Installation of a Gree wall-mounted heat pump in Rosemont–La Petite-Patrie
Installation of a Gree wall-mounted heat pump in Rosemont–La Petite-Patrie by AirGreen. Increased comfort, energy savings, and grants available in Greater Montreal.
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The article, chapter by chapter
Improving the comfort of a Montreal home with a custom installation
At AirGreen , we are regularly called upon to work in Montreal homes where thermal comfort requires a reliable and sustainable solution. This is exactly the case with this project in Rosemont–La Petite-Patrie , where our team installed a Gree wall-mounted heat pump , perfectly suited to the energy needs of a family living in a renovated century-old house.
A strategic choice: the Gree wall-mounted heat pump
The wall-mounted heat pump remains one of the most popular solutions for urban homes in the Plateau, Rosemont, and Villeray areas. Compact, quiet, and highly efficient, the Gree range is distinguished by:
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Excellent energy efficiency, Energy Star certified, which opens the door to Quebec and federal subsidies (LogisVert, Greener Homes).
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An operating capacity down to -25°C , guaranteeing reliable heating even in the middle of Montreal winter.
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An efficient air conditioning mode in summer, maintaining a stable and pleasant temperature despite heat waves.
In this project, the installed unit offers a power of 12,000 BTU , an optimal choice for the living room and the open space on the ground floor.
Challenges encountered on site
Moving into an old house in Rosemont always has its own particularities:
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High ceiling height : the decorative plaster molding required precise positioning of the wall unit.
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Wall penetration : we carefully drilled and capped the refrigerant connections to ensure optimal sealing and discreet aesthetics.
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Condensate management : the flow was able to be achieved by gravity, avoiding the addition of a pump and simplifying future maintenance.
These technical constraints were anticipated by our installers in order to ensure both performance and aesthetic integration.
Installation process
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Site preparation : protection of walls and verification of the structure for solid anchoring.
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Indoor unit mounting : strategically positioned at the top of the living room wall to optimize air circulation.
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Drilling and running of conduits : installation of refrigerant pipes, electrical wiring and evacuation of condensates.
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Exterior capping : clean finish with white capping matching the rear facade.
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Start-up and calibration : performance tests, verification of pressures and programming of the remote control.
Everything was done in one full day , minimizing the impact on family routine.
Results obtained
Upon commissioning, the family immediately noticed:
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Consistent comfort in the living room and adjacent kitchen.
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Remarkable operational silence , allowing a peaceful atmosphere to be maintained.
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Predictable energy savings : according to our estimates, this wall-mounted heat pump will reduce your annual heating bill by approximately 25% compared to older electric convectors.
Why choose AirGreen for your projects in Montreal and its surrounding areas?
Our expertise in HVAC installation in Greater Montreal (Montreal, Laval, Longueuil, North Shore, South Shore) is based on three pillars:
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Certified and experienced technicians who understand the specific characteristics of local homes.
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Complete support in grant applications.
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Responsive and transparent after-sales service , with the possibility of annual maintenance to extend the lifespan of the devices.
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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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).