Avoiding an air conditioning breakdown during a heatwave is no coincidence—it’s often the result of regular HVAC maintenance, a swift diagnosis, and above all, professional intervention. At AirGreen, our daily routine is filled with emergencies, unexpected issues, and sometimes, movie-worthy moments where everything could have gone wrong... but didn’t. Here are three true stories, experienced by our team in Montreal, that highlight the importance of choosing the right partner for your commercial air conditioning needs.
An office tower in downtown Montreal saved just in time
The context: a sweltering Monday morning in the heart of the business district
A building manager called us in a panic: the central air conditioning system of a ten-story building on René-Lévesque Boulevard had stopped working over the weekend. Nearly 200 employees were expected back for a normal work week, and the indoor temperature had already reached 29°C by 7:30 a.m.
AirGreen’s diagnosis
Upon arrival, our experienced technician identified abnormal energy consumption from the 25-ton Carrier rooftop unit. A thorough inspection revealed a worn-out main compressor, combined with a completely clogged condenser full of dust and debris.
The intervention
We performed a complete cleaning of the rooftop unit, replaced the compressor with an emergency part from our regional stock, and then carried out a full check of the ductwork and digital thermostats.
In under 4 hours, the commercial air conditioning system was fully operational again, restoring comfort and productivity for the entire building.
AirGreen tip: A yearly preventive maintenance, ideally in May, would have completely avoided this critical situation.
A downtown Montreal server room in jeopardy
The client call: “There’s a weird noise, and the temperature’s rising”
This case involved a digital agency with sensitive servers kept in a climate-controlled room, maintained by a high-efficiency Fujitsu Airstage wall-mounted system. On a Friday evening, the tech manager noticed an unusual noise from the indoor unit and dangerously rising temperatures in the server room.
A nearly invisible failure
Our technicians arrived at 8 p.m. The verdict: the wall unit’s control board was failing, creating an incomplete startup loop. This issue wouldn’t have triggered a fault code immediately, but could have destroyed multiple critical hard drives over the weekend.
Our solution
Thanks to our Fujitsu-compatible parts in stock at our Longueuil warehouse, we were able to replace the motherboard on-site, recalibrate the system, and restart the unit at optimal performance.
Result: the client avoided several thousands of dollars in potential losses.
A medical clinic in Rosemont and a mysterious odor issue
Symptom: “The air smells bad, our patients are complaining”
At a busy neighborhood clinic in Rosemont, the medical staff contacted us after receiving multiple complaints about a foul odor coming from the ventilation ducts. The clinic used a central Goodman R-410A heat pump for both heating and air conditioning.
Our analysis and discovery
At first glance, the system seemed to be working fine. But our team discovered that the condensate drain was partially blocked, causing water to stagnate in the drain pan, which promoted bacterial growth.
Resolution and key takeaways
We:
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Cleaned and disinfected the condensate pan,
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Slightly adjusted the drain pipe angle to prevent future stagnation,
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Installed an overflow sensor connected to a remote alert system.
Since then, the air quality has been restored, and the clinic has signed up for an annual preventive maintenance plan with AirGreen.
Why these stories matter
These aren’t just stories—they’re real-life examples of how a reliable HVAC company in Montreal, like AirGreen, plays a critical role in ensuring comfort, safety, and business continuity for commercial operations.
What we do differently at AirGreen
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24/7 availability for HVAC emergencies in Montreal, Laval, Longueuil, the North Shore, and the South Shore.
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Certified technicians trained on all major brands: Daikin, Fujitsu, Gree, Carrier, Goodman, Mitsubishi.
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Local warehouse stocked with essential replacement parts for fast intervention.
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Tailored HVAC maintenance, with digital service history, maintenance alerts, and breakdown forecasting.
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Energy performance audits offered for commercial clients.
Key lessons for any building manager
1. A strange smell or subtle noise can be the sign of a major issue.
2. Lack of preventive maintenance causes 75% of avoidable breakdowns, according to our internal data.
3. A good HVAC contractor doesn’t just react—they anticipate.
Trust AirGreen for your commercial air conditioning needs
At AirGreen, we’re more than a service provider: we become your trusted partner for all your commercial air conditioning and heat pump needs across Greater Montreal. With our real-world experience, advanced diagnostic tools, and proactive approach, we help you avoid disasters… before they happen.