In a condo in Ville-Marie , a client contacted us because their Gree wall-mounted heat pump was no longer performing as expected. In cooling mode, the problem was simple: the air coming out was too lukewarm , the room took a long time to stabilize, and the unit seemed to be "working hard" without delivering the expected comfort.
The photo taken during our visit shows the Gree wall-mounted indoor unit installed high up (a classic residential mini-split configuration), and an infrared thermometer reading of approximately 15.8°C at the air outlet—a useful indicator, but not sufficient on its own to confirm proper operation (ambient conditions and the unit's settings greatly influence the reading). This is precisely why our approach relies on a comprehensive diagnosis , not just a single value.
System type and intervention context
This is a Gree brand wall-mounted heat pump (mini-split/wall unit) . Since the exact model isn't visible in the photo, we're deliberately being realistic: a Gree residential wall-mounted unit (recent generation), very common in Montreal condos for its compact size and summer/winter comfort.
The installation observed is typical:
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wall unit well centered, adequate clearance around the hood;
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adjustable air outlet flap;
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configuration designed to efficiently treat a living area (living room/kitchen).
Reported symptoms: what the client experienced on a daily basis
Before our arrival, the client described us as follows:
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cooling slower than before;
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impression of less cold air when blowing;
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longer cycles, device that operates for a long time without "catching up" with the temperature;
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Uneven comfort (some areas remain warm).
In an environment like Ville-Marie (glass condos, significant solar gains, variable occupancy), a drop in performance is noticed very quickly.
AirGreen diagnosis: field method, step by step
Our technician proceeded as we systematically do at AirGreen, with a simple logic: validate the overall behavior , then isolate the cause.
1) Verification of settings and operating conditions
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mode (Cool / Dry / Auto), set temperature, fan speed;
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position of the shutters;
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quick check of errors and indicators.
A bad setting can mimic a breakdown… but here, the settings were consistent: we were definitely requesting air conditioning.
2) Checking airflow and filter condition
On wall-mounted units, a clogged filter or a dust-laden evaporator can reduce performance:
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the flow rate decreases;
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Heat exchange is less efficient;
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The blown air becomes less "biting".
We therefore inspected and cleaned what needed to be cleaned, then restarted the device to observe the evolution.
3) Temperature measurements and cooling consistency
The reading of around 15.8 °C at the blower (seen in the photo) served as our starting point, but we mainly checked:
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the difference between recirculated air and blown air;
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the stability of the blowing temperature over time;
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the behavior of the fan (acceleration, noise, variation).
4) Check drainage and moisture levels
A partially blocked drain can lead to:
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odors;
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decrease in efficiency;
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sometimes even stoppages, frost or overflows.
We have validated the flow and general condition of the tank/line, especially important in condos where water damage is a major risk.
5) Checking refrigeration parameters (if necessary)
When the initial points are insufficient to explain the performance drop, we proceed with checks related to the circuit:
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indirect signs of a lack of charge;
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abnormal behavior (frosting, performance that collapses after a few minutes, etc.);
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visual inspection of accessible fittings.
Repair completed: Gree wall light restored to normal performance
In this type of case in Montreal, the most frequent and effective solution combines:
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restoration of airflow (targeted cleaning, filters, exchange area);
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validation of drainage (prevention of odours and performance losses);
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recalibration of use (optimized settings according to the area and thermal load of the condo).
After intervention, the unit regained stable operation: more constant airflow, a clear feeling of cold, and above all, the ability to bring the room back to the desired temperature without endless cycles.
Result: comfort restored, confidence regained
The most important gain is not just a value on the thermometer: it is the return to real, measurable and lasting comfort.
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More uniform temperature in the living area.
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Reduced cooling time.
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Less "forced" operation.
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The client was reassured, with clear recommendations to prevent the problem from recurring.
Our advice to avoid a further drop in performance (Gree wall light)
In a condo in Ville-Marie, with urban dust, an open kitchen, and sometimes heavy air conditioning, we recommend:
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Clean the filters every 4 to 6 weeks during periods of intensive use;
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keep the flap and air intake clear;
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plan a complete periodic maintenance (especially if the device is also used for heating);
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Act quickly as soon as the air seems less cold: the longer you wait, the more the device works unnecessarily.
Why entrust your repair to AirGreen in Montreal?
At AirGreen, our strength in wall-mounted heat pumps (including Gree ) is simple:
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rigorous diagnosis, oriented towards "real cause";
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Clean repair, adapted to the condo context (access, noise, drainage, damage prevention);
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Clear communication: what has been checked, what has been corrected, and what to monitor next.