An essential intervention to breathe new life into a clogged device.
At AirGreen , we were recently called in for a complete cleaning of a wall-mounted air conditioner installed on a red brick wall in a typical duplex in Montreal's Rosemont–La Petite-Patrie neighbourhood. The unit, although still functional, showed several signs of accumulated neglect : fins clogged with dust, saturated filters, and dirt deposits on the outdoor condenser.
Initial observation: a device lacking power
Upon our arrival, the client informed us that the air conditioner was no longer cooling effectively and that the airflow had significantly decreased . Upon closer inspection of the outdoor unit, mounted high on a wall bracket, we observed:
-
A significant accumulation of dust and dirt on the fan grille.
-
Traces of moisture and light mold around the case.
-
Exposed cables requiring a safety inspection.
-
A cluttered environment limiting airflow — wooden planks and debris had accumulated nearby, contributing to the problem.
Inside, the filters of the wall module had a thick layer of grey dust , evidence of maintenance not being carried out for several seasons.
Step-by-step cleaning process
1. Securing and preparing the workstation
We began by unplugging the unit and clearing the area around the outdoor unit to ensure a safe working environment. All ventilation grilles were protected to prevent any water from seeping into the wall.
2. Cleaning the external condenser
Using our low-pressure washing station , we applied a biodegradable cleaner specifically designed for the metal surfaces of condensers.
This product effectively dissolves grease, dust and microorganisms without damaging the fins.
A thorough rinse with clean water then restored the full efficiency of the heat exchange.
3. Disassembly and washing of the interior module
We removed the air filters, washed them in warm water with mild soap, then left them to air dry.
The evaporator and fan were treated with an antibacterial solution to eliminate mold spores and prevent their reappearance.
We also cleaned the drainage tray and unblocked the condensate drain pipe , which is often responsible for water leaks in this type of installation.
4. Complete verification and return to service
Before restoring power to the system, we checked:
-
The integrity of the electrical cables and the wall bracket.
-
The fan is functioning correctly.
-
The absence of vibration or abnormal noise upon restarting.
Results: restored efficiency and purified air
After our intervention, the client immediately noticed:
-
Significantly improved airflow .
-
A rapid drop in indoor temperature .
-
A smell of fresh air , without any trace of stagnant moisture.
This cleaning also reduced the unit's energy consumption , which is often overworked when dirty. By restoring the system's performance, we helped extend the air conditioner's lifespan and improve indoor air quality .
AirGreen's expertise: rigor and adherence to best practices
At AirGreen, every HVAC system cleaning is performed meticulously, in accordance with manufacturer recommendations . Our technicians use environmentally friendly products and specialized tools to ensure safe and long-lasting maintenance.
We also emphasize the importance of carrying out a complete cleaning at least once a year , particularly before the summer season.
Regular preventative maintenance ensures:
-
Improved energy efficiency .
-
Cleaner air throughout the house.
-
Effective prevention against costly breakdowns .
In summary
This wall-mounted air conditioner cleaning in Rosemont–La Petite-Patrie demonstrates how simple maintenance can transform indoor comfort and extend the life of your unit.
At AirGreen, we operate in Montreal, Laval, on the North Shore and the South Shore to offer each client a complete, professional and eco-responsible HVAC cleaning service.