Installation of a Midea wall-mounted heat pump on a flat roof in Rosemont–La Petite-Patrie
AirGreen installed a Midea wall-mounted heat pump on the flat roof of a plex in Rosemont–La Petite-Patrie, providing four-season comfort and a careful installation that respects the roof and the neighborhood.
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.
In Rosemont–La Petite-Patrie, more and more homeowners are looking for an efficient, quiet heating and cooling solution adapted to the realities of a typical Montreal flat-roofed building. It was precisely in this context that our AirGreen team stepped in to install a Midea wall-mounted heat pump on the roof of a residential duplex in the neighbourhood.
Thanks to careful installation on an elevated structure, this heat pump will now ensure 4-season comfort for the occupants, while protecting the roof and optimizing the performance of the equipment.
The context: a Montreal duplex and a flat gravel roof
The building is a residential apartment building, typical of Rosemont–La Petite-Patrie: urban facade, mature trees around, and a flat roof covered with gravel.
The client's needs were clear:
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Efficiently heat and cool the living space, summer and winter.
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Minimize noise for occupants and the neighborhood.
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Protect the roof membrane and avoid any localized overloading.
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Plan for a clean, uncluttered and easy-to-maintain installation.
We recommended a Midea wall-mounted heat pump , a recent high-performance range, perfectly suited to small and medium-sized homes in Greater Montreal.
Choosing the Midea wall-mounted heat pump
For this project, we opted for a Midea wall-mounted heat pump from the “Midea28” family , a series designed for Quebec winters, using a new generation refrigerant with a lower environmental impact.
Key benefits for the customer
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Four-season performance : reliable heating even at very low outside temperatures, ideal for Montreal's extreme cold.
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High energy efficiency : power modulation reduces consumption while maintaining stable comfort, without sudden temperature variations.
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Quiet operation : both for the indoor unit and the outdoor unit, which is essential in a dense area like Rosemont–La Petite-Patrie.
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Customized comfort : precise temperature control, night mode, efficient dehumidification in summer.
This type of device fits perfectly into an energy bill reduction strategy, particularly when it replaces or supplements a traditional electrical system.
A flat roof installation designed to last
The most visible element of this project is the Midea outdoor unit installed on the building's flat roof . On this type of building, the way the heat pump is installed makes all the difference between a standard installation and a professional one.
Elevated support structure
The outdoor unit is fixed to a raised metal support , itself installed on wooden beams resting on distribution blocks :
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The height helps keep the machine above the accumulation of snow and ice.
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The wooden beams act as an intermediary between the structure and the roof, distributing the load over a larger area.
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The blocks under the beams reduce point pressure and help protect the roof membrane .
This type of assembly is particularly suited to Montreal flat roofs, where the aim is to avoid any perforation of the membrane as much as possible.
Roof protection and vibration management
We paid particular attention to:
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Mechanical stability : the structure is perfectly leveled so that the compressor works without stress.
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Vibration management : the use of appropriate supports limits the transmission of vibrations to the building structure, thus reducing the noise felt inside.
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Respect for the membrane : no aggressive direct fixing into the roof; everything is designed to minimize the risk of long-term infiltration.
Optimized airflow and clearance
The Midea unit has sufficient clearance at the rear, front, and sides , which ensures:
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Excellent air circulation around the condenser.
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Optimized performance in both air conditioning and heating modes.
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A reduction in the risk of excessive frosting or overheating.
These clearances are essential to comply with the manufacturer's recommendations and ensure the longevity of the heat pump.
Neat refrigeration and electrical connections
The refrigeration lines and power supply are routed in an orderly manner into the building:
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The route was carefully planned to limit the length of the pipes, which improves the efficiency of the device.
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Solid and clean fixings, to reduce the risk of friction, pinching or premature wear.
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Watertight penetrations at roof level, in accordance with best practices in residential HVAC.
Indoor comfort and energy savings
Thanks to this Midea wall-mounted heat pump installed on the roof:
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Occupants enjoy stable comfort all year round , with a consistent temperature and well-dehumidified air in summer.
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Electricity consumption related to heating is reduced compared to electric baseboard heaters alone, resulting in significant annual savings.
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The system offers a rapid response : the room cools down or heats up in a short time.
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Quiet operation improves the quality of life, both inside and outside, in a dense neighbourhood like Rosemont–La Petite-Patrie.
For the owner, it is also an investment that increases the value of the building , offering modern comfort that is highly sought after on the rental market and for resale.
A project representative of our AirGreen expertise
This Midea wall-mounted heat pump installation on a flat roof in Rosemont–La Petite-Patrie perfectly illustrates our approach:
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Analysis of the building and the client's actual needs .
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Selection of a Midea model adapted to the Montreal climate and the configuration of the dwelling.
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Design of a custom installation respecting the existing roof, clearances and manufacturer's standards.
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Careful finishing for a durable, safe and easy-to-maintain installation.
At AirGreen, we support our clients throughout Greater Montreal – Montreal, Laval, North Shore, South Shore – to choose and install the heating and air conditioning solution that truly suits them.
Are you considering a Midea heat pump in Montreal?
Whether you own a multi-unit building like this one in Rosemont–La Petite-Patrie, or a single-family home in the suburbs, we can:
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Assess your heating and air conditioning needs.
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We can offer you the Midea range (including the Midea28 series) best suited to your situation.
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Design an installation that respects your building, your budget and our Quebec winters.
Contact us for a free quote and discover how a Midea wall-mounted heat pump can transform your comfort while reducing your energy bills.
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).