Installation of a MIDEA 28 dual-zone heat pump in Beloeil

In Beloeil, commissioning did not end when the wall-mounted unit started blowing air

A dual-zone heat pump installation is not judged solely by the quality of the connections or the final appearance of the units. In Beloeil, this MIDEA 28 system installation illustrates a step we consider essential at AirGreen: verifying the equipment’s actual operation once the system has started.

The photo taken on site shows one of the MIDEA wall-mounted units operating while a technician checks the temperature with an infrared measuring device. This detail is important. A heat pump may start, respond to the remote control, and produce airflow without that being enough to confirm that the entire HVAC installation is operating as intended.

With a dual-zone configuration, we must ensure that both spaces are properly served, that the controls operate correctly, and that the system can modulate its capacity according to demand.

The MIDEA multi-zone principle is to connect several indoor units to a single outdoor unit. Each indoor unit can be adjusted individually to provide a temperature suited to the corresponding zone.

This installation in Beloeil therefore tells more than just the story of a MIDEA heat pump installed in a residence. It also highlights the importance of commissioning, on-site measurements, and consistent sizing when the goal is to heat and cool two spaces with a single outdoor system.

Two zones, two heating and cooling needs, one outdoor heat pump

Here, the term “dual zone” means that two indoor units operate with the same multi-zone outdoor unit.

This configuration is particularly useful in a home where the two spaces have different needs. For example, they may be an upper floor and a ground floor, a living area and a bedroom area, or two parts of the residence with different sun exposure.

MIDEA documentation specifies that each indoor unit in a multi-zone system can be controlled separately. This makes it possible to heat or cool the spaces actually in use rather than imposing exactly the same demand on the entire house.

In practice, this zoning becomes particularly useful in Quebec.

In summer, a floor exposed to the sun may require more cooling while the lower level is already comfortable. During the heating season, a room with many windows or one that is farther away may need a different amount of heating than a better-protected interior zone.

With a MIDEA 28 two-zone heat pump, we have a much more targeted approach than with a single wall-mounted unit tasked with heating or cooling the entire residence from one location.

Why the temperature check visible in the photo is important

The photograph of this installation in Beloeil clearly shows a validation step near the indoor unit’s air outlet.

The goal is not simply to obtain a number.

A temperature measurement helps us confirm that the unit is responding correctly to commands and that heat transfer is actually taking place. This check must always be interpreted in context: room temperature, selected mode, fan speed, time elapsed since start-up, and outdoor conditions.

When commissioning a wall-mounted heat pump, we pay particular attention to:

• the indoor unit’s response to commands;
• the temperature of the discharged air;
• airflow;
• unusual vibrations or noises;
• condensate drainage in cooling mode;
• communication between the indoor and outdoor units;
• the behavior of the different zones;
• stable operation after the initial start-up period.

For a two-zone installation, this check must be considered for both indoor units, not just the one closest to the condenser.

The MIDEA 28 uses inverter modulation rather than simple on-off operation

The multi-zone lineup described by MIDEA uses inverter technology, which allows the system to adjust its output as conditions change. The manufacturer explains that capacity can be modulated through compressor and fan motor control. When all rooms do not require full capacity, the system can operate at partial load with reduced energy consumption.

This feature is fundamental in a two-zone installation.

Suppose both wall-mounted units are operating in the early evening. Once one zone approaches its desired temperature, the needs of the entire system change. An inverter heat pump can adapt its operation instead of simply repeating full on-and-off cycles.

This modulation generally promotes more stable comfort and explains why proper sizing remains essential: a larger heat pump is not automatically a better-suited heat pump.

The discreet advantage of a dual-zone system: reducing the number of condensers around the house

A dual-zone system also helps limit the outdoor footprint.

Two separate single-split systems would normally require two outdoor units. With a multi-zone system, several indoor units can be connected to the same condenser. MIDEA emphasizes that this architecture reduces the outdoor space required as well as the number of noise sources around the building.

In Beloeil, as in several areas of Longueuil and the South Shore, this advantage is far from theoretical.

Homes may present various constraints:

• narrow side passages;
• patios;
• basement windows;
• electrical entrances;
• landscaped areas;
• close proximity;
• zones that must remain accessible for maintenance.

Reducing the number of condensers can therefore greatly simplify the project design.

Not all MIDEA 28 systems have exactly the same performance

This is a point we often explain when preparing a MIDEA heat pump in Beloeil, Montreal, Laval, or Longueuil.

“MIDEA 28” refers to a family of multi-zone solutions, not a single universal combination that always has the same capacity, SEER2, and AHRI reference.

The MIDEA brochure presents different outdoor unit capacities as well as several configurations of zones and indoor units. For example, the range described includes outdoor units capable of handling three to six ports depending on the capacity, even though a given residential project may use only two zones.

The documentation also lists different AHRI references for non-ducted Extreme Heat configurations. As a reference within this family, these include:

• MO3HX-H18B-2A: AHRI 215471457;
• MO4HX-H27B-2A: AHRI 215471460;
• MO5HX-H36B-2A: AHRI 215471463;
• MO6HX-H48B-2A: AHRI 215471466;
• MO6HX-H60B-2A: AHRI 215471469.

However, the exact capacity of the outdoor unit used in the photographed installation in Beloeil cannot be read in the provided image. We therefore prefer not to arbitrarily assign a capacity in BTUs or an AHRI number to this project without the nameplate or the exact model combination.

This is precisely the right method when comparing heat pumps: identify the actual combination before comparing the figures.

Performance levels that can be very high depending on the certified combination

The brochure provides a good indication of the Extreme Heat line’s potential when it is paired with ductless units.

For certain reference combinations, the document indicates in particular:

• 19,000/20,000 BTU/h and SEER2 25 for the Extreme Heat 18,000 BTU configuration;
• 27,000/27,000 BTU/h and SEER2 23 for the 27,000 BTU configuration;
• 36,000/36,000 BTU/h and SEER2 23 for the 36,000 BTU configuration;
• 47,000/49,000 BTU/h and SEER2 23 for the 48,000 BTU configuration.

These figures show why it is risky to simply say that a “MIDEA 28 has a given SEER2.” Performance depends on the certified system combination.

For the homeowner, this distinction is important both for comparing equipment and for checking potential eligibility for a rebate.

Hydro-Québec rebate: the exact model must be verified

Simply installing a MIDEA 28 heat pump is not enough to automatically conclude that a specific financial incentive will be granted.

Eligibility must be verified using:

1. the exact condenser model;
2. the indoor unit model or models;
3. the certified combination;
4. the corresponding AHRI reference;
5. the program conditions in effect at the time of the project.

MIDEA documentation specifically contains combination tables and several distinct AHRI references. This confirms that a serious verification must cover the entire system, not just the MIDEA logo or the product line name.

For a Beloeil homeowner comparing several quotes, we therefore recommend clearly asking the bidder: “What is the AHRI number of the combination you are proposing?”

This simple question can often distinguish a carefully prepared quote from a more approximate estimate.

What this MIDEA 28 installation in Beloeil shows about the quality of genuine HVAC work

A properly installed wall-mounted unit must also be positioned correctly

The interior photo also shows the wall-mounted unit’s elevated position near the ceiling.

A wall-mounted unit must be positioned to allow good air circulation while maintaining the necessary clearances. The selected position must also take the actual use of the room into account.

We seek to avoid several common mistakes:

Blowing air directly onto a bed or workstation

Even with an excellent heat pump, a poorly directed airflow can become uncomfortable.

Installing the unit in an area where the air remains trapped

A location in a recess or behind an obstacle can reduce the distribution of heating and cooling.

Choosing the indoor location without considering the outdoor route

The position of a wall-mounted unit directly influences the location of the opening, refrigerant lines, and condensate drain.

Choosing BTUs based solely on floor area

Two rooms of the same size can have very different needs if one has large windows or significant sun exposure.

A great deal of flexibility in choosing indoor units

MIDEA’s documentation presents a particularly broad range of units compatible with its multi-zone platform: wall-mounted units, consoles, cassettes, ducted units, and air handlers. The manufacturer indicates a range comprising several types and numerous models intended for different residential applications.

For a residential dual-zone heat pump in Beloeil, wall-mounted units are often a very practical solution when the house does not have central ductwork.

The All Easy Pro lineup presented in the brochure includes wall-mounted units with different capacities, including 208/230 V power supplies.

This means you do not have to install exactly the same capacity in both zones.

A large open-plan area and a bedroom generally do not need the same airflow or rated capacity.

Pay attention to available capacity when multiple zones require heating

This is probably one of the most important pieces of advice for any homeowner comparing multi-zone systems.

Adding together the rated capacities listed on the indoor units does not necessarily mean that the condenser will be able to provide that total continuously.

MIDEA specifies that when the total load of the indoor units exceeds the outdoor unit’s rated capacity, the capacity actually available to each unit may be reduced. The manufacturer indicates that this situation becomes particularly noticeable in heating mode.

That is why we need to look at the house as a complete thermal system.

Sizing a dual-zone heat pump must take into account, among other things, the likelihood that both zones will simultaneously require high capacity during cold periods.

An interesting technology for installers: SynchroConnect

The MIDEA multi-zone lineup presented in the documentation also features SynchroConnect.

According to MIDEA, the system can diagnose the association between the electrical connections and the refrigerant circuits after connection. The manufacturer also describes a synchronization capability between the lines and their corresponding connections in certain configurations.

This function obviously does not replace a methodical installation.

Rather, it adds another tool to the commissioning process, precisely when we want to confirm that each zone corresponds correctly to its circuit and responds as expected.

Why the last hour of the job is just as important as the first

The photograph from Beloeil perfectly sums up this idea.

The unit is already installed. It is working. Yet the validation work continues.

We want to know how the system actually performs.

Proper commissioning includes checking operation, temperatures, drainage, controls, and the behavior of the different zones. The homeowner must then understand how to use the system without working against it by constantly changing the setpoints.

With a multi-zone heat pump, we generally recommend avoiding extremely different settings between the zones. The system shares a single outdoor unit and must be used as a coherent whole.

A project representative of our approach in Beloeil and on the South Shore

This MIDEA 28 dual-zone heat pump installation in Beloeil clearly demonstrates what we strive for at AirGreen: not stopping at the physical installation of the equipment.

We want the installation to be properly sized, the units to be positioned intelligently, the two zones to operate as intended, and commissioning to confirm the result.

This is also the approach we apply in our heat pump installations in Montreal, Laval, Longueuil, on the North Shore and the South Shore.

For a homeowner currently considering a dual-zone heat pump, the right questions to ask are therefore not simply “how many BTUs?” and “how much does installation cost?”

It is also necessary to verify the exact model combination, the actual available capacity when the zones operate together, the AHRI number, the location of the units, the routing of the lines, and how the installer plans to carry out commissioning.

It is this preparation and validation work that transforms a MIDEA heat pump installed on a wall into a true HVAC system suited to the home.