Installation of a MIDEA MIDEA28 wall-mounted heat pump in Anjou, Montreal, in a narrow indoor space

In Anjou, a MIDEA28 installed above an opening to preserve every square foot of interior space

This MIDEA MIDEA28 wall-mounted heat pump installation in Anjou, in eastern Montreal, clearly illustrates why positioning the indoor unit deserves as much attention as choosing the machine itself. On this AirGreen project, we had to work in a narrow area where several architectural constraints greatly reduced the number of possible locations.

The photograph makes the challenge immediately clear. The Midea indoor unit is located very high on the wall, directly above a large opening with a sliding door, between two relatively close side walls. The ceiling is also nearby. A detector is installed on the ceiling near the area, and the space available in front of the heat pump is clearly used as a passage between different parts of the home.

Rather than using a lower wall and sacrificing a potentially useful surface, we used this upper area. The heat pump can therefore distribute air throughout the room while keeping the passage completely clear.

The photo also shows the unit in operation: the louvers are open and the central display indicates 60 at the time the photo was taken. We cannot determine from the image alone whether this figure represents a particular setting or the display of a specific mode, but it confirms that the unit had been commissioned.

For us, this kind of project in Anjou is particularly interesting because it shows what a brochure can never anticipate: the machine has its technical specifications, but the building imposes its own rules. Our job is to make the two work together.

A location above an opening: practical, but not automatic

Install a wall-mounted heat pump above a door or opening can be an excellent solution when the room’s geometry is suitable.

This configuration makes it possible to:

• keep the side surfaces available for furniture;
• avoid installing a unit at passage height;
• use an area of the wall that would otherwise be difficult to utilize;
• position the air outlet high enough to promote its distribution;
• reduce the equipment’s visual impact in a small room.

But it is not enough to measure the available width and mount the wall unit.

We must also ask ourselves whether the unit will have enough space to draw in air, whether the cover can be opened, whether the filters can be removed, and whether the louvers will have a clear path.

In this installation inAnjou, the heat pump occupies almost the entire usable width of the selected area. The placement therefore had to be precise.

In a tight space, the unit’s actual width becomes a jobsite consideration

The MIDEA28 is available in several capacities, and the indoor unit dimensions vary considerably from one version to another.

According to Midea documentation, the 9,000 and 12,000 BTU indoor units measure approximately 31.30 in wide. The 18,000 BTU model measures 37.99 in, while the 24,000 and 33,000 BTU models are approximately 44.88 in.

This difference may seem minor when comparing equipment on paper. On a jobsite like the one shown in Anjou, it becomes essential.

A few extra inches can determine whether the unit:

• fits properly between two walls;
• maintains its clearances;
• remains visually centered;
• allows the connections to pass through;
• remains accessible for maintenance.

That is why we always check the exact dimensions of the wall-mounted head before confirming the final location.

MIDEA28 does not mean 28,000 BTU

The name MIDEA28 refers to a series, not a single capacity.

The brochure provided presents five configurations:

• 9,000 BTU : MSEHU-H09B-2A with MO1HS-H09B-2A, AHRI 215471380;
• 12,000 BTU : MSEHU-H12B-2A with MO1HS-H12B-2A, AHRI 215471381;
• 18,000 BTU : MSEHU-H18B-2A with MO1HS-H18B-2A, AHRI 215471382;
• 24,000 BTU : MSEHU-H24B-2A with MO1HS-H24B-2A, AHRI 215471383;
• 33,000 BTU : MSEHU-H33B-2A with MO1HS-H33B-2A, AHRI 215471384.

The photo does not show the model label clearly enough to determine with certainty which of these capacities was installed.

We therefore prefer not to arbitrarily assign a BTU rating to the project.

This clarification is also useful for homeowners looking for a MIDEA28 heat pump in Anjou or Montreal : simply asking for “the price of a MIDEA28” is not enough. The exact capacity and unit combination must be known.

The BTU selection must be based on the home, not solely on the available space

The fact that a small wall-mounted head fits better in a given area does not automatically mean that its capacity is suitable for the home.

Conversely, selecting the largest available unit simply because you want “more heating” is not necessarily a good strategy.

We analyze, among other factors:

• the area to be conditioned;
• heat loss;
• insulation;
• the number and type of windows;
• sun exposure;
• room layout;
• corridors and openings;
• ceiling height;
• potential air circulation.

In a configuration like the one shown in the photo, the unit placement above a passageway also affects air distribution to adjacent spaces.

Sizing must therefore be done with the building in mind.

A heat pump designed to provide heating down to -30 °C

One of the main advantages of the MIDEA28 in Quebec is its low-temperature operating capacity.

Midea documentation classifies this series among its extreme-climate heat pumps and indicates a heating operating range extending down to -30°C for the five documented capacities. The systems are also identified as Cold Climate V6.1.

For an installation at Anjou, this feature is important.

A wall-mounted heat pump is no longer simply an air conditioner that provides light heating in the spring and fall. A system designed for cold climates can contribute to heating for a much larger portion of the Montreal winter.

Nevertheless, two concepts must be distinguished: operate at -30 °C and deliver its maximum capacity at -30 °C.

The amount of available heat varies with the outdoor temperature. That is why we place so much importance on low-temperature performance data.

Documented heating capacity at -15 °C

For the MIDEA28, Midea publishes nominal heating capacities at -15 °C :

• 9,000 BTU: 11,500 BTU/h;
• 12,000 BTU: 11,500 BTU/h;
• 18,000 BTU: 18,000 BTU/h;
• 24,000 BTU: 24,200 BTU/h;
• 33,000 BTU: 35,000 BTU/h.

This data is much more useful for evaluating a heat pump in the context of a Montreal winter than the nominal cooling capacity figure alone.

They also explain why two 12,000 BTU systems belonging to different product families can offer very different winter performance.

Up to 27.4 SEER2 depending on the configuration

The MIDEA28 also offers impressive cooling efficiency.

The published SEER2 values are:

• 27.4 for the 9,000 BTU version;
• 25.4 for the 12,000 BTU model;
• 21.4 for the 18,000 BTU model;
• 21.0 for the 24,000 BTU model;
• 19.5 for the 33,000 BTU model.

HSPF2 IV ranges from 10.5 to 13.5 depending on the combination, with the maximum value of 13.5 HSPF2 being associated with the 24,000 BTU model in the table provided.

This is a reminder that a figure advertised as “up to 27.4 SEER2” does not automatically apply to every MIDEA28.

To properly compare several heat pumps, we must always use the data for the exact AHRI number included in the quote.

What this MIDEA28 installation in Anjou teaches us about comfort, maintenance, and HVAC planning

Airflow direction matters especially in a passageway

The photographed unit has its louvers open and is located directly above an opening.

In this configuration, airflow direction becomes particularly important. We want to use the available height to project the air toward the occupied area rather than create an unpleasant draft directly on someone passing through the opening.

The MIDEA28 series offers several functions for this purpose:

• fan speed setting 1% to 100%;
• horizontal swing;
• vertical swing;
• quiet mode;
• “Follow Me” function;
• night mode;
• ECO setting;
• 8 °C heat maintenance.

The brochure also specifies that the wall-mounted unit allows up to 100 airflow-volume adjustment levels, allowing for finer airflow modulation.

In a small indoor space, this fine adjustment is often more useful than ventilation constantly running at maximum.

Airflow changes considerably with capacity

The number of BTUs directly affects the volume of air that the wall-mounted unit can move.

For the MIDEA28, Midea publishes maximum airflow rates ranging from approximately 441 CFM for the 9,000 and 12,000 BTU models up to approximately 865 CFM for the 33,000 BTU version.

This matters a great deal in an installation like this.

A larger unit does not mean only greater cooling capacity. It also means a wider indoor unit and a greater volume of air.

In a narrow passageway, this airflow must be able to spread through the room without being immediately blocked by an opposite wall or another architectural element.

The proximity of the ceiling must be assessed before mounting

The photograph clearly shows that the unit is positioned relatively high.

We must always maintain the necessary clearance so that the unit can draw in air properly and a technician can access the upper section.

An overly confined location can cause several practical problems:

• difficult access to the filters;
• complicated cleaning;
• more demanding cover removal;
• less favorable airflow;
• longer service work.

In this Anjou installation, using the upper area preserves the passageway, but this decision must always be balanced against the equipment’s mechanical requirements.

An important detail visible in the photo: the presence of a ceiling-mounted detector

We can also see a detector installed on the ceiling in the same general area.

A photograph cannot determine the detector’s exact type, its regulatory requirements, or the precise compliance of its placement in relation to the heat pump.

However, it also highlights an important planning rule: an HVAC installation must take into account all equipment already present, rather than just the available walls.

Before mounting a unit, we look at detectors, light fixtures, ducts, outlets, doors, trim, and other elements that could affect installation or future maintenance.

The “Follow Me” function can be useful when the indoor unit is mounted very high

A wall-mounted heat pump generally measures the temperature in the area around its indoor unit, but the temperature near the ceiling may differ from what is felt lower down in the room.

The MIDEA28 offers the “Follow Me”The documentation indicates that the sensor built into the remote control can measure the room temperature to help the unit adjust its operation based on the area where the remote is located.

In an installation as high as this one, this feature may be useful when the occupant wants the control system to take greater account of the temperature perceived in the occupied zone.

Quiet operation matters in a home

The MIDEA28 also offers relatively low indoor sound levels at reduced speeds.

Depending on capacity, the published minimum values are approximately between 16 and 29.5 dB(A) in the corresponding modes.

In an apartment or house in Anjou, this feature is important, especially when the heat pump is installed near a bedroom, hallway, or living area.

The level actually heard obviously depends on fan speed, the requested load, and the home’s acoustics.

Variable-speed technology: less on-off operation

Midea uses variable-speed technology that allows the compressor to modulate its operation according to thermal demand.

The manufacturer states that this modulation helps maintain a more stable temperature and reduce fluctuations associated with conventional systems that operate primarily in on-off cycles.

In practice, when the home approaches the desired temperature, the unit can gradually reduce its output rather than consistently operating at maximum capacity.

This modulation contributes to comfort and further underscores the importance of proper sizing.

R-454B: a next-generation MIDEA28

MIDEA28 outdoor units use R-454B refrigerant.

The brochure also associates the series with an A2L dispersion system and an A2L refrigerant leak detection sensor.

For homeowners, this mainly means that a new MIDEA28 heat pump must be installed and serviced using methods suitable for this refrigerant.

For us, this means, among other things, working with the appropriate procedures and equipment during commissioning and future service calls.

Refrigerant lines vary considerably between 9,000 and 33,000 BTU

Another point that shows the importance of precisely identifying the model: refrigerant line sizes change with capacity.

Midea specifies:

• 9,000 BTU: 1/4 in and 3/8 in;
• 12,000 BTU: 1/4 in and 3/8 in;
• 18,000 BTU: 1/4 in and 1/2 in;
• 24,000 BTU: 3/8 in and 5/8 in;
• 33,000 BTU: 3/8 in and 3/4 in.

This difference is particularly important when a heat pump replaces an older system.

Existing piping should never be assumed to be compatible solely because the old and new units have similar capacities.

Electrical requirements vary as well

The entire range operates on 208/230 V, single-phase, 60 Hz, but the outdoor unit’s minimum ampacity increases with capacity.

The documentation states:

• 15 A for the 9,000 and 12,000 BTU models;
• 19 A for the 18,000 BTU model;
• 24.9 A for the 24,000 BTU model;
• 34 A for the 33,000 BTU model.

The specified maximum protection ranges from 15 to 35 A depending on the combination.

We therefore always check the panel and circuit before confirming an heat pump installation in Anjou.

Future maintenance was part of our thinking

The location visible in the photo is compact. This makes maintenance planning even more important.

The filters must be removable, and the inside of the unit must remain accessible.

Midea specifically indicates that the blower wheel in the MIDEA35, MIDEA28, and MIDEA25 series can be removed to facilitate deep cleaning.

This is a particularly interesting feature for wall-mounted heat pump maintenance after several years of use.

Cleaning only the filters is not always enough. Dust and deposits can gradually build up on the heat exchanger and blower wheel.

Designing them for easy access therefore represents a concrete long-term advantage.

What about rebates for this MIDEA28?

The Midea brochure identifies the five AHRI numbers in the MIDEA28 range, but it does not provide a rebate amount corresponding to this particular Anjou installation.

We therefore cannot confirm a specific rebate based solely on the documents provided.

Eligibility must be verified using:

• the exact indoor/outdoor combination;
• the AHRI number;
• the capacity;
• the installation date;
• the requirements of the applicable program.

For a homeowner comparing several quotes, this verification is important. An amount associated with a single model should not be automatically applied to the entire MIDEA28 range.

An AirGreen installation that transforms a difficult area into a functional location

This installation of a MIDEA MIDEA28 wall-mounted heat pump in Anjou is a good example of a job site where location is an essential part of the solution.

The unit had to be integrated into a high, relatively narrow area, directly above an opening and between two walls. We had to preserve the passageway, maintain air distribution, and anticipate future access to the machine.

The MIDEA28, for its part, offers a complete range of capacities, from 9,000 to 33,000 BTU, operation in heating mode down to -30°C, a R-454B, variable-speed technology and efficiencies of up to 27.4 SEER2.

But an excellent technical specification never replaces an installation suited to the building.

At AirGreen, we apply this approach in ourHVAC installation in Anjou and Montreal, but also in Laval, Longueuil, on the North Shore and on the South Shore determine the right capacity, study airflow, choose the best possible location, and plan for future maintenance from the outset.

At this Anjou job site, the available space was limited. We used it intelligently so that the heat pump could do its job without compromising movement or the room’s everyday use.