A critical snow-covered repair to restore comfort in the middle of winter
At AirGreen, every service call is an opportunity to showcase our expertise, responsiveness, and commitment to our clients’ comfort. In this story, we’re sharing a recent intervention in the La Petite-Patrie neighborhood of Montréal, where our team was called in for an emergency repair on a Mitsubishi wall-mounted heat pump in the middle of a particularly harsh winter episode.
Context of the call: a Mitsubishi heat pump losing efficiency
The client, a resident in the residential area of La Petite-Patrie, reached out after noticing a drastic drop in the performance of their Mitsubishi Electric Zuba High Efficiency (Hi) wall-mounted heat pump. The outdoor unit was accumulating snow, and the heat produced was no longer sufficient to keep the house at a comfortable temperature.
This unit, a Mitsubishi Zuba Central Hi system, is designed to deliver optimal performance even at very low temperatures thanks to its Hyper Heating technology. However, when a high-performance system starts to show signs of struggling, it requires immediate professional inspection.
Initial inspection and technical diagnosis
Upon arrival, we found that the outdoor unit was partially obstructed by a buildup of snow and that the compressor output was inconsistent. With our dual digital manifold, we were able to quickly check the refrigerant pressure and identified a low refrigerant charge.
Visual inspection and accurate measurements confirmed a small leak, likely located on a refrigerant line exposed to freezing conditions. Additionally, the unit hadn’t undergone preventive maintenance before the winter season, which may have contributed to the frost accumulation.
Repair steps carried out by our AirGreen technicians
Our experts followed these steps:
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Manual and safe defrosting of the outdoor unit to allow for a full inspection without damaging internal components.
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Leak detection using nitrogen pressure testing to accurately pinpoint the refrigerant leak on the low-pressure line.
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Repair of the damaged section, followed by a full system vacuum to remove internal moisture.
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Complete recharge with R-410A refrigerant, with careful pressure monitoring using our digital manifold.
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Verification of proper heat pump operation over several heating cycles.
The particular challenges of Montréal’s winter climate
Working on outdoor HVAC equipment during Montréal’s winter conditions, especially in dense neighborhoods like La Petite-Patrie, demands rigorous technical know-how. Exposure to the elements, accumulated snow, and extreme temperatures can complicate diagnostics or repairs if not handled by seasoned technicians.
At AirGreen, we’re fully equipped to respond effectively even at -20°C, without compromising safety or system performance.
Final result: optimal heat pump performance, reassured customer
After our intervention, the heat pump regained its full capacity, providing stable, consistent heating throughout the home. The customer noticed an immediate improvement in room temperature and reduced noise from the unit.
We also offered the client an annual maintenance program to help prevent potential malfunctions before each winter season.
AirGreen expertise at your service across Montréal
At AirGreen, our mission isn’t just to repair HVAC equipment. We always take a comprehensive approach: precise diagnostics, long-lasting solutions, and personalized advice to improve energy efficiency and system longevity.
Whether you're in La Petite-Patrie, Villeray, Rosemont, or elsewhere on the Island of Montréal, our certified technicians are ready to respond quickly—even on the coldest days of the year.
Why choose AirGreen for your wall-mounted heat pump repairs?
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24/7 emergency response during winter
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Technicians trained on premium brands like Mitsubishi, Fujitsu, Gree
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Servicing all system types: Zuba Central, multi-zone, single-zone wall-mounted
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High-precision digital diagnostic tools
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Guaranteed repairs and workmanship
Recommendations to avoid winter HVAC breakdowns
Here are some best practices we recommend for our clients across Montréal, Laval, Longueuil, and the North Shore:
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Schedule a heat pump check-up in the fall
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Regularly clear snow around the outdoor unit
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Book annual preventive maintenance with a professional
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Avoid covering the unit with non-breathable covers
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Watch for unusual noises or drops in performance
Our conclusion
This service call in La Petite-Patrie perfectly illustrates the importance of working with an experienced team for any Mitsubishi wall-mounted heat pump repair. At AirGreen, we combine cutting-edge technology, deep HVAC system knowledge, and a steadfast commitment to excellent service across all neighborhoods of Montréal.
Noticing performance issues, strange noises, or excessive frost on your outdoor unit? Contact us today. We’re ready to restore your comfort—even in the snow.