Winters in Montreal are as feared as they are unavoidable. Snowstorms, extreme cold, icy winds — each year, the cold season puts not only citizens but also their HVAC systems to the test. At AirGreen, we’ve noticed that many emergency calls come from failures that could have been avoided — and always at the worst time: in the middle of a freezing January night or during a blizzard on the North Shore or South Shore.
But why do these failures happen? And more importantly, how can preventive maintenance make the difference between a cozy winter and a frozen nightmare? Here’s a detailed breakdown based on our field experience across Greater Montreal.
When the Cold Intensifies, Heating Systems Are Pushed to Their Limits
In Montreal, Laval, Longueuil, and the surrounding regions, winter temperatures regularly drop below -20°C, sometimes even beyond -30°C with the wind chill. These extreme conditions:
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Force heat pumps, boilers, electric furnaces, and other HVAC appliances to run non-stop.
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Reduce energy efficiency, especially for poorly maintained or outdated systems.
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Lead to condensation, freezing, or even ice buildup on outdoor components.
Our technicians are often called out to neighborhoods like Rosemont, Saint-Laurent, Laval-des-Rapides, or even Brossard, where units fail in the middle of a cold snap. In most cases, a simple preventive maintenance could have avoided the inconvenience.
The Main Reasons Why Systems Break Down in Winter
Here are the most common causes we encounter during our winter service calls:
1. Clogged Air Filters
A dirty air filter blocks airflow, forcing the system to overheat and shut off automatically. This common issue is often overlooked.
2. Frozen Coils
When a wall-mounted or central heat pump runs continuously, moisture can freeze on the outdoor coils, blocking heat exchange. Without efficient automatic defrost or regular maintenance, this can lead to failure.
3. Faulty Fans
An outdoor fan blocked by snow or ice will prevent the unit from functioning properly. This can cause vibrations, strange noises, or a full breakdown.
4. Malfunctioning or Miscalibrated Thermostats
An inaccurate thermostat or one not properly calibrated for the system installed can cause inefficient heating cycles, or even complete system shutdown.
5. Dust Buildup Inside Components
During cleanings in areas like Saint-Léonard, Laval-Ouest, or Chambly, we often find a layer of grime on heating elements or motors, which reduces efficiency and can cause short circuits.
Preventive Maintenance: A Necessity, Not a Luxury
At AirGreen, we see HVAC maintenance as a critical investment for all homeowners and property managers across the greater metropolitan area. Annual maintenance helps:
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Prevent up to 90% of winter failures.
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Optimize energy efficiency, lowering utility bills.
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Extend the unit’s lifespan (up to 15–20 years for some heat pumps).
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Ensure consistent comfort, even during snowstorms.
Our HVAC Cleaning and Maintenance Services: What We Actually Do
Every preventive cleaning service performed by AirGreen includes:
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Thorough cleaning of air filters, coils, and drainage trays.
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Inspection of motors, capacitors, electrical contacts, and refrigerant levels.
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Thermostat calibration and cycle function analysis.
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Visual inspection of ducts and indoor components to detect wear or potential leaks.
We recently completed a full maintenance on a Gree Extreme 18,000 BTU wall-mounted heat pump in Vimont, Laval, which tended to freeze up around -15°C. After cleaning, recalibrating the thermostat, and adjusting the defrost settings, the client saw their comfort restored and energy consumption reduced by 18%.
Case Study: Avoiding a Breakdown in Longueuil
A homeowner in Vieux-Longueuil contacted us last December about a strange noise coming from their Bosch BOVA 36,000 BTU central heat pump. Our inspection revealed frost buildup that wasn't being properly defrosted and an unbalanced fan. Thanks to our intervention, we prevented a total failure during the heart of January and improved the unit’s seasonal performance.
Practical Tips to Prepare Your System for Winter
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Clean or replace your filters every 1–2 months during the cold season.
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Have your HVAC system checked by professionals before the first freeze.
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Clear outdoor units of any snow, ice, or debris.
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Schedule an annual full maintenance, ideally in the fall.
Why Choose AirGreen for Your HVAC Maintenance?
We do more than just clean: we diagnose, prevent, and optimize. Our interventions are performed by certified technicians specialized in systems from FUJITSU, GREE, SHARP, BOSCH, GOODMAN, TOSOT, and many other brands installed across Montreal, Laval, Longueuil, the North Shore and South Shore.
Our strength: a proactive, personalized approach focused on long-term system performance.
Conclusion: Prevent Instead of Endure
Don’t let a poorly maintained system ruin your winter. Whether you’re a homeowner in Lachine, a building manager in Repentigny, or a tenant in a Saint-Hubert condo, preventive maintenance is your best protection against the cold.
At AirGreen, we believe that a high-performing HVAC system starts with rigorous maintenance. Book your appointment today and enjoy peace of mind all winter long.