Installation of a Gree wall-mounted heat pump in Saint-Laurent
Installation of a Gree wall-mounted heat pump in Saint-Laurent. AirGreen provides complete HVAC services in Montreal, Laval, Longueuil, North Shore, and South Shore.
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The article, chapter by chapter
An efficient HVAC solution for the comfort of a brick home
At AirGreen , we have just completed a new Gree wall-mounted heat pump installation in the residential sector of Saint-Laurent, Montreal . This intervention perfectly illustrates our expertise in HVAC installation in the residential areas of Greater Montreal, where heating and air conditioning needs combine with space and aesthetic constraints.
Project background
The client, a brick homeowner, wanted a modern, high-performance energy solution to replace an old air conditioning system that had become noisy and energy-intensive. We recommended a Gree Inverter wall-mounted heat pump , renowned for its reliability, efficient heating even at low temperatures, and its eligibility for energy subsidy programs available in Montreal, Laval, Longueuil, as well as on the North and South Shores.
Technical details of the installation
The installation took place at the back of the house, under a sliding window, an ideal location to protect the condenser from the elements while facilitating maintenance. Here are the highlights of the installation:
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Machine type : Gree single-zone wall-mounted heat pump (Inverter).
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Support : outdoor unit fixed on sturdy wall brackets, allowing optimal clearance from the ground to avoid snow accumulation in winter.
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Wiring and refrigeration connections : discreet passage under white capping adapted to the brick, guaranteeing aesthetic integration and protection against UV and humidity.
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Electrical connection : secure installation via a disconnect box, in compliance with Quebec electrical standards.
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Condensate management : gravity drainage, which simplifies maintenance and reduces the risk of pump breakdowns.
Challenges and solutions
One of the main challenges of this installation was the close proximity to a window. We carefully positioned the outdoor unit to ensure both convenient access for maintenance and optimal air circulation. Another challenge was managing the refrigeration connections along the brick wall: our team used white capping to harmonize the installation, protect the ducts, and extend the overall durability.
Results for the client
The customer now benefits from:
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Four-season comfort thanks to an efficient heat pump for summer air conditioning and winter heating.
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A significant reduction in energy consumption, particularly in heating mode compared to the old system.
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A discreet, secure and aesthetic installation that enhances your property.
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Access to provincial and federal grant programs , which significantly reduce the initial investment.
Why choose a Gree heat pump with AirGreen?
Gree heat pumps offer an excellent compromise between performance, durability, and cost. They are designed to operate efficiently even during the harsh winters of Montreal and the North Shore. At AirGreen , we not only sell and install wall-mounted and central heat pumps , but also provide complete HVAC maintenance to ensure maximum longevity and optimal energy efficiency.
AirGreen: your HVAC partner in Montreal, Laval, North Shore and South Shore
This installation in Saint-Laurent joins a long list of projects completed by our teams throughout Greater Montreal. Whether it's a condo downtown, a suburban home in Laval, or a family residence on the South Shore, we always adapt our approach to offer personalized and sustainable service .
Are you considering improving your home's comfort with a Gree heat pump or other HVAC system? Trust AirGreen , your HVAC installation and maintenance specialist throughout Greater Montreal.
The job tools
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.
How the job unfolds
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.
What we check on a job like this one
Each number is a point we check on site. Switch between summer and winter to watch air and heat move.
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.
Is your home ready?
Check what applies at your place. A "no" is not a refusal: it is what we sort out during the estimate.
Good habits, once the unit is in place
Six simple habits that keep the unit going. Your list stays on this device.
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.
The right pages, at the right time
Four statements: true or false?
It all comes down to details you have just seen.
1. In heating mode, the outdoor unit can produce water.
During defrost cycles. That water must drain away without forming ice.
2. You pick the capacity with a simple square-footage rule.
Windows, insulation, orientation and how the room is used all count. Capacity is chosen on site.
3. A multi-zone connects several indoor heads to a single condenser.
One head per room, all on the same condenser. Each room keeps its own temperature.
4. The disconnect can sit behind the patio furniture.
It must stay accessible: it is what shuts the unit off for service.
0 / 4 right answers
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?
No question matches. Write to us: we answer.
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An on-site estimate, the right capacity, the right equipment.
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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).