Installation of a Gree wall-mounted heat pump in Rosemont–La Petite-Patrie
Professional installation of Gree wall-mounted heat pumps in Montreal (Rosemont). AirGreen carries out your high-rise HVAC projects, with performance and subsidies, in Montreal, Laval, Longueuil, North Shore and South Shore.
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A complex HVAC installation high up on a brick facade
In the Rosemont–La Petite-Patrie neighborhood of Montreal , we recently completed the installation of a Gree wall-mounted heat pump in a typical red brick plex. This project perfectly illustrates our team's ability to work in demanding conditions, particularly at height, while respecting the strictest safety and performance standards.
The outdoor unit was installed directly on a small, narrow balcony, under a window, requiring the use of an extended ladder and safe techniques to maneuver the equipment without damaging the facade.
Why the Gree heat pump is a strategic choice in Montreal
Gree heat pumps are among the most popular systems in our residential installations in Greater Montreal. Their popularity is based on several advantages:
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Cold climate performance : designed to operate efficiently down to -25°C and sometimes -30°C depending on the range.
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Energy efficiency : Energy Star certification, helping to reduce electricity costs for heating and cooling.
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Durability : robust compressors and quality parts that withstand Quebec winters well.
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Grant eligibility : eligible for government programs such as LogisVert and Maison plus verte .
In this specific case, the owner wanted to take advantage of these benefits to replace an aging electric heating system and reduce his annual energy bill.
Technical challenges and tailor-made solutions
The installation presented several unique challenges:
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Working at height : the balcony was located approximately 4 meters above the ground, which required strict safety management.
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Restricted access : The brick facade and window position limited the unit's placement options.
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Robust fixing : to avoid any vibration and guarantee the longevity of the installation, we have used a reinforced metal wall bracket suitable for masonry facades.
Our team carefully planned the routing of the refrigeration pipes and electrical wiring , incorporating neutral-colored protective capping for a discreet and aesthetic finish. Condensate drainage was optimized by gravity to avoid any risk of water accumulation or freezing in winter.
Result: comfort guaranteed all year round
Thanks to this installation, the customer now benefits from stable thermal comfort throughout the year: efficient heating in winter and effective air conditioning in summer. The unit operates silently, which is particularly appreciated in a dense residential area like Rosemont.
This achievement confirms once again that, at AirGreen , we know how to combine technical expertise, safety and energy efficiency , even in the most complex conditions.
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).