Installation of a Midea wall unit in Rosemont–La Petite-Patrie
AirGreen installed a Midea wall-mounted heat pump in Rosemont–La Petite-Patrie. Four-season comfort, extreme cold performance, and professional HVAC installation in Montreal and the surrounding area.
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The job on one screen
The article, chapter by chapter
Modern comfort adapted to a Montreal plex
At AirGreen , we carry out each wall-mounted heat pump installation with particular attention to the architectural context of Greater Montreal homes. In this project, we were called upon to work in a typical plex in the Rosemont–La Petite-Patrie neighborhood, where both the interior and exterior space impose specific technical constraints. The choice fell on a Midea wall-mounted heat pump from the recent range, perfectly suited to the heating and cooling needs of an urban home.
Why a Midea wall-mounted unit in this context?
Midea's new generation heat pumps, which run on R-32 or R-454B refrigerant, are renowned for their low-temperature performance, with some reaching temperatures as low as -30°C , a key requirement for Montreal. In this home, the owners were looking for:
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Stable comfort all year round , summer and winter.
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Reduced energy consumption thanks to inverter technology.
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A compact device that fits discreetly above the patio door, without disturbing the interior design.
Installation Challenges and Solutions
Installing in an urban plex requires dealing with several constraints:
1. Strategic positioning
The interior header was placed directly above the sliding patio door , an optimal location allowing for even air distribution throughout the room. This choice frees up the side walls for furnishings, while avoiding dead zones in air circulation.
2. Drilling and passage of connections
The refrigerant and electrical lines have been carefully routed to the rear, passing through the bulkhead leading to the courtyard. A discreet white trunking (capping) protects the pipes and ensures a clean and durable finish.
3. Condensate management
The drainage was carried out by gravity drain , made possible by the proximity of the patio door leading to the rear terrace. This avoids the addition of a condensate pump, thus reducing future maintenance and the risk of breakdown.
4. Climatic constraints
Montreal's climate requires protection against frost and snow accumulation. The outdoor condenser (not visible in the photo) was installed on a raised, unobstructed base, ensuring optimal air circulation and efficient drainage of defrost water.
Benefits for occupants
Thanks to this installation, residents now benefit from:
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Efficient heating even during the bitter cold of January.
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Pleasantly cool in summer , despite the accommodation's south-facing orientation.
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A reduction in energy bills , compared to traditional electric heating.
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A system eligible for provincial and federal subsidies , particularly under programs targeting high-efficiency Energy Star appliances.
AirGreen Expertise in Rosemont
This project perfectly illustrates our ability to adapt each installation to the realities of Montreal's built environment. Brick plexes in Rosemont–La Petite-Patrie often have restricted access and architectural features (narrow balconies, spiral exterior staircases, enclosed courtyards). Our technicians, accustomed to this type of configuration, carefully plan each step to reduce delays and minimize the impact on the occupants' daily lives.
Practical advice for plex owners
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Choose models certified for extreme cold (down to -25°C or -30°C).
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Check the possible routes for the drain : gravity preferably, otherwise integrated pump.
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Ensure the correct outdoor installation height to avoid snow-related problems.
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Consider available grants that can ease the cost of acquisition.
Conclusion
With this Midea wall-mounted heat pump installation in Rosemont , AirGreen once again demonstrates its expertise in integrating high-performance, discreet, and sustainable HVAC systems. For each project, we adapt our approach so that our clients enjoy the best of modern comfort, while respecting Montreal's architecture and climate.
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).