Project context and client expectations
On Nuns' Island, many condominium owners are looking for efficient heating and cooling without encroaching on their living space. In this recent condo with a flat ceiling, the client wanted:
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a compact and quiet wall-mounted heat pump ;
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homogeneous diffusion in the open area;
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clean integration without visible chutes;
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a solution compatible with co-ownership rules (external noise, drilling, aesthetics).
After inspection, we recommended an LG wall unit with Inverter technology , known for its fine modulation, low noise level and motorized shutter allowing good airflow in open geometry rooms.
Initial diagnosis: structure and path of the connections
Our technical visit highlighted several key elements:
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Installation height : approx. 2.40–2.50 m, ideal for capturing warm air in winter and propelling cool air in summer.
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Wall corner : location chosen to clear airflow towards the living area without blowing directly onto the sleeping area.
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Diffusair on the ceiling (visible round mouth): presence of an air exchanger (VRC/ERV) in the building; we adjusted the orientation of the heat pump flap to avoid air recirculation and discomfort currents.
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Refrigerant connection route : right-hand side outlet to the exterior wall; short wall crossing , limiting pressure losses and facilitating HVAC maintenance.
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Condensate drainage : prioritized gravity configuration (reliable and quiet); addition of a backflow prevention device and slope control to prevent any backflow.
Choice of equipment and technical criteria
Without oversizing, we selected a capacity adapted to the thermal envelope of the condo and the sunlight of the windows. LG Inverter wall units:
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modulating from low to high speed depending on the actual load;
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optimize seasonal efficiency (electricity savings);
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ensure controlled acoustics (compressor and variable speed fan);
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offer multi-stage filtration for cleaner indoor air;
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offer anti-cold functions and intelligent defrosting useful in Montreal's climate.
AirGreen Sizing Tip
In condos, we favor a room-by-room analysis rather than a “guesstimate” calculation. A well-sized unit runs longer at low speed, which reduces noise , stabilizes the temperature and limits wear .
Architectural integration: invisible, but thought out
In order to respect the refined aesthetics of the accommodation:
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Precise tracing of the installation template and anchors in a load-bearing wall area;
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Clean caulking around the hole to ensure airtightness;
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Alignment of the unit with the ceiling and furniture lines for a smooth visual reading;
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Short routing of connections behind the device, minimizing the use of visible capping .
The result: a discreet installation , without any visible projections or cable ducts in the living area.
Condensate Management: Reliability First
In a condo, an overflow can be expensive. So we have:
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favored gravity flow (zero noise, zero motorized maintenance);
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controlled the continuous slope (>1%) to the discharge point;
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installed an odor damper to prevent backdrafting;
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carried out a tank filling test with verification of the actual flow rate.
If gravity had not been possible, we would have opted for a silent tank condensate pump with an access hatch, but here the layout offered a perfect natural exit.
Electricity and compliance in co-ownership
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Dedicated circuit conforming to manufacturer requirements;
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Circuit breaker suitable for the nominal current of the wall unit;
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Compliance with the rules for drilling into the co-ownership and distances from common structures;
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Complete documentation for the union : technical data sheets, noise levels, drilling and drainage diagrams.
Commissioning and optimization of settings
Our commissioning protocol includes:
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Extended vacuum and leak test (prevention of micro-refrigerant leaks).
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Check for overheating/subcooling based on ambient temperature.
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Flap calibration : angle orientation to sweep the open area without drafts on the sofa.
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Comfort settings : activation of eco mode, programming of day/night temperatures, and seasonal usage advice.
Result: thermal stability felt in a few minutes and an almost imperceptible noise level at reduced speed.
HVAC Maintenance: What We Recommend
To maintain efficiency and air quality :
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Clean filters every 4 to 8 weeks during periods of heavy use;
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Annual AirGreen inspection : coil, fan, condensate pan, electrical controls;
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Check the drain in spring (start of cooling season);
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Gentle disinfection of exchange surfaces to limit dust and biofilms.
Regular HVAC maintenance extends lifespan, protects warranty , and maintains stable consumption year after year.
Thermal comfort in Montreal's climate
In Montreal , between summer humidex and biting cold, a well-installed wall-mounted heat pump covers most of the needs of a high-performance condo:
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Summer : efficient dehumidification, uniform temperature without overcooling;
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Mid-season : low-speed modulation, substantial savings;
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Mild winter : comfortable main heating; at peak times, the electric backup takes over if necessary.
Why this installation works so well on Nuns' Island
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Condo architecture : open volumes, regular ceilings, insulated facades → ideal diffusion of a wall unit .
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Controlled noise : co-ownership requirements met thanks to inverter modulation and careful installation.
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Simplified maintenance : direct access to filters and drain; short route therefore fewer points of failure.
Common Pitfalls…and How We Avoid Them
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Poorly sealed hole → air infiltration and condensation: we apply multi-layer caulking (insulation + air barrier).
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Drain without constant slope → drops and odors: we validate the slope at the level and test the flow rate.
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Badly directed blowing → cold zones: we configure the shutter and, if necessary, adjust the fins to bypass the air returns from the VRC.
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Oversizing → short cycles, noise, wear: we size the power as precisely as possible.
Customer Return
From the first week of use, the customer notes:
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a uniform temperature in the living room and office area;
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a significant reduction in perceived noise compared to the old device;
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simple control via remote control and time programming.
AirGreen: Your Local HVAC Partner
AirGreen supports co-owners and property managers in Montreal , Laval , Longueuil , on the North Shore and the South Shore . Our strength: clear technical advice , rigorous installations and responsive after-sales service .
Are you planning to install a wall-mounted heat pump in a condo? We will assess the wiring, condensate management , acoustic impact, and condominium compatibility on site.
Express FAQ
Is this installation eligible for subsidies?
Certain eligible wall-mounted heat pumps (depending on performance and current programs) may qualify for grants. We systematically verify the criteria when providing the quote.
What if gravity drain is not possible?
We offer a quiet condensate pump with an overflow alarm and maintenance access. We optimize the location to keep the installation discreet.
And in multi-zone?
If multiple rooms require dedicated control, we design MultiZone systems with 2 to 5 heads, maintaining aesthetics and compliance with condominium regulations.
What we deliver to every project
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Transparent sizing ;
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A clean and documented execution ;
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A complete commissioning ;
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A simple maintenance plan ;
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An available and local service .
At AirGreen , we install wall-mounted heat pumps that you can forget about... except in your electricity bills.
Next step
Contact us for an on-site evaluation in Montreal , Laval , Longueuil , on the North Shore or the South Shore . We tailor the installation to your space, not the other way around.
Keywords worked on (integrated naturally) : heat pump , wall-mounted heat pump , wall-mounted air conditioner , HVAC installation , HVAC maintenance , Montreal , Laval , Longueuil , North Shore , South Shore , Nuns' Island .