Installation of a Gree wall-mounted air conditioner in Saint-Laurent
AirGreen installed a Gree Inverter wall-mounted air conditioner in Saint-Laurent. A quiet, energy-efficient, and aesthetically pleasing HVAC solution, ideal for Montreal apartments.
Take a tour of the installation
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.
An HVAC solution perfectly adapted to Montreal’s realities
At AirGreen , every installation is an opportunity to combine technical expertise with sustainable comfort. Recently, in an apartment in the Saint-Laurent sector of Montreal , we carried out the complete installation of a Gree Inverter wall-mounted air conditioner . This operation allowed the owner to considerably improve his summer comfort while optimizing the energy consumption of his home.
Choosing a Gree Inverter wall-mounted air conditioner
The client was looking for a reliable, affordable and durable solution to efficiently air condition a small space. The chosen model, a 12,000 BTU Gree Inverter , proved to be the ideal compromise:
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Inverter technology : allows continuous adjustment of power according to actual needs.
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Energy savings : significant reduction in electricity costs thanks to better compressor management.
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Quiet operation : essential in a residential environment.
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Compatibility with Quebec subsidies , thanks to its Energy Star certification.
A neat two-step installation
1. Installation of the indoor unit
The wall-mounted headboard was strategically positioned in a narrow hallway, optimizing airflow despite the limited layout. We installed discreet white capping to conceal the refrigerant pipes and drain, ensuring a stylish and durable finish.
2. Installation of the outdoor unit
The outdoor unit was securely installed against a typical Montreal red brick wall, sheltered from direct weather.
The key points of this step:
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Sturdy wall mount to ensure device stability.
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Insulated refrigeration lines to maximize energy performance.
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Protected electrical wiring that complies with Quebec safety standards.
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Gravity drainage of condensates, avoiding the addition of a pump and reducing maintenance risks.
Challenges encountered and solutions provided
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Limited interior space : installation at height to ensure optimal air diffusion.
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Exterior brick wall : technical drilling carried out with precision to ensure the watertightness and solidity of the fixings.
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Aesthetics : installation of discreet cappings, integrated into the color of the walls, in order to provide a professional finish.
Concrete benefits for the customer
Thanks to this installation:
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The indoor temperature is now constant and comfortable even on hot days.
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The system operates silently , ideal for an urban apartment.
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The owner benefits from an energy-efficient solution which qualifies for government subsidies .
Why choose AirGreen for your HVAC installation in Montreal?
With hundreds of successful installations in Greater Montreal , we put our know-how at the service of each project:
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Personalized assessment based on your space and needs.
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RBQ certified technicians trained to the highest standards.
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Turnkey service including installation, commissioning and maintenance advice.
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Extended availability in Montreal, Laval, Longueuil, the North Shore and the South Shore .
Energy subsidies and savings
The Gree Inverter wall-mounted air conditioner is recognized for its energy efficiency, allowing it to obtain rebates and subsidies through programs such as Rénoclimat and Transition Énergétique Québec . These incentives reduce the initial investment and promote a rapid return on investment.
Conclusion
This installation of a Gree Inverter wall-mounted air conditioner in Saint-Laurent demonstrates AirGreen's ability to meet technical requirements while delivering a high-performance, aesthetically pleasing, and durable system. The customer now enjoys optimal comfort and lower energy bills, with the peace of mind that comes with professional installation.
The big day, step by step
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 would it look like 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.
Four mistakes we do not make
Flip each card to see what we do instead.
Your own project, step by step
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.
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.
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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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).