Installation of a MIDEA MIDEA28 dual-zone heat pump in Nuns' Island with 2 indoor heads and 1 outdoor unit on the roof
AirGreen installs a MIDEA MIDEA28 dual-zone heat pump in Île-des-Sœurs: 2 indoor units, 1 outdoor unit on the roof, clean finish, and an HVAC solution adapted to Greater Montreal.
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A Rooftop HVAC Installation Where Every Detail Counts
In Île-des-Sœurs, dual-zone heat pump installations require a particularly rigorous approach. Between constraints on roof access, membrane protection, refrigerant line management, and the need to preserve building aesthetics, every step must be meticulously planned. For this project, our AirGreen team installed a MIDEA MIDEA28 dual-zone heat pump, consisting of two indoor heads connected to one outdoor unit positioned on a flat roof.
This type of HVAC installation is highly sought after in Montreal, particularly in areas like Île-des-Sœurs, where condos, residential buildings, and high-rise units demand compact, quiet, and efficient solutions. The choice of a MIDEA28 system proved particularly relevant for providing stable comfort in two distinct zones of the dwelling, while minimizing outdoor clutter thanks to a single machine on the roof.
Why a dual-zone heat pump was the right choice
The client wanted to improve the comfort of two separate spaces without multiplying outdoor equipment. A dual-zone heat pump allows for independent control of two rooms or two areas of the dwelling with a single outdoor unit. This is a highly valued solution in condos and residential units in Montreal, Laval, Longueuil, the North Shore, and the South Shore, especially when outdoor space is limited.
In this project, the objective was clear: to achieve efficient heating and air conditioning in two zones, without compromising the roof, without creating a cluttered installation, and without multiplying penetrations. The chosen configuration allows for better comfort management, as each indoor head can operate according to the actual needs of the room it serves.
An outdoor unit installed on the roof: stability, clearance, and protection
The project image shows an outdoor unit installed on an elevated support, resting on bases designed to distribute the load and prevent any damaging direct contact with the roof membrane. This step is essential. On a flat roof, a poor installation can lead to vibrations, premature wear of the membrane, poor drainage, or access problems during maintenance.
At AirGreen, we pay particular attention to three elements during a rooftop heat pump installation:
- the mechanical stability of the outdoor unit;
- the protection of the roof membrane;
- the necessary clearance for HVAC maintenance and airflow.
In this specific case, the MIDEA unit was installed on a well-cleared structure, allowing for good ventilation around the outdoor coil. The positioning also facilitates future service interventions, a detail often overlooked during quick or poorly planned installations.
Refrigerant line management: a clean and secure passage
One of the most visible aspects of this installation is the passage of lines between the roof and the outdoor unit. The conduits were grouped and protected to limit unnecessary exposure, reduce the risk of wear, and maintain a professional appearance. On a roof, refrigerant lines are exposed to wind, temperature variations, UV rays, snow, and building maintenance interventions.
A durable installation is not simply about connecting a machine. It's about anticipating the system's behavior over several years. The conduits must be properly supported, avoid excessive tension, respect recommended bend radii, and remain accessible if a diagnosis becomes necessary.
This rigor is particularly important for projects in Île-des-Sœurs, where technical access can be more complex than in a classic single-family home. In buildings with shared roofs, every passage must be carefully considered to reduce risks and preserve the building's integrity.
MIDEA MIDEA28: a powerful solution for two comfort zones
The MIDEA28 model is often chosen for residential projects where the client wants to combine performance, versatility, and good value for money. In a dual-zone configuration, it can serve two indoor heads with a single outdoor unit, which simplifies layout and reduces the visual impact on the building.
Concrete benefits for the owner
For an owner or property manager, a MIDEA dual-zone heat pump offers several practical benefits:
- independent control of two zones;
- reduction in the number of outdoor units;
- improved heating and air conditioning comfort;
- more flexible operation according to room occupancy;
- solution adapted for condos and urban dwellings;
- more discreet rooftop installation.
In an area like Île-des-Sœurs, where outdoor space is often limited and co-ownership rules can be strict, these advantages become crucial. A single, well-positioned outdoor unit can meet the dwelling's needs without visually cluttering the roof or façade.
An installation designed for Montreal's climate
Montreal's climate imposes real demands on HVAC systems. In summer, hot and humid periods require efficient air conditioning. In winter, cold temperatures demand reliable heating capacity. A well-chosen and properly installed heat pump can reduce reliance on more energy-intensive heating systems, while improving daily comfort.
The quality of the installation directly influences performance. Even an excellent appliance can lose efficiency if the lines are poorly sized, if the outdoor unit lacks clearance, if drainage is poorly planned, or if the supports transmit too many vibrations. This is why our approach relies as much on model selection as on technical execution on site.
Specific challenges of an Île-des-Sœurs installation
This project presented several challenges typical of installations in densely populated urban environments:
Roof access
Roof access must be carefully coordinated. Equipment, tools, supports, and materials must be transported without damaging common areas or compromising team safety. An outdoor heat pump is not a simple lightweight appliance; its movement requires method and preparation.
Membrane protection
On a flat roof, the membrane is a critical element of the building. We avoid inadequate direct support and use support methods that distribute the load. The goal is to keep the unit stable while reducing the risk of puncturing, abrasion, or water accumulation around the base.
Line routing
The path of the refrigerant lines must be clean, logical, and durable. In this project, the lines were routed to the outdoor unit maintaining clear organization. This care facilitates future inspections and reduces the risk of accidental damage.
Visual discretion
Even on a roof, appearance matters. An orderly installation inspires confidence and reflects the quality of the work performed. Conduits, supports, and cables must be installed with a professional finish, especially in a residential building where co-owners and managers may inspect the work.
Mistakes to avoid with a dual-zone heat pump
A dual-zone heat pump can deliver excellent results, but certain mistakes can reduce its performance or lifespan.
Choosing an unsuitable capacity
A system that is too weak will run too long without achieving the desired comfort. A system that is too strong can cause short cycling, less controlled humidity, and premature wear. Evaluating the actual needs of the two zones is therefore essential.
Neglecting line length
The distances between the indoor heads and the outdoor unit must comply with the manufacturer's technical limits. Poor planning can complicate installation, reduce efficiency, or create operational problems.
Installing the outdoor unit without sufficient clearance
The outdoor coil needs to breathe. On a roof, it can be tempting to place the unit in a discreet corner, but a lack of space around the machine reduces performance and makes maintenance more difficult.
Forgetting future maintenance
A good installation must be designed for today and for years to come. The technician must be able to access the unit, inspect connections, clean the coil, and check operation without having to disassemble part of the installation.
The AirGreen approach: precision, cleanliness, and long-term vision
At AirGreen, we know that a successful HVAC installation is not only measured at startup. It is also measured after a full winter, after several cooling cycles, after the first maintenance operations, and after several years of use.
For this project in Île-des-Sœurs, our team focused on:
- a stable outdoor installation on the roof;
- clean and consistent line routing;
- a configuration adapted to two indoor zones;
- a professional finish;
- an installation designed for future maintenance;
- a respectful integration into the building.
This method reflects our experience on similar projects in Montreal, Laval, Longueuil, on the North Shore, and the South Shore, where technical constraints vary greatly from one building to another. A condo in Île-des-Sœurs does not have the same requirements as a house in Brossard, a duplex in Rosemont, or a property in Laval. Each project requires a precise understanding of the location.
Zone Comfort: a daily advantage
The main advantage of a dual-zone system is felt daily. A sun-exposed room does not have the same needs as a cooler bedroom. An office used during the day does not have the same requirements as a bedroom used at night. With two indoor heads, the client can adjust each zone according to the actual use of the space.
This flexibility helps improve comfort, but also to better manage energy consumption. Rather than treating the entire dwelling uniformly, the system responds to the actual needs of the occupants. This is particularly useful in urban units where orientation, insulation, windows, and floor strongly influence indoor temperature.
Grants and eligibility: a point to check before installation
Grant programs can represent a significant advantage when purchasing a heat pump. However, eligibility depends on the exact model, configuration, applicable AHRI number, installed capacity, and criteria in effect at the time of the project.
Before an installation, AirGreen verifies available information to guide the client towards a solution compatible with their comfort objectives and, when possible, with applicable financial assistance programs. For a MIDEA MIDEA28 heat pump, it is important to confirm the precise details of the installed system, including the combination between the outdoor unit and the indoor heads.
Practical advice for condo owners
For owners in Île-des-Sœurs or elsewhere in Greater Montreal, here are some tips before planning a similar installation:
Validate co-ownership rules
Certain co-ownerships impose requirements on the location of outdoor units, working hours, type of support, line routing, or final appearance. These rules must be known before installation.
Plan technical access
A rooftop installation often requires coordination with the building administration. Access to mechanical spaces, stairwells, elevators, or the roof must be arranged in advance.
Do not choose solely based on price
Initial cost is important, but installation quality influences performance, noise, maintenance, and durability. A cheaper but poorly planned installation can cost more in the long run.
Request a clean finish
Lines, cables, supports, and connections must be installed with care. A professional finish protects the equipment and enhances the building.
A project that well illustrates urban HVAC needs
This MIDEA MIDEA28 dual-zone heat pump installation in Île-des-Sœurs perfectly represents the current needs of urban homeowners: zone comfort, energy efficiency, discreet integration, and durable installation. The outdoor unit on the roof frees up ground space and respects the reality of dense residential buildings, while offering a powerful solution for two indoor zones.
For AirGreen, every detail counts: unit placement, support stability, roof protection, duct routing, accessibility for maintenance, and customer satisfaction after commissioning. This comprehensive approach allows us to carry out reliable installations throughout Greater Montreal, from Montreal to Laval, from Longueuil to the North Shore, including the South Shore.
An installation ready for Montreal's seasons
A heat pump installed on a flat roof must withstand heat, cold, rain, snow, frost, and wind. Choosing the right equipment is important, but how it is installed is just as crucial. In this project, the MIDEA MIDEA28 system was integrated with particular attention to durability, future access, and actual performance.
For an owner who wants to cool and heat two zones without installing two outdoor units, the dual-zone heat pump remains a smart option. And when installed by an experienced team, it becomes a reliable, clean solution adapted to the concrete requirements of the building.
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).