An essential intervention to preserve the performance of an HVAC system exposed to the elements
At AirGreen , we recently completed a full cleaning of a central heat pump installed on a flat roof in the Côte-des-Neiges–Notre-Dame-de-Grâce area of Montreal . This type of installation, typical of residential and commercial buildings, presents particular challenges: constant exposure to sunlight, dust, and temperature fluctuations. These factors accelerate the fouling of essential system components.
Initial inspection: accumulated dirt and loss of efficiency
During our inspection, we quickly noticed that the outdoor unit of the heat pump was heavily soiled with atmospheric dust and roof particles .
The main findings were:
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Visible accumulation of dust and debris on the surface of the condenser and fins.
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Traces of oxidation on the upper hood, a sign of prolonged exposure to the elements.
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Dirty refrigeration wiring and ducts , requiring cleaning to prevent overheating.
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Risk of condensation drain blockage which could cause water backflow and damage to the compressor.
This situation had led to a significant decrease in system efficiency and increased energy consumption , typical symptoms of a lack of regular maintenance.
AirGreen cleaning: rigor, safety and efficiency
Our team followed a rigorous procedure adapted to a rooftop unit, where safety and precision are essential.
Step 1 – Securing and disconnecting
Before any work began, we isolated the power supply and installed the necessary safety devices. As access to the roof was limited, we used restraint straps and protective mats to prevent any damage to the waterproofing membrane.
Step 2 – Deep cleaning of the condenser
We applied a specialized biodegradable HVAC detergent to dissolve the film of dirt accumulated on the fins.
Next, a low-pressure water jet was used to remove the deposits without damaging the metal surfaces or the condenser fins.
This cleaning restored optimal air circulation , essential for the efficiency of the thermodynamic cycle.
Step 3 – Maintenance of refrigeration fittings and drain
We then cleaned the refrigeration lines using a cloth soaked in a mild solution, and then readjusted the fasteners for a better hold.
The condensation drain was checked, unblocked and treated with an environmentally friendly antibacterial product , preventing the formation of mold and bad odors.
Step 4 – Disinfection and final check
In conclusion, we disinfected the exterior surfaces using a product approved for the HVAC industry, before putting the system back on power .
Final tests confirmed improved airflow and outlet temperature in line with manufacturer's standards .
Results: restored effectiveness and a protected system
After our intervention, the heat pump was working at full capacity again.
The immediate benefits observed:
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Restoring optimal energy efficiency , reducing electricity consumption.
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Faster cooling and quieter operation.
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Prevention of costly breakdowns , thanks to drain cleaning and duct repair.
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Increased equipment durability , now better protected against wear and tear from external conditions.
Why choose AirGreen for cleaning your flat roof heat pump?
Rooftop installations require specific expertise. At AirGreen, we combine technical training, professional safety equipment, and adherence to manufacturer standards for every project.
We use only environmentally friendly cleaning products , ensuring the safety of your building and the protection of the environment.
We recommend a complete annual cleaning , particularly after dusty seasons, to keep your HVAC system in optimal condition and prevent compressor overloads.
AirGreen – Specialists in cleaning and maintaining HVAC systems in Montreal, Laval, and on the North and South Shores.
Our services ensure cleanliness, performance and peace of mind, regardless of the configuration of your installation.