Essential maintenance for performance and durability
At AirGreen , we know that regular cleaning of a wall-mounted heat pump is key to maintaining its efficiency and extending its lifespan. Recently, our team traveled to Sainte-Julie , on Montreal's South Shore , for a complete maintenance check of a Gree outdoor unit installed on a brick wall, under a wooden deck. A typical environment, but one that presents several challenges related to dirt and moisture.
Initial diagnosis: signs of fouling
The client contacted us after noticing a decrease in heating and cooling capacity , as well as unusual noise coming from the outdoor unit. At first glance, the outdoor unit showed obvious signs of dust, pollen, and grease deposits accumulated on the heat exchanger fins. Under the deck, air circulation is restricted, which promotes stagnant humidity and the buildup of micro-dirt on the grille and fan.
After a thorough visual inspection and some pressure tests, we confirmed:
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partially obstructed fins ;
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a protective grille covered in dust ;
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an irregular flow of water in the condensation drain;
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and a slight whistling sound from the fan , caused by an imbalance due to dirt.
Intervention: complete cleaning and refurbishment
1. Securing and preparing
Before any work began, we switched off the unit and protected the electrical connections. We also placed a water collection tarp under the unit to prevent any splashing onto the brick facade.
2. Partial dismantling and inspection
The side panels were removed to allow full access to the heat exchanger and fan. We inspected the aluminum fins for any corrosion or bends that could impede airflow.
3. Deep washing
The cleaning was carried out in three stages:
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Spraying of a biodegradable and non-corrosive cleaner , specially designed for HVAC systems;
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Low-pressure rinsing using a controlled water jet to remove deposits without damaging the fins;
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Wipe and dry external and internal components with antistatic microfiber wipes.
We also cleaned the condensate tray and unblocked the drain using a compressed air blower to ensure perfect drainage.
4. Fan check
The main fan was disassembled, cleaned, and rebalanced . This step eliminated the noise reported by the customer. The slightly dirty blades were restored to their original condition.
5. Disinfection and protection
Finally, we applied an antibacterial and antifungal treatment to the evaporator and grille, eliminating any risk of mold or unpleasant odors. A hydrophobic protective coating was sprayed onto the fins to limit dust adhesion in the future.
Results after cleaning
As soon as it was restarted, the improvements were immediate:
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Airflow restored to 100% , with a measured temperature difference conforming to manufacturer Gree's specifications.
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Reduced noise level , a sign that the fan was perfectly balanced.
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Fluid drainage , without accumulation of residual water.
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And above all, optimized energy efficiency , allowing the customer to save on their electricity bill.
The customer also noticed improved air quality and more consistent thermal comfort inside the house, evidence that cleaning the outdoor unit has a direct impact on the performance of the entire system.
Why entrust your cleaning to AirGreen?
HVAC cleaning is more than just a quick rinse with a hose. At AirGreen:
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We use manufacturer-approved products to prevent corrosion of sensitive surfaces;
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we comply with electrical and environmental safety standards ;
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and we provide a complete preventative service , including checking refrigerant pressure, connections and general operation.
Our certified technicians follow a rigorous protocol tailored to each type of appliance: wall-mounted heat pump, multi-zone system, or central unit . Each service call is documented and accompanied by personalized advice to maintain your equipment's performance between visits.
Preventive maintenance: a simple step, lasting benefits
An annual cleaning of the wall-mounted heat pump allows for:
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to reduce energy consumption by up to 20% ;
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to avoid costly breakdowns due to component overheating;
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to improve indoor air quality by eliminating dust and mold spores;
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and to extend the lifespan of the compressor and fan.
In Sainte-Julie, as elsewhere on the South Shore, in Laval, Longueuil, or Montreal , our teams operate with the same rigor and attention to detail. Every device, every installation, every client deserves a personalized and meticulous approach.
At AirGreen , we believe that proper HVAC maintenance is more than just cleaning: it's a guarantee of comfort, performance and peace of mind — season after season.