Installation of a MIDEA MIDEA28 wall-mounted heat pump in Vaudreuil-Dorion: precise near-ceiling integration in a restricted indoor space
In Vaudreuil-Dorion, AirGreen installs a MIDEA28 wall-mounted heat pump near the ceiling in a limited space, with precise positioning, heating down to -30 °C, and discreet indoor integration.
In summer, the outdoor unit rejects the house's heat outside.
Generic illustration of this type of installation, not a survey of this job site. Tap a number.
Mounted level on a wall plate, high enough for the air to reach the whole room, with enough space around it to slide the filters out easily.
The refrigerant lines, the communication cable and the drain go through the wall in a single opening, sealed against water, cold air and insects.
Two insulated copper pipes connect the two units. Outside, a line cover can protect them from sun, knocks and weather.
A shut-off switch near the outdoor unit isolates it safely for service. It must stay accessible at all times.
The compressor and the fan. In heating mode it captures heat from the outdoor air, even in winter, and moves it inside.
On the ground or on the wall, it keeps the unit above accumulated snow. The unit stays clear and defrost water can drain away.
The fan needs to blow freely. Storage, a fence or a wall too close, and efficiency drops while noise goes up.
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.
How it goes, from the first call to the end
The main steps of this kind of job at AirGreen. Every house has its quirks: the estimate brings them out.
We look at the room, the outside wall, the line route and where the outdoor unit will go. That is where the capacity gets chosen.
Model, capacity and price, in writing. We also check whether the model qualifies for assistance programs.
Floors and furniture protected, wall plate position marked level, wall opening located.
A single opening, with the slope the drain needs to flow outside.
Set on a stand raised above the snow, with the clearances the manufacturer requires.
Connected, insulated and protected. The opening is then sealed against water, cold air and insects.
A dedicated circuit and an accessible disconnect near the outdoor unit.
Leak test, vacuum, then start-up and a check of heating and cooling.
Remote, modes, filters: we show you the essentials before we leave.
- The on-site estimateWe look at the room, the outside wall, the line route and where the outdoor unit will go. That is where the capacity gets chosen.
- The quoteModel, capacity and price, in writing. We also check whether the model qualifies for assistance programs.
- Getting readyFloors and furniture protected, wall plate position marked level, wall opening located.
- The wall openingA single opening, with the slope the drain needs to flow outside.
- The outdoor unitSet on a stand raised above the snow, with the clearances the manufacturer requires.
- Lines, cable and drainConnected, insulated and protected. The opening is then sealed against water, cold air and insects.
- The electrical workA dedicated circuit and an accessible disconnect near the outdoor unit.
- Tests and start-upLeak test, vacuum, then start-up and a check of heating and cooling.
- The walkthroughRemote, modes, filters: we show you the essentials before we leave.
What the unit delivers when it is cold
The range as published on airgreen.ca: pick a size to see its capacity in deep cold.
| Size | Heating at −8 °C | Heating at −15 °C | Coldest certified point | COP at −15 °C | SEER | HSPF | Indicative LogisVert aid |
|---|---|---|---|---|---|---|---|
| Midea Série 28 9 000 | 12,000 | 11,500 | −30 °C: 5,100 | 1.8 | 27.4 | 12.5 | – |
| Midea Série 28 12 000 | 12,000 | 11,500 | −30 °C: 5,900 | 1.8 | 25.4 | 10.5 | $1,440 |
| Midea Série 28 18 000 | 18,000 | 18,000 | −30 °C: 8,000 | 1.92 | 21.4 | 11.0 | $2,160 |
| Midea Série 28 24 000 | 22,200 | 24,200 | −30 °C: 11,900 | 2.34 | 21.0 | 13.5 | $2,664 |
| Midea Série 28 33 000 | 32,000 | 35,000 | −30 °C: 20,700 | 1.98 | 19.5 | 10.5 | $3,840 |
According to NEEP, it delivers 12,000 BTU/h at −8 °C (17 °F), as much as at 8 °C. It heats as hard in moderate cold as in mild weather.
At 8 °C, its certified maximum capacity reaches 16,000 BTU/h, 78% more than its nominal 9,000 BTU size.
According to NEEP, its certified heating capacity at −15 °C (5 °F) is 11,500 BTU/h, 128% of its nominal 9,000 BTU size. Its COP there is 1.80.
According to NEEP, it delivers 12,000 BTU/h at −8 °C (17 °F), as much as at 8 °C. It heats as hard in moderate cold as in mild weather.
At 8 °C, its certified maximum capacity reaches 16,000 BTU/h, 33% more than its nominal 12,000 BTU size.
At −30 °C, its certified minimum capacity is 2,000 BTU/h (3,800 at 8 °C). It slows down instead of cycling on and off.
According to NEEP, it delivers 18,000 BTU/h at −8 °C (17 °F), as much as at 8 °C. It heats as hard in moderate cold as in mild weather.
According to NEEP, its certified heating capacity at −15 °C (5 °F) is 18,000 BTU/h, 100% of its nominal 18,000 BTU size. Its COP there is 1.92.
According to NEEP, its COP at −15 °C is 2.34: the highest of the Série 28 line, which ranges from 1.80 to 1.98 at that temperature.
At −30 °C, its certified minimum capacity is 2,400 BTU/h (11,800 at 8 °C). It slows down instead of cycling on and off.
According to NEEP, its certified heating capacity at −15 °C (5 °F) is 24,200 BTU/h, 101% of its nominal 24,000 BTU size. Its COP there is 2.34.
According to NEEP, its certified maximum capacity at −30 °C (−22 °F) is 20,700 BTU/h, 63% of its nominal 33,000 BTU size.
At −30 °C, its certified minimum capacity is 4,200 BTU/h (19,700 at 8 °C). It slows down instead of cycling on and off.
According to NEEP, its certified heating capacity at −15 °C (5 °F) is 35,000 BTU/h, 106% of its nominal 33,000 BTU size. Its COP there is 1.98.
Data read live from the airgreen.ca page of each size (NEEP / AHRI certified performance). When the title names the installed size, it is highlighted; otherwise the whole range is shown. The aid shown is today’s, using Hydro-Québec’s rule ($120 per 1,000 BTU/h at −8 °C); amounts quoted in the article date from its publication. Only Hydro-Québec confirms the assistance granted.A dash in the aid column: amount to be confirmed for this model.
And at your place?
Two quick checks with real numbers: what heat costs, and what your current heaters add up to in BTU/h.
Baseboards and electric furnaces turn 1 kWh of electricity into 1 kWh of heat. A heat pump delivers more: that is its COP. At Hydro-Québec’s rate D (11.142¢/kWh above 40 kWh a day, since 1 April 2026):
Hydro-Québec: a heat pump can be up to three times more efficient than baseboards for heating in the colder months.
Estimate per kWh of heat, at the chosen temperature, using the certified COP from the product page. Taxes, access charge and backup heat not included.
Conversion: 1 W = 3.412 BTU/h. An indication, not a load calculation: baseboards and furnaces are often stronger than the real need, and they can stay as backup. AirGreen confirms the capacity on site.
What to do, season by season
Three habits per season for this unit. They take a few minutes and prevent many calls.
- Clean the indoor unit's filters.
- Clear leaves and debris left on the outdoor unit by winter.
- Test cooling before the first hot days.
- Clean the filters more often when the unit runs a lot.
- Keep plants away from the outdoor unit.
- Check that no water drips from the indoor unit.
- Rake the leaves around the outdoor unit.
- Test heating before the first cold days.
- Book periodic maintenance before winter.
- Keep snow away from the stand and the front of the unit.
- Let the unit defrost: it is normal.
- Never hit the ice on the fins; call us if the unit stays iced up.
Which type of equipment for your project?
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Four mistakes we do not make
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What people ask us about this kind of work
Does a wall-mounted heat pump heat in winter?
Wall-mounted or multi-zone: how do I choose?
Where does the outdoor unit go?
Are there grants?
Do I need a permit?
How cold can it heat?
How much can I save?
How is the LogisVert assistance calculated?
Is it noisy?
The outdoor unit is covered in ice: is that normal?
Does AirGreen hold the required licences?
Is the estimate free?
No question matches. Write to us: we answer.
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Text and photo: a real AirGreen Climatisation & Chauffage job. The diagrams are generic illustrations of the type of installation, not a survey of this job site. Sources of the added figures: airgreen.ca product pages (NEEP / AHRI performance), Hydro-Québec (Heat pumps page, LogisVert, read on 13 October 2026), Régie de l’énergie (rate D as of 1 April 2026).