When you want quiet , discreet comfort that's perfectly distributed from room to room, ducted air conditioning quickly becomes the cleanest option for residential homes. Recently, our AirGreen team installed a Gree ducted system in Rosemont–La Petite-Patrie , with an outdoor unit mounted on a flat roof —a very common situation in Montreal, but one that demands flawless execution.
The photo clearly shows the Gree outdoor unit, installed on a raised structure (aluminum support) resting on beams to distribute the load and protect the roof membrane. The connections (refrigerant piping and cables) are neatly and safely routed, with an exit/pathway adapted to a technical roof (presence of vents, outlets, and existing mechanical components).
Why choose a ducted air conditioner in Montreal?
In many plexes and flat-roofed buildings in the Rosemont area, clients are looking for two things:
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Avoid having a visible wall-mounted headboard in the living room or bedrooms
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Gain in uniformity (less temperature variation between rooms)
The ducted system perfectly meets these objectives: the indoor unit (hidden in a ceiling, soffit, or technical space) distributes air via discreet ducts and grilles. The result: consistent comfort, preserved aesthetics, and a central feeling without necessarily renovating the entire house.
Type of machine installed
This is a Gree ducted indoor system (category: Indoor Systems – Ducted ), with an Inverter outdoor unit.
The exact model is not legible in the photo, but the installation is typical of a Gree Ducted Residential sized for a Montreal home (often around 18,000 to 24,000 BTU , depending on insulation, area, sunlight and airtightness).
At AirGreen, the selection is always based on real data (loads, habits, zones, duct constraints), in order to avoid the classic trap: oversizing (short cycles, discomfort, poorly managed humidity) or undersizing (too frequent electric backup in winter).
What flat roof installation really changes
Installing an outdoor unit on a roof in Montreal isn't a simple matter of "dropping it off and leaving." It requires planning ahead:
1) Membrane protection
Here we see a clean approach: planks + raised structure .
The objective is threefold:
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distribute the load,
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avoid direct pressure points,
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limit the risk of premature wear of the membrane.
2) Vibrations and noise
A ducted unit is chosen for its discretion — therefore the exterior must follow the same logic.
The raised structure allows for the integration of anti-vibration pads and maintains adequate clearances. On a plexiglass structure, this is crucial to prevent vibrations from being transmitted to the building structure and becoming noticeable in certain rooms.
3) Snow, ice and drainage
In winter, the roof changes: accumulation, thaw, refreezing. Raising the unit helps to:
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Keep equipment above areas of snow/ice.
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reduce the risk of obstruction,
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maintain adequate air intake.
4) The path of the connections
In the photo, the transition is clear: grouped connections, controlled route. On the roof, we want to avoid:
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the “floating” connections that move in the wind,
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angles that are too tight (bad for longevity),
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the friction points on the membrane.
The concrete advantages of a Gree Ducted Air Conditioner for a home in Rosemont
Consistent comfort, room by room
Ducted systems allow for more even air distribution. In a typical home (open plan + bedrooms), the airflow can be balanced thanks to intelligent duct design: good sizing , good dampers, good grilles.
Impeccable aesthetics
No dominant wall-mounted unit: air is vented through discreet grilles. This is highly valued in renovations where interior design is a priority (wood paneling, accent walls, custom storage).
Silence in everyday life
With the inner unit hidden and the outer unit installed with an anti-vibration approach, the whole thing becomes particularly comfortable — especially at night.
Quebec winter performance
When properly sized and installed, the Gree ducted system offers real heating efficiency during the cold season. AirGreen also emphasizes optimizing the building envelope (air leaks, insulation, distribution): because a system that looks "excellent on paper" quickly loses its advantages if the air is poorly distributed.
Our AirGreen method to ensure ducted air conditioning “works well”
A ducted system isn't just the unit itself: it's the entire distribution engineering . Here's what we systematically secure:
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Duct design (diameters, lengths, pressure losses)
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Balancing flow rates (to avoid a freezing cold bedroom and an overheated living room)
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Air return management (often neglected, but essential)
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Maintenance access (hatch, filter, service area)
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Roof protection (support, vibration, clearances)
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Clean finish (routing, fixing, sealing of penetrations)
That's what makes the difference between "it's noisy" and "it's actually comfortable".
Common mistakes to avoid (and which are costly in the long run)
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Installing a ducted air conditioning system without a proper ductwork study
Result: noise, losses, poorly served areas. -
Underestimating the importance of air return
Without a well-designed return system, pressure increases, comfort decreases, and the machine is strained. -
Installing on the roof without a winter strategy
Too low a unit = risks of icing, obstruction and reduced performance. -
Neglecting anti-vibration
A silent ducted unit… but a compressor that transmits vibrations: total inconsistency.
Recommended maintenance for a ducted system
To maintain performance and air quality:
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Filters : check regularly (often every 1–3 months depending on usage)
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Annual inspection : drains, heat exchanger, static pressure, condition of accessible pipes
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Periodic thorough cleaning : depending on the environment (dust, animals, renovations)
A well-maintained ducted system remains stable, quiet, and durable.
Conclusion: a “discreetly high-end” choice perfectly suited to Rosemont
This Gree Gainable installation in Rosemont–La Petite-Patrie illustrates exactly what is sought after in residential Montreal: a high-performance, discreet system, installed with rigor — especially when the outdoor unit has to live on a flat roof exposed to the seasons.
At AirGreen, we don't just sell a machine: we deliver a measurable result on a daily basis — comfort, silence, finish and reliability.