In Saint-Mathieu-de-Beloeil, a MIDEA28 installed on a narrow balcony without sacrificing access, aesthetics, or airflow
This MIDEA MIDEA28 dual-zone heat pump installation in Saint-Mathieu-de-Beloeil, on Montreal’s South Shore, clearly illustrates a reality that specification tables never show: in a multi-unit residential building, choosing a heat pump is only part of the work. Where we install the condenser, the routing of the refrigerant lines, the integration of the line-hide with the facade, and future access for maintenance are just as important.
The project photo makes the constraint immediately clear. We were working on a brick facade with a relatively narrow metal balcony, bordered by a guardrail and located near an exterior staircase. Several units and multiple mechanical installations are in the same environment. We therefore had to integrate the Midea outdoor unit into a defined space without turning the balcony into a cluttered mechanical area.
We also paid particular attention to the exterior routing of the connections. The brown line-hide follows the brick wall vertically, then turns horizontally above the opening. This choice creates a finish that is much more consistent with the tones of the masonry, guardrails, and existing architectural elements than a highly visible white conduit running across the entire facade.
That is exactly what we look for at AirGreen: a HVAC installation must be technically sound, but it must also look as though it was designed for the building.
An exterior constraint much more interesting than a simple open wall
Installing a condenser at ground level and installing the same unit on a balcony are two different projects.
On this Saint-Mathieu-de-Beloeil project, the guardrail, window, exterior staircase, brick wall, and available space required several checks even before we began making the connections. We had to consider the required clearance around the unit, the direction of the air discharge, vibrations, access to the service panel, and the future work of a technician.
The fan grille of the outdoor unit visible in the photo is oriented toward the open side of the balcony. This is an important detail in an installation of this kind: the air discharged by the condenser should not be unnecessarily trapped against the façade.
We must also think about what will happen in January, not just the aesthetic result on the day of installation. A heat pump used for heating produces water during its defrost cycles. On a balcony, this needs to be considered carefully to avoid unnecessarily creating ice in a traffic area.
The brown line-set cover: a small detail that completely changes the façade
One of the most visible elements of this installation is the routing of the refrigerant lines.
Rather than leaving the pipes, communication cable, and other connections exposed, we integrated them into a brown outdoor line-set cover, which blends much more harmoniously with the building's reddish-brown brick.
In the photo, this conduit rises vertically beside the opening and then continues horizontally above it. This geometry keeps the route organized while working around the building's existing elements.
A poorly planned wall-mounted installation can leave behind a succession of pipes, cables, and changes in direction that immediately become visible from the street or parking lot. In a multiplex, condo, or rental building, the aesthetic impact is multiplied because the façade is shared by several units.
We therefore treat the line routing as a true part of the HVAC installation, rather than something to improvise once the equipment has been installed.
Why a dual-zone heat pump makes particular sense here
A multi-zone heat pump makes it possible to connect several indoor units to a single outdoor condenser. Each indoor unit can then be adjusted separately according to the needs of the room or area being served. Midea documentation specifies that the indoor units can be controlled, programmed, and adjusted individually.
In a dual-zone configuration, this makes it possible, for example, to serve two areas with different needs: a living area and a bedroom, two floors, a front area and a rear area, or two sections with different solar loads.
The outdoor advantage is just as important on this project. A single condenser means less equipment on the balcony, less occupied space, and a much easier-to-organize facade.
Midea rightly emphasizes that grouping several indoor units around a single outdoor unit reduces the space required outdoors and limits the number of noise sources around the building.
MIDEA28: a much more flexible multi-zone platform than its name suggests
The name MIDEA28 refers to a range, not a single capacity of 28,000 BTU/h. This is an important distinction for a homeowner comparing quotes.
The product-range documentation lists multi-zone condensers with different capacities. It specifically indicates outdoor capacities of 18,000, 27,000, 36,000, 48,000, and 55,000 BTU/h, with options for up to three, four, five, or six zones depending on the model.
A dual-zone installation therefore does not automatically mean that a particular condenser must be selected. At AirGreen, we determine the capacity based on the actual needs of both spaces, the combination of indoor units authorized by Midea, and the building's heating load.
This is especially important in a building like the one visible in Saint-Mathieu-de-Beloeil. Two dwellings or rooms of similar size can respond very differently if one is on the top floor, has more windows, or receives much more sunlight.
Down to -30 °C, ENERGY STAR, and R-454B refrigerant
For the MIDEA28 wall-mounted series, Midea announces a platform using A2L R-454B refrigerant, Cold Climate V6.1 certification, ENERGY STAR certification for applicable configurations, and a heating range reaching -30 °C. Depending on the model and pairing, the range reaches up to 27.4 SEER2 and 13.5 HSPF2.
However, these maximum values should never be automatically transferred to just any dual-zone configuration. In a multi-zone system, the exact combination of condenser + indoor units determines the certified performance.
That is why we emphasize the AHRI reference number rather than relying solely on the equipment's commercial name.
Concrete performance examples from the MIDEA28 Extreme Heat family
The Midea brochure provides useful reference points for understanding the platform's capabilities.
For the reference combination using the condenser MO3HX-H18B-2A, the table indicates a power supply of 208/230 V, single-phase, 60 Hz, a rated capacity of 19,000 BTU/h for cooling and 20,000 BTU/h for heating, with 25 SEER2, 15 EER2, and 10.4 HSPF2.
For MO4HX-H27B-2A, the same table indicates 27,000 BTU/h for cooling and heating, 23 SEER2, 12.5 EER2, and 10.5 HSPF2 for the published reference combination.
The documentation associates MO4HX-H27B-2A with AHRI number 215471460 in its reference All Easy Pro combination.
These figures show why we should never state the SEER2 or HSPF2 of a two-zone system based solely on the condenser. The exact AHRI of the installed combination must be verified.
Oversizing a multi-zone system is not a safety strategy
A common mistake is to simply add the rated capacity of the two wall-mounted heads and assume that a larger outdoor unit will necessarily be better.
Midea documentation contains several pages of combination rules because the behavior of a multi-zone system depends on all the connected units. The manufacturer also specifies that when the total capacity of the indoor units exceeds the rated capacity of the outdoor unit, the capacity actually available to each unit may be reduced, particularly in heating mode.
We therefore prefer to analyze:
- the heating and cooling load of each zone;
- the minimum and maximum capacity of each indoor unit;
- the combination authorized by Midea;
- the available capacity at winter temperatures;
- the route and length of the refrigerant lines;
- electrical requirements;
- the outdoor location and defrosting options;
- the AHRI number corresponding to the final configuration.
This selection process is just as important as the quality of the installation itself.
Inverter technology is particularly useful in a two-zone system
A home almost never requires its maximum capacity throughout the entire day.
Midea's Inverter technology allows the system to adjust the compressor and fan capacity to temperature variations and the actual load. When all rooms do not simultaneously require full capacity, the system can operate at partial load rather than functioning solely according to an on-off logic.
In a dual-zone system, this modulation becomes very interesting. One zone may have reached its setpoint temperature while the other continues to call for heating or cooling.
Comfort thus becomes much more precise than with a solution that would systematically treat the entire dwelling in the same way.
A balcony heat pump installation where the technical details remain visible long after we leave
The quality of a heat pump installation in Saint-Mathieu-de-Beloeil is not judged solely on the day we start the system. It must remain practical for the owner, occupants, and technicians who may one day need to perform maintenance or diagnostics.
This is particularly true on a balcony like the one shown here.
Maintaining access to the outdoor unit
In a narrow space, it would be easy to push the condenser into a corner simply to regain a few inches of clearance. However, such a decision could make it harder to access the service panels or reduce the required clearances.
During our installations, we must therefore find a very precise balance between balcony use, condenser clearance, air discharge, and future maintenance.
The presence of an exterior metal staircase makes this consideration even more important. The installation must not become an unnecessary obstacle to daily movement or complicate access to the building's different sections.
Vibrations and noise take on another dimension in a multi-unit building
A condenser installed near a bedroom or on a structure connected to the building deserves particular attention.
An improperly stabilized outdoor unit can transmit more vibrations to its supporting surface. In a building with multiple dwellings, what may seem like a slight mechanical noise outside can become more noticeable indoors if the vibrations are transferred to the structure.
That is why we consider stability, support, clearances, and placement as a whole. The goal is not merely for the unit to stay in place: it must operate under conditions suited to its environment.
Another installation aid: SynchroConnect
A multi-zone system has several pairs of refrigerant lines and several communication cables. The more zones there are, the more important it becomes to maintain a clear correspondence between each circuit.
Midea integrates SynchroConnect technology into its multi-zone platform. According to the documentation, the system can diagnose the status of the connections between the units and the condenser and can synchronize the correspondence between the refrigerant lines and the wiring in certain connection situations.
This feature is an interesting tool during commissioning, but it obviously does not replace our work method: circuit identification, proper refrigerant connections, leak testing, evacuation, electrical validation, and a complete functional test.
LogisVert: a particularly relevant check for this type of building
The photo shows a typical architecture for a multi-unit building, with balconies and exterior staircases. This alone does not confirm the building's legal status or eligibility for a subsidy, but it makes checking Hydro-Québec programs particularly relevant.
Currently, the LogisVert program provides financial assistance of $120 per 1,000 BTU/h of heating capacity at -8 °C for an ENERGY STAR – Cold Climate-certified heat pump when all program conditions are met. The amount therefore depends on the capacity recognized at -8 °C, not simply on the number of BTUs indicated in the unit's commercial name.
For certain multi-unit buildings, an incentive available for installations completed since June 15, 2026, may bring the total assistance to $220 per 1,000 BTU/h at -8 °C.
However, this incentive has specific criteria. Hydro-Québec states in particular that the building must contain at least two dwelling units, have been built in 1995 or earlier, have one electricity meter per dwelling unit, have an assessed value per dwelling unit below the regional median, and be located in an eligible area determined by Hydro-Québec.
We therefore never consider a subsidy guaranteed before verifying the address, the building, and especially the exact AHRI combination of the heat pump.
A properly installed line set cover also makes future service work easier
A visible line set cover is not the only advantage of this installation.
A properly organized outdoor conduit protects the lines and makes their routing immediately understandable to a technician. When we return several years later for HVAC maintenance or a repair, a logical routing makes it much easier to identify the circuit.
On a brick building, it also helps avoid a visually cluttered accumulation of separate lines.
On this Saint-Mathieu-de-Beloeil project, the dark brown color is particularly well suited: the line set cover visually blends with the railings and the tones of the masonry rather than forming a highly contrasting white line across the entire facade.
This project sums up our approach at AirGreen well
A MIDEA28 dual-zone system has interesting technical features, but the best performance specifications cannot compensate for a poorly planned installation.
On this Saint-Mathieu-de-Beloeil project, the limited outdoor space required careful planning: condenser on the balcony, brick facade, railing, exterior staircase, proximity to the windows, and the vertical then horizontal routing of the connections.
Our job is to bring all these constraints together in a coherent solution.
We apply the same approach to our heat pump installations in Montreal, Laval, Longueuil, on the North Shore and on the South Shore: select the right capacity, verify the unit combination, optimize the refrigerant line routing, plan the drainage, meet the electrical requirements, preserve service access, and achieve a clean finish.
For an owner of a condo, duplex, multi-unit building, or house considering a Midea dual-zone heat pump, the building analysis should always come before the final equipment selection. Two installations bearing exactly the same model name may require completely different strategies depending on the architecture.
At AirGreen, this is precisely the part of the work that interests us: adapting the HVAC system to the actual building, rather than forcing the building to adapt to a standard installation.