An AirGreen intervention to restore the comfort of a mezzanine staircase
At AirGreen , we were recently called to Saint-Lambert , on the South Shore of Montreal , for a repair on a Midea ceiling system installed in a stairwell of a modern duplex. The customer had noticed intermittent water flow coming from the lower panel of the unit as well as a noticeable drop in performance in air conditioning mode .
This type of installation—a Midea ceiling/floor unit built into the ceiling—offers excellent performance for open areas or areas with high ceilings. However, its restricted access can complicate maintenance, and in this case, a lack of seasonal maintenance had contributed to dust accumulation on the filters and condensate drain.
Diagnosis: A classic double problem
Upon our arrival, our technicians carried out a complete inspection of the drainage circuit and the blower module. Several anomalies were noted:
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Condensate leak due to a slight obstruction in the drain pipe.
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Saturated air filters , reducing airflow and causing excessive condensation on the evaporator.
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Control card slightly oxidized , a consequence of accumulated humidity.
We immediately unplugged the system , removed the access panels, and meticulously cleaned the internal area using an HVAC-approved antibacterial product , ensuring a healthy, mold-free environment.
Ceiling system repair and refurbishment
The intervention took place in several precise stages:
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Complete cleaning of the condensate tray and restoration of drainage using a vacuum pump.
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Partial replacement of the drain pipe to prevent any recurrence.
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Cleaning and disinfection of filters with a non-corrosive biocide treatment.
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Electrical overhaul : inspection of connections and replacement of the main relay, slightly affected by corrosion.
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Complete test of air conditioning and heating modes , including verification of air flow and blowing temperature.
After these adjustments, the Midea unit regained its full cooling capacity . The ambient temperature of the mezzanine, which had previously stagnated at 26°C despite the “cool” mode, was brought down to 22°C in less than 20 minutes .
Results and preventive maintenance tips
The customer immediately noticed the disappearance of leaks and a more even airflow in the stairwell.
We recommended to him:
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Annual preventative maintenance before summer, including cleaning the filters and checking the drain.
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A refrigerant level check every two years.
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The possible installation of a condensate overflow sensor , a simple but effective measure to prevent future incidents.
AirGreen Expertise in Saint-Lambert and on the South Shore
Midea ceiling/floor units require specific expertise to be properly maintained, especially in residential environments where access is restricted. Thanks to our RBQ-certified team, trained on Midea, Fujitsu, Sharp and Gree systems , we respond quickly throughout the South Shore , but also in Montreal, Laval, Longueuil, and the North Shore .
Each AirGreen repair aims to maximize the lifespan of your HVAC equipment , while ensuring energy efficiency and optimal comfort .
Why choose AirGreen?
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Professional and transparent service, with no hidden costs.
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Complete diagnosis before any repair.
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Warranty on replaced parts and labor.
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Rapid interventions, even in areas with complex access.
Your comfort, our mission
A minor condensate leak may seem trivial, but it can quickly lead to damage to the wall or ceiling and reduce the overall performance of the system . At AirGreen, we ensure that every unit—whether wall-mounted, centrally located, or ceiling-mounted—operates at peak efficiency, summer and winter.
AirGreen — Your HVAC partner in Saint-Lambert, Montreal and throughout the South Shore.