An outdoor unit blocked by snow: essential cleaning to prevent overheating
At AirGreen , we regularly work on the North Shore , where harsh winters put HVAC systems to the test. This service call in Boisbriand involved a Goodman central heat pump whose outdoor unit was partially buried under snow.
Initial diagnosis: a performance in freefall
The customer reported a loss of heating efficiency and unusual noise coming from the outdoor unit. Upon arrival, we found that the front grille and fan were covered in compacted snow , blocking airflow.
This type of situation prevents the system from exchanging heat properly, which can cause:
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An increase in electricity consumption ;
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Compressor overheating ;
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Overly frequent defrosting cycles reduce the machine's lifespan.
Cleaning preparation
Before any work was carried out, we disconnected the system's power supply to ensure complete safety. The intervention was scheduled for daytime to take advantage of more favorable temperatures and good visibility around the unit.
We delimited the work area, cleared the immediate perimeter and manually removed the accumulated snow on and around the device — a crucial step before the thorough cleaning.
Steps for a complete cleaning
1. De-icing and clearing of the structure
Using a low-temperature hot air blower , we removed the thin layers of ice from the grille without damaging the aluminum fins. The goal: to restore ventilation without risking bending the fins.
2. Cleaning the condenser fins
Once the surface was dry, we used a specialized, biodegradable, and non-corrosive cleaner for outdoor condensers . This product dissolves the salt deposits, dust, and oils that accumulate throughout the year.
Using a soft brush and a low-pressure rinse , the fins regained their original shine and optimal thermal conductivity.
3. Check the fan and connections
The fan was cleaned and lubricated as needed. We inspected the electrical connections and compressor wiring for any signs of moisture or oxidation. Slight condensation had begun to seep into the casing, but this was quickly remedied.
4. Reopening and testing the system
After complete drying, the unit was powered back on. Airflow returned to normal and the heat pump resumed quiet and stable operation. The recorded pressures and temperatures confirmed optimal performance .
Results and recommendations
The cleaning restored:
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The maximum airflow through the condenser;
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Energy performance in line with manufacturer's specifications;
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Quiet and stable operation , even in negative temperatures.
We recommended that the customer install a superior snow guard , designed to prevent direct accumulation on top of the compressor — while leaving side ventilation clear.
Furthermore, preventative cleaning in the spring is essential for:
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Remove debris accumulated after the snow melts;
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Check the condition of the fins before the air conditioning season;
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Preventing premature corrosion of the condenser.
Why choose AirGreen for the winter maintenance of your heat pump?
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We are aware of the extreme conditions of the Quebec climate and adapt our cleaning methods accordingly.
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Our certified technicians use safe products and tools, in accordance with Goodman and other major brand recommendations.
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Our interventions are rapid, preventative and always aim to optimize the lifespan of your system.
In winter, proper maintenance guarantees constant, quiet and economical heating — even under snow.