Choosing the right time to repair your wall-mounted air conditioner can make all the difference between a quick fix and unexpected costs from a major breakdown. At AirGreen, we understand how essential a reliable cooling system is—especially during Montréal’s sweltering summer months, whether you’re in Montréal, Laval, Longueuil, the North Shore or the South Shore. That’s why today, we’re sharing the 5 most critical warning signs that your air conditioner needs immediate repair.
Real Expertise from the Field
Every day, our technicians service dozens of homes and commercial buildings throughout Greater Montréal to diagnose and repair HVAC systems (heating, ventilation and air conditioning). These service calls allow us to detect recurring symptoms of a system in distress—often ignored until it’s too late.
Unusual Noises: Squeaking, Clicking or Whistling
One of the first signs of a failing wall-mounted air conditioner is the presence of strange noises. A metallic squeal can indicate a motor issue, a clicking sound may point to loose components, while a high-pitched whistle often suggests a refrigerant leak.
Real Example from the Field:
In Saint-Hubert, on the South Shore, we were recently called to inspect a Gree Lomo 18,000 BTU unit emitting a constant whistle. Upon inspection, we identified a leak in the refrigerant circuit caused by a weakened joint. Immediate repair prevented the client from losing all of their R-410A gas—a cost that could have easily doubled the bill.
Sudden Drop in Cooling Performance
Your unit seems to be running, but the room stays hot? This is a frequent symptom of a failing compressor or a problem with the thermostat or internal sensors.
Real Case:
In a home in Laval, a Fujitsu KZAH R-32 wall-mounted heat pump (12,000 BTU) wasn’t blowing cold air, even though it appeared to be functioning. Our technicians discovered a poorly calibrated temperature sensor, causing the cooling cycles to end prematurely. A simple reprogramming and recalibration restored the family’s comfort.
Unexplained Spike in Your Electricity Bill
An inefficient HVAC system consumes more energy for less output. If you’ve noticed a sudden and persistent rise in your electricity bill without any change in usage habits, your wall-mounted air conditioner could be the culprit.
Real Testimonial:
A client from the North Shore, in Blainville, contacted us after noticing a 30% increase in electricity consumption in July. Our analysis of their Tosot wall-mounted heat pump revealed a clogged outdoor fan and an obstructed condenser. A thorough cleaning restored optimal energy performance and brought the costs back down to normal.
Water Leaking or Pooling Around the Indoor Unit
Your indoor unit should never leak. If water is dripping down your wall or pooling on the floor, it could indicate a clogged drain line, a cracked condensate pan, or worse—a serious overheating issue.
Installation in Longueuil:
During an emergency call, we found a Sharp ZU1 24,000 BTU unit installed in a condo that was leaking heavily. The drainage pipe had been poorly angled by the initial installer. Correcting the slope, thoroughly cleaning the pan, and installing an insulated pipe resolved the issue immediately.
Foul Odors Coming from the Unit
If your wall-mounted air conditioner is releasing a musty smell, a burning odor, or a plastic-like scent, it could mean mold inside the evaporator, electrical overheating, or even a pending short circuit.
Intervention in Montréal:
In a triplex in Rosemont, we received a call about a persistent burning smell. Upon examining a Lennox wall-mounted heat pump, we discovered a failing capacitor on the verge of burning out. We replaced the component urgently, avoiding a potential fire risk.
Why Immediate Action Is So Important
Every day you wait can make the problem worse. What starts as a simple noise can escalate into a full compressor failure, resulting in costly replacement fees. Our certified technicians in Montréal, Laval, Longueuil, and across the North Shore and South Shore, are fully equipped to diagnose and repair quickly, often in a single visit.
Our Practical Tips to Extend Your AC’s Lifespan
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Have your system serviced annually, ideally in the spring.
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Clean the filters every 2 to 4 weeks during peak season.
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Never block air vents with furniture or curtains.
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Report any unusual behavior (noise, smell, low performance).
Trust AirGreen for Fast, Reliable, and Transparent Repair Services
At AirGreen, we don’t just fix problems: we optimize, explain, and anticipate. Our interventions are thoroughly documented, guaranteed, and carried out by a team driven by quality, performance, and customer satisfaction.
Whether it’s a simple cleaning or a complete emergency repair of a wall-mounted heat pump in the middle of summer, we have the tools and the know-how to restore your comfort quickly and reliably.
Think your air conditioner is showing one of these signs? Don’t let the issue worsen. Reach out to our team now for a complete evaluation or emergency service anywhere in Montréal, Laval, Longueuil, North Shore or South Shore.