Four-season comfort in a bright living room: our AirGreen approach for a perfectly integrated wall unit
The context of the project
In Chomedey (Laval) , we were commissioned to modernize the comfort of a south-facing open-plan home. The client's goal: a discreet, quiet, and economical HVAC solution capable of providing heating in the winter and air conditioning in the summer without invasive work or ductwork. We offer a Lennox wall-mounted heat pump , installed high above a bay window dressed with horizontal blinds. This configuration optimizes air diffusion while preserving natural light and the aesthetics of the room.
Why a Lennox wall-mounted heat pump here?
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High seasonal efficiencies to reduce energy bills in heating and cooling mode.
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Stable operation in cold weather thanks to inverter technology, ideal for the climate of Greater Montreal .
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Low noise level for acoustic comfort in a living room.
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Compact size and neutral design that fits above the window frame without encroaching on space.
Airflow and positioning study
Installing a unit above a window requires careful attention to airflow and clearances :
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The motorized shutter directs the treated air beyond the upper strip of the blinds to avoid immediate recirculation and areas of turbulence.
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Sufficient clearance from the ceiling is maintained so that the upper suction remains free.
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The blowing axis is calibrated to sweep the open area to the passage areas, without blowing directly onto the relaxation area.
Key Steps in HVAC Installation
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Tracking and tracing
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Checking the structure (uprights, rails) for durable fixing of the wall plate .
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Choose a drilling point with a slight outward slope for a reliable gravity drain .
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Drilling and routing
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Clean core approximately 65–75 mm to accommodate insulated refrigerant pipework , communications cabling and condensate.
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Total length of connections typically between 4 and 6 meters to reach the external condenser, minimizing bends.
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Brazing and flaring
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Production of copper connections (with nitrogen flushing) to prevent internal oxidation and ensure watertightness.
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Condensate management
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Priority to the gravity drain ; if the external configuration requires an ascent, we integrate a silent lifting pump with non-return flow stopper and simplified maintenance.
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Finishing and sealing
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Outside, installation of a white UV protective cover (capping) , discreet on pale siding and resistant to Laval winters.
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Elastomeric mastic and vapor barrier sealing to preserve the building envelope.
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Vacuum and charging
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Deep vacuum (< 500 microns) with resistance test, then opening of the valves. Pressure , superheat and subcooling control according to Lennox specifications.
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Testing and balancing
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Airflow measurements, temperature differences and sound levels . Adjustment of blowing, sweeping and setpoint parameters for consistent comfort.
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Details of integration into the room
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The unit is installed at the top of the wall , just above the lintel, to free up space and maximize reverse stratification in heating (hot air blown diagonally towards the room mixes then descends).
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Horizontal blinds do not interfere with the suction or the shutter. We validate the gap and the travel of the apron to avoid any contact.
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A dedicated outlet protected by an appropriate circuit breaker is provided according to the power of the indoor head and the manufacturer's requirements.
Result: measurable comfort
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Stable and uniform temperature in the living area, with a comfortable setting.
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Reduction of short cycles thanks to the variator, which limits overconsumption.
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Significant energy savings compared to a traditional air conditioner and a resistance heater.
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Silent operation that is quickly forgotten, even during peak heat.
Daily usage tips
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In hot weather, leave the speed in auto and a realistic setting to avoid sudden deviations.
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In cold weather, use continuous heating mode ; avoid switching back and forth between settings.
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Enable scanning for better diffusion in open areas.
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Program schedules if the unit is Wi-Fi compatible to anticipate needs.
HVAC Maintenance: What We Recommend
Regular HVAC maintenance extends lifespan and maintains performance:
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Clean washable filters every 4 to 8 weeks depending on use.
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Annual check of the exchange battery and fan to remove deposits.
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Drain control (gravity or pump) to prevent overflows.
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Inspection of refrigeration connections and exterior capping after winter (freezing/thawing).
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Professional measurements of refrigeration and electrical parameters as part of an annual AirGreen inspection.
Grants and Eligibility
High-performance wall-mounted heat pumps , like the Lennox installed here, are generally eligible for assistance programs in Quebec. Depending on seasonal performance and low-temperature operating range, provincial and, depending on the period, municipal incentives may apply in Montreal, Laval, Longueuil, the North Shore , and the South Shore . We assist our clients in verifying criteria and preparing files to maximize amounts.
Technical highlights of this installation
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Optimized installation height to avoid excessive stratification and release suction.
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Controlled slope drilling for a reliable drain and a perfectly sealed wall.
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Short connection routes to limit load losses and facilitate future interventions.
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Discreet finishes : clean exterior passage, harmonized capping, careful sealing.
What if your setup is different?
Every home in Greater Montreal presents its own challenges: brick walls, vinyl siding, attic rooms, mezzanines, narrow balconies, and limited side aisles. Our team adapts:
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Wall or floor slab supports for the condenser, with snow clearance and snow guards if necessary.
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Quiet condensate pump for zero gravity configurations.
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Winter protection (clearances, defrost management) to maintain performance in extreme cold.
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Multi-zone solutions if several parts need to be treated, while respecting the maximum lengths and heights of the connections.
Good practices to remember
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Sizing : Choose the BTU/h appropriate for the actual surface area and the building envelope. A unit that is too large results in short cycles; too small, it struggles in heat waves or extreme cold.
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Location : Choose a clear interior wall , away from sources of steam or grease. Avoid direct airflow onto rest areas.
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Electricity : circuit compliant with the requirements, calibrated circuit breaker, external circuit breaker for the condenser.
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Finishing touches : think about aesthetic lines and maintenance (access to filters, cleaning, clearance around the condenser).
Why AirGreen
We operate daily in Montreal, Laval, Longueuil, North Shore, South Shore for custom HVAC installations . Our strength: an accurate diagnosis , certified teams , and an execution that values both performance and cleanliness of the site . Each project is delivered with usage explanations, maintenance advice and, if necessary, a maintenance plan .
Conclusion
This Lennox wall-mounted heat pump installed in Chomedey illustrates our way of integrating an efficient, discreet and sustainable solution into a bright living space. The combination of rigorous sizing , optimized routing and fine tuning ensures constant comfort throughout the year, with contained operating costs. For a similar project in Montreal , Laval , Longueuil , on the North Shore or South Shore , we provide support from the study to commissioning, including subsidies.