A multi-zone installation that required running the lines up to the upper floor without compromising the exterior finish
In Sainte-Brigide-d’Iberville, we installed a MIDEA 28 triple-zone heat pump in a brick residence where the true difficulty of the project lay as much in routing the lines as in selecting the equipment. The photo taken during the work clearly shows the reality of the job site: an outdoor MIDEA unit installed on wall brackets, several line-cover routes across the masonry, and work at height to reach the different zones of the house.
This configuration is precisely the kind of project for which a multi-zone heat pump takes on its full meaning. Rather than installing three different outdoor units around the property, we can power several indoor units from a single outdoor heat pump and manage the comfort of each space separately.
MIDEA describes its multi-zone principle in the same way: a single outdoor unit can be connected to several indoor units, each of which can be controlled and adjusted according to the desired temperature in its room.
On this Sainte-Brigide-d’Iberville home, the apparent simplicity of the final result therefore conceals a much more technical installation: three zones, several refrigerant line lengths, significant height differences, and a brick façade that had to be penetrated and properly routed around.
What the photo reveals about the true complexity of this HVAC installation
The construction photo immediately shows several technical decisions made by our AirGreen team.
The outdoor unit is installed on a metal wall bracketis also visible, at a certain height above the ground. This choice notably keeps the unit clear of the ground surface and preserves accessible space beneath the outdoor unit.
A network of white line covers which runs up the façade and branches off according to the zones to be served. Part of the route reaches the upper floor, requiring the use of a large ladder and precise work near the roof and gutters.
In a triple-zone installation like this one, it is not enough to find the shortest route. We must plan simultaneously:
- the length of the refrigerant lines;
- the communication wiring route;
- condensate drainage;
- changes in direction;
- the height differences between the outdoor unit and the indoor units;
- the location of the openings in the masonry;
- accessibility for future HVAC maintenance;
- the mechanical protection of the lines;
- the appearance of the installation once the work is complete.
On a highly visible brick wall, finishing details become particularly important.
Why we use line covers rather than leaving the lines exposed
The long white moldings visible in the photo are not decorative. They protect and organize the various connections required for the operation of the three-zone heat pump.
A multi-zone route includes several pairs of refrigerant lines. Without adequate protection, the exterior of a residence can quickly end up with a collection of exposed pipes, insulation, and cables.
We therefore favor an installation in which the routes follow the building's architectural lines as much as possible.
Here, the line covers were positioned vertically and horizontally to follow the facade and changes in elevation. This type of work takes more time than simply attaching the lines to the wall, but the result is significantly cleaner and also protects the components from impacts and weather.
An additional challenge: reaching an area near the upper floor
The upper part of the photo is particularly interesting.
One of the connections must rise close to the cornice. This involves not only working at height, but also carefully controlling the routing so as not to interfere with the soffit, gutter, or other elements of the building envelope.
We must also take into account the bending radius of the refrigerant lines. A refrigeration line cannot be bent sharply to follow an aesthetic angle. Changes in direction must remain compatible with the mechanical properties of copper and the manufacturer's installation recommendations.
The final routing is therefore always a compromise between technical efficiency, protection, accessibility, and appearance.
The MIDEA 28: a multi-zone platform designed to distribute comfort
The main advantage of a MIDEA multi-zone system is the ability to treat several rooms with a single outdoor unit.
The manufacturer's documentation notably highlights individual control of each indoor unit. This makes it possible to heat or cool occupied spaces without necessarily treating the entire house with the same intensity.
For a residence with several bedrooms, spaces spread across different floors, or rooms with different thermal loads, this approach is particularly relevant.
In this installation Sainte-Brigide-d’Iberville, the three-zone configuration makes it possible to create three distinct treatment points while retaining a single outdoor heat pump.
An inverter technology that modulates rather than operating only at full capacity
Another important feature of the MIDEA 28 is its technology inverter.
According to MIDEA documentation, the system adjusts its capacity as conditions change by modulating the operation of the compressor and fans. When all rooms do not simultaneously require full capacity, the system can operate at partial load and reduce its energy consumption.
In a three-zone home, this is an essential feature.
The needs of the ground floor and upper floor are generally not identical at the same time. A bedroom exposed to the sun may need more cooling toward the end of the day, while another zone may have already reached its setpoint.
The system must therefore be able to adapt rather than treat the three zones as one large space.
Interesting technical data on the MIDEA 28 Extreme Heat platform
MIDEA documentation presents, for the Extreme Heat unit rated at approximately 27,000 BTU/h, the outdoor unit MO4HX-H27B-2A. In the manufacturer’s published reference combination, it is associated with AHRI reference 215471460.
The published data for this combination include:
- power supply 208/230 V, single-phase, 60 Hz;
- rated capacity of 27,000 BTU/h in cooling;
- rated capacity of 27,000 BTU/h in heating;
- SEER2 of 23;
- EER2 of 12.5;
- HSPF4 of 10.5;
- published heating capacity of 27,000 BTU/h at 5°F, or approximately -15°C;
- indicated outdoor sound level of 61 dB(A).
However, one important clarification is needed: AHRI values are tied to a specific combination of outdoor and indoor units. Reference 215471460 in the brochure corresponds to the certification combination illustrated by MIDEA; it should not automatically be assigned to any triple-zone configuration.
For a rebate application or official verification, we always verify the combination that was actually installed.
A compact outdoor unit despite three zones to supply
In the project photo, the outdoor unit appears relatively compact compared with the size of the system it serves.
The MIDEA brochure lists the approximate dimensions of the outdoor unit in this category as 37 1/4 in. wide, 16 1/8 in. deep, and 31 7/8 in. high in the published configuration.
This compact design is an advantage on properties where the space available around the house is limited.
Instead of having three condensers lined up against the wall, we can group the needs of several zones around a single outdoor unit.
Why did we install the unit on wall brackets?
The outdoor unit location is always carefully considered before work begins.
For this project, the heat pump is mounted to the foundation wall using sturdy metal brackets.
This configuration offers several practical advantages:
Clearance from the ground
By keeping the outdoor unit elevated, we reduce its direct exposure to certain accumulations at ground level and make access around the unit easier.
A location compatible with all three routes
The chosen position allows the different pipes to run toward the relevant zones without creating an unnecessarily complicated network.
Better façade organization
In the photo, the outdoor unit is located in the lower part of the façade, while the pipes run vertically upward to the different levels. This allows us to create a logical system rather than several independent routes scattered across the wall.
A three-zone system requires proper sizing
One of the most common pitfalls when a homeowner compares multi-zone heat pumps is simply adding together the rated capacities of the indoor units.
This is not how a system should be evaluated.
MIDEA specifies in its combination guidelines that if the total load of the indoor units exceeds the outdoor unit’s rated capacity, the capacity actually available to each one may be reduced. The manufacturer indicates that this effect becomes particularly noticeable in heating mode.
To design a three-zone installation, we must therefore analyze the needs of each space:
- floor area;
- orientation;
- amount of glazing;
- insulation level;
- floor;
- solar exposure;
- ceiling height;
- room usage;
- heating load in winter;
- the possibility that several zones may require their full capacity simultaneously.
A larger unit is not automatically better. A well-chosen combination is much more important.
This project in Sainte-Brigide-d’Iberville illustrates the details that distinguish a quick installation from a well-planned one
A HVAC installation A successful installation is difficult to judge simply by looking at the condenser once it is running. Several decisive elements are found in the details: the route taken by the pipes, how they are protected, the location of the wall penetrations, the drainage slopes, the outdoor unit support, and the quality of the commissioning.
This HVAC installation MIDEA 28 three-zone heat pump in Sainte-Brigide-d’Iberville is a good example because the project required an unusual layout.
One zone was relatively accessible from the lower level, while another required a much higher route along the building. We then had to group all these connections toward a single outdoor unit.
The mistakes we specifically aim to avoid on this type of project
Adding more exposed piping
A poorly planned three-zone installation can quickly turn a façade into a network of pipes. We aim to group the lines together and use suitable line-hide covers.
Choose the route based solely on length
The shortest route is not always the best. It can create drainage problems, obstruct a window, or complicate maintenance.
Excessively bending the lines at the corners
Changes in direction must comply with the specifications for the refrigerant lines. A neat exterior finish must never come at the expense of technical reliability.
Installing the outdoor unit too close to an obstacle
The fan and heat exchanger must have the necessary clearances to ensure adequate airflow.
Neglecting snow and water around the unit
A heat pump used for heating in Quebec produces water during defrost cycles. The unit’s location must account for this reality.
Choosing the three heads without verifying the MIDEA combination
The manufacturer publishes precise combination rules for its multi-zone systems. We verify them before considering a configuration appropriate.
SynchroConnect: a feature particularly relevant to a system with multiple connections
On a triple-zone installation, it is essential that each refrigerant line correspond to the correct indoor unit and the correct wiring.
MIDEA incorporates a technology called SynchroConnect. The manufacturer states that the system can diagnose connections between the units and synchronize the refrigerant lines with the corresponding electrical connections in certain situations.
This feature is particularly useful on a multi-zone installation where several sets of lines reach the same condenser.
However, it does not replace good installation practices: identifying the lines, making the correct connections, pulling a vacuum, checking the electrical system, and individually testing each zone.
And what rebates are available for this MIDEA 28?
For homeowners in Montreal, Laval, Longueuil, the North Shore, the South Shore, and Montérégie, rebates are often an important factor when comparing heat pumps.
A MIDEA 28 may be found in combinations with AHRI references and interesting efficiency ratings. The brochure specifically presents the reference AHRI 215471460 for a specific combination using the 27,000 BTU/h Extreme Heat platform.
However, eligibility for financial assistance should never be determined solely from the name “MIDEA 28.”
The following must be verified:
- the exact outdoor unit model;
- the indoor unit models;
- their combination;
- the AHRI reference corresponding to this combination;
- the program criteria in effect;
- the building type;
- the requirements applicable on the date of the work.
At AirGreen, we prefer to verify this information precisely rather than announce a rebate that might apply to a different combination.
A single outdoor unit for truly distributed comfort throughout the home
This is probably the main visible advantage of this project.
Despite serving three zones, the home retains a single MIDEA outdoor unit.
The manufacturer’s documentation specifically highlights that a multi-zone system can save outdoor space and reduce the multiplication of noise sources by connecting several indoor units to a single outdoor unit.
For this Sainte-Brigide-d’Iberville residence, this approach provides a much more cohesive solution than installing several independent systems.
Our AirGreen approach for multi-zone projects in Montreal and Greater Montreal
We regularly carry out installations of heat pumps, of wall-mounted air conditioners and multi-zone systems in Montreal, Laval, Longueuil, on the North Shore and the South Shore, as well as in several municipalities in the Montérégie region.
However, every project has its own constraints.
In Sainte-Brigide-d’Iberville, the main challenge was the height and routing of the lines along a brick façade. On another job, the difficulty may be a very limited space between two buildings. In a Laval home, it may involve positioning an indoor unit above a door. In Longueuil, we may need to work around a balcony or preserve a side passage. In Montreal, the constraints may involve a shared wall or an especially narrow yard.
Our job is to adapt the design to the property, rather than impose exactly the same installation layout on every customer.
The result: three zones, an organized façade, and a heat pump ready for Quebec’s seasons
This project involving MIDEA 28 triple-zone heat pump in Sainte-Brigide-d’Iberville shows why the quality of a multi-zone installation lies as much in the planning as in the equipment itself.
The outdoor unit was installed high on a metal structure, the various lines were grouped together and protected with white line covers, and part of the work required working at heights to reach the upper-floor areas.
The result makes it possible to heat and cool several spaces using a single outdoor system while maintaining a clean installation on the brick façade.
For a homeowner comparing a triple-zone heat pump in Montreal, Laval, Longueuil, on the North Shore or the South ShoreThis installation mainly serves as a reminder of one thing: choosing the model is only the beginning. Sizing, combining the units, routing the lines, and the quality of the on-site work will determine the system’s actual comfort for many years.