A complete intervention in the rain for restored efficiency
At AirGreen , we recently performed a complete cleaning of a Gree wall-mounted heat pump installed on the exterior wall of a house in Sainte-Julie , on Montreal's South Shore. The unit, partially protected by a roof overhang, had a significant accumulation of dust, pollen, and urban debris. Despite appearing clean from a distance, closer inspection revealed extensive fouling of the fins and housing.
This type of deposit, common in spring, significantly reduces energy efficiency and can cause increased consumption or unusual noises during operation.
Diagnosis before cleaning
Before beginning the wash, our technicians carried out a complete visual inspection :
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The condenser fins were partially obstructed by dust and pollen.
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The fan showed a thin layer of accumulated dirt.
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Stagnant moisture around the bottom of the unit suggested a slight blockage in the drain.
These signs, although subtle, are enough to impair the system's performance and increase the compressor's workload . The customer had also noticed that the heat pump seemed to be working harder on hot days.
The AirGreen washing process
1. Preparation and securing
The team first disconnected the power supply and protected the refrigeration connections and wiring with waterproof covers. We also cleared the area around the unit to facilitate flushing, while preserving the adjacent brick wall.
2. Application of the biodegradable cleaner
An environmentally friendly, non-corrosive cleaning product approved for HVAC systems was applied evenly over the entire surface of the condenser.
This active foam dissolves grease and fine particles without damaging the aluminum. The product was left in contact for a few minutes to maximize its cleaning effect.
3. Low-pressure rinsing
In light rain, our technicians carried out a gentle rinse with clean water , following the direction of the airflow to avoid any infiltration.
The thorough rinsing completely removed the foam and dissolved impurities, restoring the Gree unit to its original shine.
4. Cleaning of technical areas
The connection areas and the lower part of the housing were carefully wiped and inspected. We checked:
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The integrity of the condensation drain ;
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Securing the power cable ;
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The absence of corrosion around the screws and supports.
A start-up test then confirmed that the fan ran quietly and that the air outlet temperature met factory specifications.
Results observed after intervention
Once the wash was finished, the difference was clear:
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Improved airflow and immediate drop in outlet temperature.
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Reduction in ventilation noise , proof of restored air balance.
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Restoring energy efficiency means savings on the electricity bill.
The customer was able to notice, from the first few hours, a faster cooling and better stability of the indoor temperature .
Why washing the exterior of a heat pump is essential
Outdoor units like this Gree wall-mounted unit in Sainte-Julie are constantly exposed to pollen, insects, dust, and acid rain. No annual maintenance required.
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The air circulation is poor, the compressor overheats.
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Energy consumption increases by 10 to 25%.
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The system's lifespan decreases significantly.
AirGreen professional cleaning guarantees the performance and longevity of your appliance while protecting your initial investment. Furthermore, our products are environmentally friendly, an essential aspect for our eco-conscious customers.
AirGreen's expertise: method, rigor and respect for the manufacturer
Each cleaning we perform is tailored to the brand and installation context . For Gree units, our technicians follow the manufacturer's recommended procedures , including:
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The water pressure limit is less than 100 psi.
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The exclusive use of pH-neutral detergents.
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Systematic checking of refrigeration connections after washing.
Thanks to our rigorous approach and experience in residential and commercial HVAC systems , AirGreen remains a benchmark in the maintenance of wall-mounted heat pumps across Montreal, Laval, the North Shore and the South Shore .