Installation of a Gree wall-mounted heat pump in Outremont
Installation of a Gree wall-mounted heat pump in Outremont: a technical project carried out in a stairwell, providing optimal comfort and energy efficiency for the entire house.
In summer, the outdoor unit rejects the house's heat outside.
Generic illustration of this type of installation, not a survey of this job site. Tap a number.
Mounted level on a wall plate, high enough for the air to reach the whole room, with enough space around it to slide the filters out easily.
The refrigerant lines, the communication cable and the drain go through the wall in a single opening, sealed against water, cold air and insects.
Two insulated copper pipes connect the two units. Outside, a line cover can protect them from sun, knocks and weather.
A shut-off switch near the outdoor unit isolates it safely for service. It must stay accessible at all times.
The compressor and the fan. In heating mode it captures heat from the outdoor air, even in winter, and moves it inside.
On the ground or on the wall, it keeps the unit above accumulated snow. The unit stays clear and defrost water can drain away.
The fan needs to blow freely. Storage, a fence or a wall too close, and efficiency drops while noise goes up.
A demanding residential project in a stairwell
At AirGreen , we regularly work in residential contexts where limited space and height pose particular challenges. The recent installation of a Gree wall-mounted heat pump in a home in Outremont perfectly illustrates this type of situation. The indoor head was positioned above the central staircase, a strategic location to ensure optimal diffusion of fresh air in summer and heat in winter, but one that requires careful planning and technical know-how.
Why install a wall-mounted heat pump in a stairwell?
A central staircase is often a natural air circulation point. Placing a wall-mounted heat pump in this space maximizes the distribution of comfort to the various rooms on the upper and lower floors. Air circulates freely, reducing areas of uneven heat or cold. Furthermore, in a typical Outremont home with relatively high ceilings, this positioning contributes to remarkable temperature uniformity.
Installation Steps
1. Access and security
Installing a device high above a staircase requires mobile scaffolding or an articulated ladder, as in this project. The priority is to ensure the safety of technicians while protecting the surrounding surfaces (walls, railings, flooring).
2. Drilling and passing the conduits
The exterior wall must be precisely drilled to accommodate the refrigerant pipes, electrical wiring, and condensate drainage pipe. In this case, discreet, neutral-colored capping was installed to protect the connections and maintain a neat aesthetic both inside and out.
3. Condensate management
Given the height and the absence of a possible gravity slope in the staircase, a condensate pump was integrated to evacuate the water to the outside. This is an essential detail in this type of configuration.
4. External connection
Outside, the compressor has been positioned on an anti-vibration slab to reduce noise and ensure the stability of the unit, even during the severe winter cold experienced by Outremont.
Features of the installed Gree heat pump
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Type : Wall-mounted heat pump (mini-split)
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Capacity : 12,000 BTU, suitable for an area of approximately 550 to 700 sq. ft.
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Energy efficiency : High SEER2 and HSPF2 optimized for heating down to -25°C
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Certification : Energy Star, making the system eligible for provincial and federal subsidies (notably LogisVert and Greener Homes)
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Warranty : 10 years parts and compressor
Technical challenges met
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Working height : securing the installation above the stairs.
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Condensate drainage : installation of a reliable pump to prevent any water infiltration.
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Aesthetics : discreet integration of conduits inside and outside.
These elements demonstrate the rigor and attention to detail of our teams, even in the most restrictive installation situations.
Result: year-round comfort
Thanks to this installation, the house now benefits from:
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optimized comfort in summer and winter ,
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a significant reduction in energy costs thanks to the efficiency of the system,
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and a harmonized interior environment , since the air circulates freely from the top of the stairs to the living areas.
At AirGreen, we understand that every home in Outremont, Montreal, Laval, Longueuil, the North Shore, and the South Shore has its own unique characteristics. That's why our teams tailor each HVAC system installation to the specific needs of the space and its occupants.
How it goes, from the first call to the end
The main steps of this kind of job at AirGreen. Every house has its quirks: the estimate brings them out.
We look at the room, the outside wall, the line route and where the outdoor unit will go. That is where the capacity gets chosen.
Model, capacity and price, in writing. We also check whether the model qualifies for assistance programs.
Floors and furniture protected, wall plate position marked level, wall opening located.
A single opening, with the slope the drain needs to flow outside.
Set on a stand raised above the snow, with the clearances the manufacturer requires.
Connected, insulated and protected. The opening is then sealed against water, cold air and insects.
A dedicated circuit and an accessible disconnect near the outdoor unit.
Leak test, vacuum, then start-up and a check of heating and cooling.
Remote, modes, filters: we show you the essentials before we leave.
- The on-site estimateWe look at the room, the outside wall, the line route and where the outdoor unit will go. That is where the capacity gets chosen.
- The quoteModel, capacity and price, in writing. We also check whether the model qualifies for assistance programs.
- Getting readyFloors and furniture protected, wall plate position marked level, wall opening located.
- The wall openingA single opening, with the slope the drain needs to flow outside.
- The outdoor unitSet on a stand raised above the snow, with the clearances the manufacturer requires.
- Lines, cable and drainConnected, insulated and protected. The opening is then sealed against water, cold air and insects.
- The electrical workA dedicated circuit and an accessible disconnect near the outdoor unit.
- Tests and start-upLeak test, vacuum, then start-up and a check of heating and cooling.
- The walkthroughRemote, modes, filters: we show you the essentials before we leave.
And at your place?
Two quick checks with real numbers: what heat costs, and what your current heaters add up to in BTU/h.
Conversion: 1 W = 3.412 BTU/h. An indication, not a load calculation: baseboards and furnaces are often stronger than the real need, and they can stay as backup. AirGreen confirms the capacity on site.
What to do, season by season
Three habits per season for this unit. They take a few minutes and prevent many calls.
- Clean the indoor unit's filters.
- Clear leaves and debris left on the outdoor unit by winter.
- Test cooling before the first hot days.
- Clean the filters more often when the unit runs a lot.
- Keep plants away from the outdoor unit.
- Check that no water drips from the indoor unit.
- Rake the leaves around the outdoor unit.
- Test heating before the first cold days.
- Book periodic maintenance before winter.
- Keep snow away from the stand and the front of the unit.
- Let the unit defrost: it is normal.
- Never hit the ice on the fins; call us if the unit stays iced up.
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What people ask us about this kind of work
Does a wall-mounted heat pump heat in winter?
Wall-mounted or multi-zone: how do I choose?
Where does the outdoor unit go?
Are there grants?
Do I need a permit?
How cold can it heat?
How much can I save?
How is the LogisVert assistance calculated?
Is it noisy?
The outdoor unit is covered in ice: is that normal?
Does AirGreen hold the required licences?
Is the estimate free?
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Text and photo: a real AirGreen Climatisation & Chauffage job. The diagrams are generic illustrations of the type of installation, not a survey of this job site. Sources of the added figures: airgreen.ca product pages (NEEP / AHRI performance), Hydro-Québec (Heat pumps page, LogisVert, read on 13 October 2026), Régie de l’énergie (rate D as of 1 April 2026).