A high-perched position that transforms the comfort of an open space
At AirGreen , we love precise and efficient projects. In this house in Chomedey (Laval) , our team installed a Gree wall-mounted heat pump above a large patio door opening onto the backyard. The wall is exterior, the ceiling height is generous, and natural air circulation is from the living room to the open-plan kitchen. This positioning, designed to cover the entire living area, maximizes the blowing range in summer and beneficial stratification in winter, while freeing up the walls of the rooms for furnishings.
Why this location choice works
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Optimal diffusion : placed high and centered in the living area, the device circulates the air along the entire length of the room and covers adjacent areas.
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Direct access to the exterior : the drilling is done at the back of the head, limiting the length of the refrigerant connections and facilitating maintenance.
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Simple drain management : gravity is sufficient to drain condensate, avoiding the need for a pump and its maintenance.
What we install: a Gree wall-mounted heat pump designed for our climate
Gree wall-mounted units are renowned for their reliability in Quebec. On this project, we're using a typical capacity of 12,000 BTUs —perfect for a well-insulated, open-plan space of 450 to 700 sq. ft. The unit provides:
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Efficient cooling with a high SEER2 , reducing summer energy costs.
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Stable heating with an optimized HSPF2 and reliable operation down to -25°C , very useful during cold peaks in Laval and Montreal.
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Inverter compressor : fine modulation, fewer on/off cycles, quiet and long-lasting.
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Multi-stage filtration : improved indoor air quality, a plus for seasonal allergies.
The range is Energy Star , a condition often required for grants available in Greater Montreal (depending on eligibility and current programs). At AirGreen, we support clients in preparing their files.
Anatomy of a Successful HVAC Installation in an Open Plan Area
Step 1 — Study the wall and prepare
Our technicians validate the thickness, composition, and presence of framing, wiring, or conduits. Above a patio door, the lintel requires precise lateral drilling to penetrate the wall without disturbing the structural reinforcement. We protect floors and moldings, then install a stable articulated ladder for working at height.
Step 2 — Drilling and crossing
The through hole (usually about 65 mm ) receives a vapor barrier sleeve to ensure a seal and prevent the infiltration of humid air. The slight outward slope ensures gravity flow of the drain. We then laser-fit the inner head plate and hang the unit.
Step 3 — Refrigerant Connections and Aesthetics
The insulated copper connections, the communication cable and the drain are grouped behind the head and exit directly to the outside. Outside, we install a discreet white capping , matching the coating, to protect the pipes from UV rays and impacts. The total length of the lines remains very short (often ≤ 3 m), which reduces pressure losses and optimizes the performance of the heat pump .
Step 4 — Condenser at height… or on slab
In our projects in Laval and on the North Shore , we favor wall supports 16–18 inches from the finished floor to keep the unit away from snow and promote defrosting. Depending on the site, an anti-vibration slab may be used. We add silent blocks and verify the required clearances for service.
Step 5 — Connections, vacuuming and commissioning
We perform a deep vacuum (≤ 500 microns) and a nitrogen leak test . The power supply is connected in accordance with the circuit breaker rating and CSA standards. Finally, we configure the machine (auto mode, speed, sweep) and instruct the customer on proper use.
Salient installation details observed on this site
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High installation height : improves blowing range and clears the patio door.
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Gravity drain : no pump, less maintenance and less risk of water alarms.
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Direct crossing : short connections, superior performance and clean aesthetics (aligned exterior capping).
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Clean work : protections, minimalist visual, respect for moldings and existing paint.
Results obtained: consistent comfort, controlled energy bill
After commissioning, the customer notes:
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Rapid reduction of indoor temperature in hot weather, without unpleasant drafts.
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Efficient supplemental heating in spring and fall, reducing the use of the main system.
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Very low noise (inside and outside), an advantage in a dense residential area like Chomedey .
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Reduced consumption thanks to the inverter, high SEER2/HSPF2 and short connections.
AirGreen tips for using a wall-mounted heat pump
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Settings : In summer, keep the fan speed on Auto to let the machine modulate; in winter, aim for 22–23°C with vertical sweep activated to break stratification.
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Filters : Rinse every 6–8 weeks during the usage season.
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Clearances : do not stick anything in front of the headboard; avoid thick curtains at the edge of the patio door.
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HVAC maintenance : an annual visit extends the lifespan (evaporator/condenser cleaning, condensate check, electrical checks).
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Winter : if the condenser is wall-mounted, keep the space free of snow and ice; on a slab, provide a snow guard if the site is exposed.
Common Mistakes…and How We Avoid Them
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Head too low above a patio door : airflow blocked by the transoms and risk of soiling; we place high and in the center .
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Drain without slope : water stagnation and droplets; we check the actual slope before closing.
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Connections too long : pressure losses and noise; we design a direct route with tight capping.
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Condenser too low : frost and recirculation; we use wall brackets at the correct height or a raised slab.
Why AirGreen for your installation in Montreal, Laval, Longueuil, North Shore and South Shore?
Our team understands the constraints of local homes: vinyl walls, lintels over patio doors, courtyard access, close neighborhoods. We plan the HVAC installation to minimize visual impact, optimize performance, and facilitate maintenance. From BTU selection to grant assistance, we support you from quote to start-up, then after-sales service .
In short : a Gree wall-mounted heat pump properly positioned above a patio door is a real game-changer in an open space. In Chomedey, as elsewhere in Greater Montreal, AirGreen delivers clean, efficient, and sustainable results.