In Ville-Marie, flat-roofed buildings and modern condominiums often present a unique challenge for HVAC systems: year-round comfort is desired without cluttering balconies, compromising aesthetics, and respecting technical constraints (access, clearances, vibrations, noise, drainage). It was precisely within this context that we installed a Gree Charmo wall-mounted heat pump , with an outdoor unit positioned on a gravel roof .
The photo clearly shows the Gree Charmo outdoor unit (condenser) with the Inverter designation, an AHRI Certified sticker, and our AirGreen Air Conditioning & Heating label. You can also see a clean installation of the refrigerant lines, protected by white insulation, and a raised support designed to stabilize the equipment above the roof surface.
Why choose a Gree Charmo wall-mounted heat pump in Ville-Marie?
In Ville-Marie, one often encounters:
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condos where interior space is precious;
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condominium rules regarding noise and visibility;
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air conditioning needs in the summer (urban heat island) and efficient heating in the mid-season, or even in winter.
The Gree Charmo wall-mounted heat pump responds very well to these realities thanks to Inverter technology (power modulation) which helps to maintain a stable temperature, reduce on/off cycles, and promote more constant daily comfort.
For our clients, the goal is not just “to have cold air”: it is to obtain a system that heats and cools , that remains discreet , and that integrates well with the typical constraints of a building in Ville-Marie.
Type of system installed: wall-mounted heat pump (mini-split)
The type of machine here is unambiguous: the compact outdoor unit, with an axial fan and a "block" format, corresponds to a wall-mounted heat pump (mini-split). This format is particularly popular in Montreal, Laval, and on the South Shore/North Shore because it allows for:
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an installation without major ductwork work;
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excellent room-by-room control (depending on the interior configuration);
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interesting energy efficiency, especially in mid-season.
Visible installation details and important technical points
1) Installation on a gravel roof: stability and protection
In Ville-Marie, the roof is often the best location for the outdoor unit when:
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The facades are regulated,
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The balconies are too small.
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or that one wants to minimize the visual impact.
Here, the unit is installed on a raised support , which offers several advantages:
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better protection against the accumulation of water and debris;
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reduction of risks related to snow and ice (depending on the roof configuration);
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Improved clearance for air circulation.
2) Vibration management: comfort for occupants
Even a very good heat pump must be installed in a way that limits the transmission of vibrations. The photo shows decoupling elements (brackets/support points) between the unit and its mounting bracket. In a dense urban area like Ville-Marie, this is essential because:
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to preserve the tranquility of the occupants,
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to avoid resonances in the structure,
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comply with the condominium requirements.
3) Insulated refrigeration connections: durability and performance
The pipes are well insulated (white sheath) and neatly routed. Adequate insulation:
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improves efficiency (less heat loss),
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limits condensation
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protects pipes against premature wear.
4) Clearances and air circulation
One detail too often overlooked: the condenser needs to breathe. On a rooftop, we want:
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sufficient clearance around the unit,
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a logical approach to avoid "blowing" towards an obstruction,
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and a configuration that facilitates maintenance (access to the panel, cleaning, service).
At AirGreen, we always plan the location so that the actual performance on the ground lives up to the advertised performance.
What this type of installation actually changes for the customer
Everyday comfort
With a Gree Charmo wall-mounted heat pump, the customer typically looks for:
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a stable temperature (fewer variations);
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quick comfort on very hot days;
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efficient heating during transition periods (autumn/spring).
Discretion and integration into the building
Placing the outdoor unit on the roof helps to:
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reduce the visual impact from the street;
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free up living spaces (balcony/terrace);
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limit noise complaints, especially in condominiums.
Simplified maintenance… when it's well thought out
A clean and accessible installation also saves time during maintenance:
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seasonal cleaning of the outdoor unit;
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checking the pressure and the condition of the fittings;
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inspection of supports and level;
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drainage control (depending on the configuration).
AirGreen's best practices for a sustainable installation in Montreal
Every construction site in Greater Montreal has its “pitfalls”: wind on roofs, freeze/thaw cycles, restricted access, condominium regulations, etc. For this type of installation, we systematically apply principles that make a real difference:
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Robust and elevated support adapted to the surface (here, gravel roof).
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Vibration reduction to protect acoustic comfort.
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Clean, isolated and secure routing of the pipes.
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Clearances respected to ensure good air circulation.
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Aesthetic approach : discreet, clean, and professional.
It is often this level of finish that distinguishes a “correct” installation from a truly successful one, especially in an urban context like Ville-Marie.
Common mistakes to avoid (and that we often correct)
In central Montreal, we still see far too often:
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units placed too low, exposed to stagnant water;
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undersized supports (vibrations, instability);
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a lack of clearance (overconsumption, wear);
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poorly insulated pipes (condensation, losses, premature aging).
A high-performance heat pump like the Gree Charmo deserves a proper installation, otherwise some of the benefits are lost: comfort, efficiency, longevity.
Conclusion: a Gree Charmo perfectly suited to Ville-Marie
This installation in Ville-Marie illustrates exactly what many owners and co-owners in downtown Montreal are looking for: an efficient , discreet solution that is neatly integrated into the building.
With a Gree Charmo wall-mounted heat pump , installed on the roof with a raised support and careful execution, you get a system that meets urban requirements while offering concrete comfort, day after day, summer and winter.