In Vaudreuil-Dorion, a MIDEA28 installed where positioning required genuine technical consideration
This MIDEA MIDEA28 wall-mounted heat pump installation in Vaudreuil-Dorion perfectly represents the kind of project where the quality of the result depends as much on the choice of location as on the equipment's performance.
In the photograph taken after our work, the Midea indoor unit is positioned very high on the wall, near the ceiling and in an area of the room where several constraints converge: a very close side wall on the left, an opening with a curtain rod on the right, and relatively little available space above the occupied area.
In such a configuration, moving the unit a few inches can completely change the result. Too far to the left, it moves unnecessarily close to the adjacent wall. Too far to the right, it may conflict with the curtain rod and opening. Too low, it takes up more wall space and alters airflow distribution. Too high, it may lack the clearance required for air intake and maintenance.
We therefore worked with the space that was actually available to incorporate the MIDEA28 compactly while maintaining a clear airflow outlet toward the room.
This series is part of the ductless wall-mounted systems offered by Midea in Quebec. The MIDEA28 is classified as a top wall-mounted series, uses the refrigerant R-454B, is identified Cold Climate V6.1 and can operate in heating mode down to -30°C. Depending on the selected capacity, its efficiency reaches up to 27.4 SEER2 and 13.5 HSPF2.
What the photo immediately tells us about the project
The image of this installation in Vaudreuil-Dorion allows several concrete details to be observed.
The unit is positioned:
- very close to the upper part of the wall;
- near an inside corner;
- near a window or opening equipped with a curtain rod;
- in an area where a larger location was clearly not available;
- with the airflow louvers completely unobstructed toward the room.
We also note that no long run of line-hide is visible on the photographed wall. The result therefore remains visually discreet.
For a homeowner, it may seem simple in hindsight. For our technicians, the challenge is precisely to achieve that apparent simplicity without compromising the operation of the wall-mounted heat pump.
Why we do not place an indoor unit in the first available spot
A wall-mounted heat pump draws air from the room, passes it through its heat exchanger, and then redistributes it through its lower section.
The location must therefore allow for:
- adequate air intake;
- effective air distribution;
- proper opening of the flap;
- future access to the filters;
- access for cleaning and servicing;
- the refrigerant connection;
- condensate drainage;
- the secure fastening of the wall plate.
The proximity of the ceiling can be advantageous for air distribution, particularly in cooling mode, but it must never prevent the machine from breathing properly.
That is why we measure the space before drilling the wall.
An additional constraint: the proximity of the side wall
In this installation, the left side of the unit is relatively close to a perpendicular wall.
This type of situation requires particular attention because a wall-mounted unit must not be wedged into a space that prevents air circulation or access to its components.
We must also anticipate maintenance.
Even if a machine works perfectly on the day it is installed, one day it will need to be:
- cleaned;
- inspected;
- opened;
- diagnosed;
- eventually repaired.
A location that makes these operations nearly impossible can unnecessarily create additional costs several years later.
At AirGreen, we therefore consider future maintenance from the moment we choose the mounting point.
The curtain rod visible on the right also influences the positioning
An interesting detail in the photo is the presence of a curtain rod near the unit.
In an existing home, we must work with the architecture and layout rather than in a completely empty room.
Windows, doors, furniture, frames, trim, curtain rods, light fixtures, and cabinets can all influence the positioning of a wall-mounted heat pump in Vaudreuil-Dorion.
It is therefore not enough to check whether the unit physically “fits” on the wall.
We must also consider whether its flap will be able to open normally, whether the curtain could end up directly in the airflow, and whether the unit will remain accessible.
Why a ductless heat pump is particularly well suited to this type of room
The main architectural advantage of a wall-mounted heat pump is that it does not require a complete air duct network.
Midea indicates that the indoor unit can be connected to the outdoor unit through a relatively small opening in the wall, which generally makes it possible to avoid major demolition and reconstruction work.
For an existing property Vaudreuil-Dorion, this can represent a significant difference.
Adding a central system to a home that was never designed to accommodate ductwork may require much more invasive work. A wall-mounted heat pump allows you to target a specific area while limiting modifications to the building.
MIDEA28: a complete range whose technical details genuinely change according to capacity
Five available capacities, from 9,000 to 33,000 BTU
The MIDEA28 series comprises five main configurations.
| Cooling capacity | Indoor unit | Outdoor unit | AHRI reference |
|---|---|---|---|
| 9,000 BTU/h | MSEHU-H09B-2A | MO1HS-H09B-2A | 215471380 |
| 12,000 BTU/h | MSEHU-H12B-2A | MO1HS-H12B-2A | 215471381 |
| 18,000 BTU/h | MSEHU-H18B-2A | MO1HS-H18B-2A | 215471382 |
| 24,000 BTU/h | MSEHU-H24B-2A | MO1HS-H24B-2A | 215471383 |
| 33,000 BTU/h | MSEHU-H33B-2A | MO1HS-H33B-2A | 215471384 |
In heating mode, the nominal capacities published by Midea are respectively 12,000, 12,000, 18,000, 29,000 and 36,000 BTU/h.
The indoor unit nameplate visible in the photo is not legible enough to reliably confirm the capacity installed at this site.
We therefore do not arbitrarily assign a number of BTUs to it.
This clarification is important: MIDEA28 is the name of the series, not the heat pump's capacity.
Sizing is not based solely on square footage
When a homeowner is looking for a heat pump in Vaudreuil-Dorion, they often encounter tables that automatically associate a floor area with a number of BTUs.
These tables can provide initial guidance, but they do not replace a property assessment.
We also consider:
- insulation;
- the number of exterior walls;
- fenestration;
- solar orientation;
- ceiling height;
- air infiltration;
- the layout of the rooms;
- the circulation between spaces;
- heating requirements during cold periods.
A highly glazed room exposed to the sun may have very different cooling requirements from a space of the same size facing north.
Up to 27.4 SEER2 in cooling mode
The MIDEA28's seasonal performance varies according to capacity.
Midea publishes:
- 27.4 SEER2 for the 9,000 BTU unit;
- 25.4 SEER2 for the 12,000 BTU unit;
- 21.4 SEER2 for the 18,000 BTU model;
- 21.0 SEER2 for the 24,000 BTU model;
- 19.5 SEER2 for the 33,000 BTU model.
The corresponding HSPF2 IV ratings are 12.5, 10.5, 11.0, 13.5 and 10.5.
These data demonstrate why we always encourage our customers to compare the specific model indicated on a quote rather than only the maximum value advertised for an entire product range.
Heating down to -30 °C for Vaudreuil-Dorion
One of the important features of the MIDEA28 is its low-temperature operating range.
The five configurations are advertised as operating in heating mode down to -30 °C to 24 °CMidea also indicates a cooling operating range of -30 °C to 50 °C.
For the climate of Vaudreuil-Dorion, this type of feature deserves particular attention.
But “operates down to -30 °C” does not mean that a heat pump delivers exactly the same capacity at -30 °C as it does at 0 °C.
Available capacity varies with the outdoor temperature.
Performance at -15 °C provides much more useful information
Midea’s documentation lists nominal heating capacities at -15 °C :
- 11,500 BTU/h for the 9,000 BTU model;
- 11,500 BTU/h for the 12,000 BTU;
- 18,000 BTU/h for the 18,000 BTU;
- 24,200 BTU/h for the 24,000 BTU;
- 35,000 BTU/h for the 33,000 BTU;
These figures become particularly relevant when a homeowner wants their low-temperature heat pump contributes significantly to heating the home during the winter.
We then seek to understand how much heat the unit can actually deliver when the outdoor temperature drops.
Variable-speed technology for greater stability
The MIDEA28 uses Midea’s variable-speed modulation technology.
The compressor can adjust its operation based on demand rather than operating solely on a conventional on-off cycle.
The manufacturer’s documentation indicates that this modulation helps maintain a more stable temperature and reduce fluctuations in the room.
When a unit is properly sized, this feature truly comes into its own.
Instead of waiting for the room to become too cold or too hot before restarting abruptly, the system can reduce its speed and maintain the setpoint more gradually.
Up to 100 indoor fan-speed settings
Airflow management is particularly useful on a unit installed high on a wall, as in the photographed project.
Midea states that its wall-mounted units offer up to 100 airflow volume settings, allowing continuous fan adjustment.
This makes it possible to prioritize:
- high airflow when the room needs to be heated or cooled quickly;
- more moderate airflow once the temperature has stabilized;
- quiet operation during periods of low demand.
The louver direction can also be adjusted so that air is not unnecessarily blown directly at an occupant.
Follow Me: useful when the heat pump is installed near the ceiling
The temperature measured higher up is not always identical to the temperature felt in the occupied zone.
Midea offers the Follow Me, which uses the remote control’s built-in temperature sensor. The system can therefore rely on the temperature measured closer to the user.
In an installation like this, where the wall-mounted head is located relatively close to the ceiling, this function can allow regulation that more accurately reflects the comfort felt in the room.
Sleep mode, silent mode, and Wi-Fi control
The MIDEA28 has several functions that can be useful in everyday life.
Among those presented by Midea are:
- ECO mode;
- Turbo;
- sleep mode;
- timer;
- child lock;
- Follow Me function;
- automatic cleaning;
- silent mode;
- 8°C heating;
- horizontal swing;
- vertical swing;
- Wi-Fi control;
- smart sensor;
- humidity control;
- optional wired control;
- optional 24 V interface.
The Wi-Fi control allows the system to be controlled remotely from a compatible device.
An 8°C heating mode useful during absences
The mode 8°C heating maintains a minimum temperature when the building is unoccupied.
According to Midea, this function is intended in particular to reduce the risk of freezing during a prolonged absence in cold weather.
For some homeowners who leave their residence for part of the winter, this option can be particularly practical.
Indoor sound levels vary significantly depending on capacity and mode
Acoustic comfort is important when a unit is installed directly in a bedroom or living area.
Depending on the MIDEA28 capacities, the documentation indicates indoor sound levels that can drop to approximately 19.5 dB(A) on several models and up to 16 dB(A) on the 24,000 BTU configuration under certain ventilation conditions.
The noise actually heard obviously depends on:
- of the fan speed;
- of the required load;
- of the operating mode;
- of the room's acoustics.
The choice of location also influences the perception of sound.
The physical dimensions explain why we measure before installation
The space photographed in Vaudreuil-Dorion is relatively limited. The dimensions of the indoor head therefore become important.
Depending on capacity, the width of the MIDEA28 unit varies:
- 31.30 in for the 9,000 and 12,000 BTU models;
- 37.99 in for the 18,000 BTU model;
- 44.88 in for the 24,000 and 33,000 BTU models.
A difference of more than thirteen inches between the most compact and widest configurations can completely change the feasibility of an installation near a corner, window, or door.
That is why the BTU rating must be confirmed along with the project's physical feasibility.
The refrigerant lines also vary according to capacity
The piping is not universal on the MIDEA28.
Midea specifies:
- 1/4 in. and 3/8 in. for the 9,000 and 12,000 BTU models;
- 1/4 in. and 1/2 in. for the 18,000 BTU model;
- 3/8 in. and 5/8 in. for the 24,000 BTU model;
- 3/8 in. and 3/4 in. for the 33,000 BTU model.
This check becomes essential when replacing an old heat pump.
We do not automatically reuse lines simply because they are already in the wall. Their diameter and compatibility must match the new unit.
Maximum length: up to 164 feet depending on the model
Midea also specifies different maximum lengths:
- 82 ft for the 9,000 and 12,000 BTU versions;
- 98.4 ft for the 18,000 BTU version;
- 164 ft for the 24,000 and 33,000 BTU models.
This flexibility can facilitate certain installations where the outdoor unit must be located far from the wall-mounted head.
The electrical supply must match the installed unit exactly
All MIDEA28 configurations use a 208/230 V, single-phase, 60 Hz.
For the outdoor unit, the minimum allowable amperage ranges from 15 A to 34 A, while the maximum protection ranges from 15 A to 35 A depending on the capacity.
This means that a heat pump installation in Vaudreuil-Dorion must necessarily include checking the available circuit.
A unit should not be selected independently of the building’s electrical installation.
Future maintenance is part of choosing the location
The photo shows the Midea unit installed relatively high and in a compact area.
This makes it all the more important to plan for maintenance from the time of installation.
Midea indicates that, for the MIDEA35, MIDEA28, and MIDEA25 series, the indoor fan wheel can be removed to allow for thorough cleaning of the unit.
Over the years, filters are not the only components that accumulate dust.
The blower wheel, heat exchanger, and internal surfaces may also require HVAC maintenance more comprehensive.
A well-planned location must therefore allow for this work.
Rebates: always start with the AHRI reference number
The five MIDEA28 capacities have the following AHRI reference numbers 215471380 to 215471384 and are listed Cold Climate V6.1 in the manufacturer’s documentation.
When a homeowner wants to take advantage of a rebate, we recommend verifying the exact AHRI number of the combination actually installed, as well as the criteria of the program applicable at the time of the work.
The mention “MIDEA28” alone does not automatically confirm an incentive amount.
Residential warranty presented by Midea
For the residential sector, the Midea brochure presents a 12-year limited warranty on the compressor, 12 years on parts, and 10 years on labor, according to the program’s applicable terms.
As always, the registration conditions and the manufacturer’s requirements must be met to maintain the applicable coverage.
The mistakes we seek to avoid on an installation like this
This installation of MIDEA28 in Vaudreuil-Dorion helps illustrate several common mistakes.
Installing the unit too close to the ceiling
Saving a few inches is not useful if it restricts air intake.
Mounting the wall unit too close to a corner
The proximity of a side wall must be assessed based on the required clearances and access.
Ignoring a curtain rod or future curtain
A curtain that constantly hangs in front of the air outlet can disrupt air distribution.
Choosing the capacity before measuring the wall
A 33,000 BTU MIDEA28 is physically much wider than a 9,000 BTU version.
Forgetting the drainage
A heat pump produces condensate during cooling. Its drainage must be planned with the same care as the refrigerant lines.
Making the filters difficult to access
The owner must be able to perform basic maintenance without dismantling part of the room.
A discreet installation that effectively sums up our approach at AirGreen
The final result of this installation of a MIDEA MIDEA28 wall-mounted heat pump in Vaudreuil-Dorion appears relatively simple: a white unit neatly integrated into the upper part of the wall.
That is exactly what we strive for.
Technical work does not necessarily have to dominate a room visually. The piping, placement, clearances, and mounting must be carefully planned so that the equipment becomes a functional component of the home rather than an obstacle added as an afterthought.
On this project, the proximity of the ceiling, the wall corner, and the curtain rod clearly limited the options. We used the available area precisely to preserve open airflow into the room.
This same approach guides us on our wall-mounted heat pump, air conditioning and heating in Montreal, Laval, Longueuil, the North Shore, and the South Shore.
The MIDEA28 offers a wide capacity range and heating operation down to -30°C, the refrigerant R-454B, variable-speed technology, and efficiency of up to 27.4 SEER2.
But on this Vaudreuil-Dorion project, the real success is not measured solely by the equipment’s specifications.
It is also reflected in having successfully integrated the unit into a limited wall area while preserving what truly matters: airflow, accessibility, comfort, and a clean finish.