort and a durable HVAC system , ready to withstand both the summer heat and the winter cold.