A MIDEA 28 installed in a narrow outdoor space: the positioning of the outdoor unit made all the difference
In Otterburn Park, in the Montérégie region, we completed this MIDEA 28 dual-zone heat pump installation with a specific goal: to serve two indoor spaces from a single outdoor unit while properly integrating the equipment into a fairly restricted outdoor area.
The job-site photo shows a situation we regularly encounter in HVAC installation: the best available location for a heat pump is not necessarily a large, completely unobstructed wall. Here, the MIDEA outdoor unit is positioned between two masonry walls in a relatively narrow passage. We therefore paid particular attention to its orientation, support, and the accessibility of the connections.
The condenser was not simply placed on the ground. We installed it on a raised wall-mounted metal bracket secured to the masonry. This configuration helps keep the unit above the outdoor surface and creates a much more organized installation in this limited space.
For a heat pump used in Quebec, this type of detail matters. In Otterburn Park, as well as in Montreal, Laval, Longueuil, the North Shore, and the South Shore, a proper installation depends on more than just the performance figures listed in a brochure. The positioning of the outdoor unit, airflow, piping layout, accessibility for HVAC maintenance, and sizing of the two zones are all part of the same project.
Why use a MIDEA 28 heat pump in a dual-zone configuration?
A dual-zone heat pump uses a single outdoor unit to power two indoor units. Each indoor unit serves its own space and has its own controls.
MIDEA precisely describes the multi-zone principle: one outdoor unit can be connected to several indoor units to heat or cool multiple rooms, and each indoor unit can be adjusted individually according to the desired temperature.
In a home, this architecture becomes particularly interesting when the two spaces have different needs.
A highly windowed living area can warm up quickly in the sun while a bedroom on the other side of the property remains cooler. Conversely, in the evening, it may be unnecessary to maintain exactly the same demand in every room.
With two zones, we can adapt operation to the spaces being served rather than treating the entire house as one large room.
MIDEA documentation also specifies that individual control allows only the zones in use to be heated or cooled, rather than the entire property continuously.
A single outdoor unit instead of two condensers
The first visible advantage of this installation in Otterburn Park is very concrete: a single MIDEA outdoor unit serves both zones.
This is particularly useful when the space available around a house is limited.
Installing two single systems could potentially have required two outdoor locations, two sets of supports, and more space around the building. MIDEA also identifies reducing the outdoor space required and the number of noise sources as one of the advantages of a multi-zone configuration.
In this installation, this principle is especially meaningful because the outdoor unit is placed in a narrow area between two brick walls.
An important detail in the photo: the unit is elevated
We can clearly see that the condenser rests on a metal structure attached to the building rather than directly on the ground.
This choice offers several benefits for a heat pump installation in Quebec.
First, it creates a stable base without relying on the condition of the small surface beneath the unit. In the photo, the ground is uneven and relatively close to the masonry. The support therefore provides a separate, structured platform for the machine.
This height also facilitates management of the unit’s immediate surroundings. In winter, an outdoor heat pump unit must continue exchanging air and carrying out its operating and defrost cycles. We therefore avoid treating the outdoor positioning as a mere aesthetic detail.
The support must be part of the design
It would be easy to choose a heat pump based on its BTU capacity and only consider its location on the day of the installation.
We work in reverse order.
Before installation, we assess in particular:
- available surface area;
- the type of wall;
- fan orientation;
- the refrigerant-line route;
- access to the connections;
- installation height;
- permanent obstacles;
- future maintenance and cleaning options.
Even the best machine can become much more difficult to maintain and operate properly if it is poorly positioned.
A narrow passage that requires proper fan orientation
The MIDEA outdoor unit visible in the photo is installed near a brick wall on its right side and a second wall on its left.
The fan, meanwhile, is directed toward the open section of the passage.
This is an essential detail.
An air-to-air heat pump must absorb energy from outdoor air in heating mode and reject heat in cooling mode. It is therefore important to avoid unnecessarily creating a situation in which the air discharged by the unit is immediately trapped in front of it.
For this project, we used the available geometry to keep the discharge side facing the open space.
MIDEA 28: a platform designed for multiple indoor-unit combinations
The term MIDEA 28 refers here to a particularly flexible multi-zone platform. MIDEA documentation presents several categories of indoor units compatible with the multi-zone family: wall-mounted units, consoles, cassettes, ducted units, and air-handling units.
The range includes seven types of indoor units and several models, allowing systems to be configured according to the building’s architecture and needs.
This flexibility is important in our work at AirGreen.
A dual-zone configuration does not necessarily mean that both rooms must have exactly the same capacity or the same type of indoor unit. The choice depends on the calculations and how the spaces are used.
The documentation provides, for example, wall-mounted capacities ranging from small units intended for more modest spaces to equipment with significantly higher capacities. MIDEA combination tables provide for numerous indoor-unit pairings.
Inverter technology is particularly relevant with two zones
The MIDEA multi-zone system uses inverter technology that adjusts operating capacity as requirements change.
The manufacturer explains that the system modulates capacity by controlling, among other things, the compressor and fan motors. When all rooms do not simultaneously require full capacity, the unit can operate at partial load.
In a dual-zone installation like the one in Otterburn Park, this accurately reflects how a house actually operates.
The two zones do not always require exactly the same thing at the same time.
One zone may be approaching its setpoint while the second continues to call for heat. At another time, only one part of the property may need a temperature adjustment.
This is precisely the kind of variable operation for which a multi-zone inverter system is useful.
MIDEA 28 and energy efficiency: using the right data
The performance of a multi-zone system must always be interpreted accurately.
For example, the MIDEA brochure presents an Extreme Heat outdoor unit, MO4HX-H27B-2A, rated at 27,000 BTU. In the reference combination specified by the manufacturer, this system has a rated capacity of 27,000 BTU/h for cooling and 27,000 BTU/h for heating, a SEER2 of 23, an EER2 of 12.5, and a seasonal heating efficiency rating listed as 10.5 in the table.
However, one important point must be clarified: these figures correspond to the reference AHRI combination shown in the document, and not automatically to all dual-zone configurations using an outdoor unit from the same family.
We therefore never present a SEER2 rating or an AHRI number as belonging to a particular installation without verifying the exact numbers of the associated indoor and outdoor units.
This is particularly important when a homeowner wants to compare:
- two MIDEA heat pumps;
- projected electricity savings;
- ENERGY STAR criteria;
- available financial incentives;
- different HVAC contractor quotes.
A common mistake with multi-zone heat pumps: adding the BTUs without checking the combination
Suppose a property has one 12,000 BTU indoor unit and a second 18,000 BTU indoor unit.
It may be tempting to conclude that all you need to do is add 12,000 + 18,000 and choose the condenser based solely on that total.
A multi-zone system requires a more precise analysis.
MIDEA publishes specific combination rules for different compatible outdoor and indoor units. The brochure also states that if the total load of the indoor units exceeds the outdoor unit's rated capacity, the capacity actually available to the different units may be reduced, especially in heating mode.
That is why we consider the following simultaneously:
- the heating requirements of each room;
- the indoor units' capacities;
- the outdoor unit's capacity;
- the combination authorized by MIDEA;
- the likelihood that both zones will operate at high capacity at the same time;
- winter conditions.
A properly selected multi-zone heat pump is not simply an assembly of capacity figures.
SynchroConnect: an interesting feature during connection
The range presented in the MIDEA documentation also includes SynchroConnect technology.
Depending on the manufacturer, the system can diagnose the status of the connections after the cables and refrigeration lines have been connected. It can also synchronize the corresponding refrigeration and electrical circuits in the intended configurations.
For the owner, this function remains largely invisible after installation.
For our technicians, it is one of the technical elements that facilitates the configuration and verification of a system comprising several indoor units.
What we check on a dual-zone installation before commissioning
A professional HVAC installation does not end when the condenser is mounted on the wall.
Refrigeration connections
Each zone requires its own circuit to be properly connected to the outdoor unit. We must comply with the diameters, lengths, and conditions established for the installed combination.
Circuit tightness
The refrigeration circuit must be prepared correctly before commissioning. An improper connection or moisture in a circuit can compromise performance and long-term reliability.
Indoor unit drainage
In air conditioning, indoor units produce condensate. Its drainage must be planned to prevent leaks and water backflow.
Wiring and communication
In a multi-zone system, the units must not only receive the necessary power, but also communicate properly with the outdoor unit.
How each zone operates
We check both zones separately and together to confirm that the controls correspond to the correct units and that the system is responding normally.
Why future accessibility matters as much as the initial installation
The photo of this MIDEA in Otterburn Park illustrates another important principle of our work: a heat pump will need to be serviced after installation.
We therefore avoid creating, as much as possible, a situation in which a technician could no longer properly access the connections or service panels.
The outdoor unit is close to the walls here, but its front, fan, and several areas needed for servicing remain visible and accessible from the passageway.
In the long term, this planning notably simplifies:
- cleaning the heat exchanger;
- the general inspection;
- checking the connections;
- diagnosing a potential breakdown;
- heat pump maintenance work.
Financial assistance must be verified using the exact combination
Homeowners in Montréal, Laval, Longueuil, the North Shore, and the South Shore regularly ask us whether a MIDEA heat pump qualifies for the assistance programs available in Quebec.
For a multi-zone heat pump, the right approach is to verify the complete installed combination.
A brand or product-line name is not enough.
The outdoor unit, indoor units, and corresponding certification must be reviewed together. The brochure also lists several different AHRI numbers depending on the models and on whether the connected units are wall-mounted or ducted. For example, the reference combination for the Extreme Heat 27,000 BTU model with non-ducted units bears the number AHRI 215471460, while other configurations have their own references.
We therefore prefer to confirm eligibility based on the actual combination sold rather than promise a rebate based solely on the name “MIDEA 28.”
This Otterburn Park project clearly illustrates how we work
This project does not stand out at first glance because of an enormous or complex outdoor installation.
Its difficulty lay elsewhere: properly fitting a dual-zone heat pump into a restricted physical space between two masonry walls, while maintaining proper orientation and a structured installation.
The elevated metal bracket, the fan’s orientation toward the open space, and concentrating two zones on a single outdoor unit collectively address this constraint.
That is exactly what we look for at AirGreen.
We do not consider the heat pump an independent appliance that is simply mounted on a wall. We consider the entire system:
the house, the two zones, the outdoor unit, the masonry, airflow, refrigerant lines, drainage, electrical connections, maintenance access, and the occupants' daily use.
This approach applies equally to a dual-zone heat pump in Otterburn Park and to our installations in Montreal, Laval, Longueuil, the South Shore, and the North Shore.
When is a MIDEA 28 dual-zone system particularly worthwhile?
A configuration of this type is worth considering when a property has two distinct comfort zones and the goal is to limit the number of outdoor units.
It may be particularly suitable for:
- a ground floor and an upper floor;
- two distant bedrooms;
- an open-concept area and a bedroom;
- a house with an addition;
- a main living area accompanied by an office;
- two zones with different solar exposures;
- a property with limited outdoor space.
The final choice should nevertheless be based on the building's thermal loads and characteristics.
There are situations where two simple systems are preferable, and others where a central or ducted system will provide better distribution.
Our role is to determine which configuration is truly suitable for the building rather than proposing the same solution for every property.
AirGreen: Multi-zone heat pump installation in Greater Montreal
This MIDEA 28 dual-zone installation in Otterburn Park demonstrates that a good HVAC project often comes down to details that are barely noticeable once the work is complete.
The outdoor unit is compactly integrated into its surroundings, installed on a dedicated structure, and positioned to serve two zones from a single machine.
For homeowners comparing a MIDEA heat pump, a dual-zone heat pump, or a multi-zone system in Montreal, Laval, Longueuil, the North Shore, or the South Shore, we can assess the required capacity, compatible combinations, unit placement, and building-specific constraints before installation.
Good technical selection and thoughtful installation should always go hand in hand.