Complete restoration of a soiled unit under a terrace
At AirGreen , we know that a thorough HVAC cleaning can make all the difference between a noisy, inefficient unit and a quiet heat pump operating at peak performance. Recently, our team traveled to Boisbriand , on Montreal's North Shore , to perform a complete cleaning of a Friedrich Inverter wall-mounted heat pump installed under a wooden deck—an environment that, over time, had allowed for a significant accumulation of dirt.
Initial state: a unit suffocated by dust and humidity
The customer called us after noticing that their heat pump seemed less efficient in cooling mode , despite using the usual settings. Upon inspecting the outdoor unit, our technician quickly identified several signs of neglect :
-
Fins covered in dust and sticky residue ;
-
Air intake grille blackened by deposits of moisture and dirt;
-
Noisy fan due to a slight imbalance;
-
Slowed condensation drainage .
Under the terrace, air circulation is often reduced. This creates a humid microclimate where dust, pollen, and micro-debris accumulate more quickly, compromising the appliance's heat dissipation.
Cleaning process: AirGreen method
1. Securing and Diagnosis
We disconnected the unit's power supply and performed a complete inspection: wiring, refrigerant connections, wall bracket, and drain. This step ensures safe working practices and allows us to detect any early signs of corrosion.
2. Disassembly and preparation
The side panels were removed to access the heat exchanger, fan, and condensate tray . A protective film was placed on the surrounding walls to protect the masonry during cleaning.
3. Cleaning the fins and the fan
Using a biodegradable, pH-neutral cleaner , we sprayed the soiled surfaces, then rinsed them at low pressure with a jet of lukewarm water. This method removes:
-
the compacted dust between the fins;
-
greasy deposits due to pollution and humidity;
-
and the microorganisms responsible for unpleasant odors.
The axial fan was carefully disassembled, cleaned, and reinstalled. The balance was then checked using a tachometer to ensure smooth and quiet rotation.
4. Clearance of the condensation drain
The drain was partially blocked by a mixture of mud and algae. We cleared it using a compressed air blower , then rinsed it with a disinfectant solution. This prevents blockages from forming and water from stagnating, which could cause leaks.
5. Finishing and disinfection
Once the system was dry, we applied an antibacterial and antifungal treatment to the internal surfaces. This treatment acts as a protective barrier, reducing biofilm formation and improving the quality of the exhaust air. Finally, we cleaned the exterior panels and applied a hydrophobic protective coating to the heat exchanger to prolong its cleanliness.
Results: restored efficiency and quiet operation
As soon as it was restarted, the change was obvious:
-
The airflow has returned to optimal levels , improving heat exchange.
-
The noise level has dropped , proof of a perfectly balanced fan.
-
The drainage system has become fluid and leak-free again.
-
And most importantly, energy efficiency improved measurably : the unit reached the target temperature faster while consuming less.
The customer immediately noticed fresher air and more stable operation inside. Simple maintenance, but one that completely transforms the performance of an appliance.
Why choose AirGreen for your HVAC maintenance?
A superficial cleaning is not enough. At AirGreen:
-
we thoroughly clean each critical component (heat exchanger, fan, drain, panel, filter);
-
We use safe and environmentally friendly products approved by the manufacturers;
-
and we adhere to the maintenance procedures recommended by brands such as Friedrich, Daikin, Mitsubishi, and others.
Our technicians are trained to work in all configurations , including installations under terraces, in basements or on brick walls — environments often overlooked but essential to inspect.
Preventive maintenance: a winning reflex
Having your heat pump cleaned at least once a year, ideally before the warm season, means:
-
reduce electricity consumption by 15 to 25% ;
-
avoid compressor overheating ;
-
preserve indoor air quality ;
-
and extend the lifespan of the HVAC system .
At AirGreen, we operate throughout the North Shore, the South Shore, Montreal and Laval , with one goal: to ensure your system works like it did on day one, summer and winter.
AirGreen: professional HVAC maintenance that brings your equipment back to life.