In Pincourt, an MIDEA28 installed in a restricted section of wall, between a door, the ceiling, and a corner of the room
This MIDEA MIDEA28 wall-mounted heat pump installation in Pincourt clearly shows why the positioning of an indoor unit deserves as much attention as the choice of the machine itself. In the project photo, the Midea evaporator is installed in the upper part of a wall, with a door frame immediately to the left and a nearby room corner on the right. The available surface was therefore clearly defined.
In such a configuration, a few inches become important.
We must find a location that allows good air distribution, reasonable access to the unit for theHVAC maintenance, a logical route for the refrigerant lines and drain, as well as a clean integration into the room.
At AirGreen, we installed a MIDEA28, a series of ductless wall-mounted heat pumps that Midea positions above its MIDEA25 and MIDEA22 product lines. The manufacturer’s brochure groups the MIDEA35, MIDEA28, MIDEA25, and MIDEA22 series in its ductless wall-mounted systems line.
The visible result in Pincourt appears simple: a white unit installed high on the wall with its air-discharge louvers directed toward the room. But behind this simplicity, several technical decisions were necessary.
A wall-mounted installation where the available width had to be used precisely
In our photo, the left side of the heat pump is relatively close to the door frame. On the right, the wall ends at the corner of the room. The unit is also positioned in the upper part of the wall.
This type of situation requires us to work with the building’s actual geometry rather than with a theoretical location.
The goal is not to artificially center the heat pump on the wall. Rather, we seek to position the unit where it will to draw in and distribute air properly, while respecting the mounting and service requirements of the installed model.
Why the indoor unit is generally installed high
A wall-mounted heat pump is designed to distribute air from the upper part of the room.
In cooling mode, this arrangement allows cooled air to be projected into the area and then gradually descend. In heating mode, the louver orientation can be adjusted to direct more warm air toward the occupied part of the room.
The MIDEA28 specifically offers functions for detailed control of airflow. The manufacturer indicates that the MIDEA35, MIDEA28, and MIDEA25 series feature adjustable fan speed from 1% to 100%, as well as horizontal and vertical oscillation, silent mode, night mode, and several comfort-management functions.
On a wall where placement is limited, this ability to adjust air circulation becomes particularly useful.
Airflow should not be considered only at the time of installation
A common mistake is to look only at whether the evaporator “fits” in the available space.
Instead, we consider what will happen when the machine is running.
In particular, check whether:
- a piece of furniture may end up in front of the air outlet;
- the adjacent door affects air circulation;
- a partition blocks part of the range;
- the occupied area receives a direct and uncomfortable stream of air;
- the front panel and filters can still be opened;
- the airflow can reach the useful part of the room sufficiently.
Midea documentation indicates that its wall-mounted units offer up to 100 air-volume adjustment levels, allowing much finer fan modulation than a system limited to a few preset speeds. The SmartHome app and Wi-Fi also enable remote control when the applicable configuration allows it.
A clean installation also involves what is behind the unit
The photo shows the completed indoor portion of the project. The lines do not dominate the wall, giving the installation a relatively discreet appearance.
Yet, a ductless heat pump requires several essential connections between the evaporator and the outdoor condenser:
- refrigerant lines;
- communication wiring;
- electrical connections;
- condensate drainage.
Midea emphasizes that a ductless system allows the indoor and outdoor units to be connected without building a complete ventilation network. The brochure indicates that a relatively small opening in the wall is enough to run the necessary connections, helping limit demolition and finishing work.
For many homeowners Pincourt and Vaudreuil-Soulanges, which is precisely what makes a wall-mounted heat pump appealing when modernizing heating and air conditioning.
The condensate drain deserves as much attention as the refrigerant lines
When the MIDEA28 operates in cooling mode, the indoor coil removes moisture from the air.
This water must be discharged.
The drain route is therefore part of the location planning. When gravity drainage is possible, we look for a route with an adequate slope and minimize points where water could stagnate.
This detail remains invisible in the final photo, but it is one of the elements that distinguish an installation designed simply to start up on the day of the work from an HVAC installation designed to operate properly over the long term.
The MIDEA28 uses the new R-454B refrigerant
The MIDEA28 series documented by Midea operates with R-454B, an A2L-class refrigerant.
The range documentation also indicates the presence of features related to A2L refrigerant leak detection and the dispersion system provided on the applicable series.
This directly influences the professional practices used during installation and servicing.
For the homeowner, the heat pump remains very simple to operate. For our technicians, however, the refrigerant type affects procedures related to the refrigeration circuit, leak testing, evacuation, and commissioning.
Why the MIDEA28 is a particularly attractive option for Pincourt’s climate
Midea describes the MIDEA28 as a an advanced wall-mounted series and a heat pump designed for extreme cold conditions. The brochure indicates performance of up to 27.4 SEER2, up to 13.5 HSPF2 IV, using R-454B refrigerant and offering a heating operating range of up to -30°CIt also identifies the series as Cold Climate V6.1.
However, these figures must be read correctly.
“Up to 27.4 SEER2” does not mean that all MIDEA28 units have a SEER2 of 27.4. The series is available in several capacities, and each combination has its own performance ratings.
Five MIDEA28 capacities to meet very different needs
The documented MIDEA28 range includes five rated cooling capacities:
| Capacity | Indoor model | Outdoor model | SEER2 | HSPF2 IV | AHRI |
|---|---|---|---|---|---|
| 9,000 BTU/h | MSEHU-H09B-2A | MO1HS-H09B-2A | 27,4 | 12,5 | 215471380 |
| 12,000 BTU/h | MSEHU-H12B-2A | MO1HS-H12B-2A | 25,4 | 10,5 | 215471381 |
| 18,000 BTU/h | MSEHU-H18B-2A | MO1HS-H18B-2A | 21,4 | 11,0 | 215471382 |
| 24,000 BTU/h | MSEHU-H24B-2A | MO1HS-H24B-2A | 21,0 | 13,5 | 215471383 |
| 33,000 BTU/h | MSEHU-H33B-2A | MO1HS-H33B-2A | 19,5 | 10,5 | 215471384 |
The rated heating capacity corresponds respectively to 12,000, 12,000, 18,000, 29,000, and 36,000 BTU/h.
A photo of our installation at Pincourt does not show a rating plate that would make it possible to confirm with certainty which of these five capacities was installed. We therefore prefer to present the verifiable specifications for the entire series rather than inventing a BTU figure.
Performance at -15°C gives a better idea of winter capabilities
For a Quebec homeowner, looking only at the nominal output in mild weather provides an incomplete picture.
At -15°C, Midea lists the MIDEA28's nominal heating capacity as:
- 11,500 BTU/h for the 9,000 BTU model;
- 11,500 BTU/h for the 12,000 BTU model;
- 18,000 BTU/h for the 18,000 BTU model;
- 24,200 BTU/h for the 24,000 BTU model;
- 35,000 BTU/h for the 33,000 BTU model.
All five configurations are advertised for heating operation down to -30°C.
These figures are particularly relevant at Pincourt, where a heat pump is expected to operate throughout a true heating season rather than only during a few cool nights.
“Operates down to -30°C” does not mean “the same performance at all temperatures”
This distinction is fundamental when comparing two heat pumps.
The minimum temperature indicates the stated operating limit. However, the system's available capacity and efficiency may change as the outdoor temperature drops.
That is why we review technical tables and low-temperature performance rather than comparing only large figures in advertisements.
Sizing remains more important than the maximum number of available BTUs
The MIDEA28 is available up to 33,000 BTU/h in cooling, but this obviously does not mean that the largest version is suitable for every property.
At AirGreen, we analyze in particular:
- the area actually served;
- the insulation level;
- the windows;
- the home's exposure;
- ceiling height;
- the layout of the rooms;
- air infiltration;
- heat losses;
- the existing heating system.
A properly sized heat pump can modulate its operation more effectively and maintain comfort better than a unit chosen simply because it has greater capacity.
Variable-speed technology helps maintain a more stable temperature
Midea uses variable-speed technology that allows the compressor to adjust its operation according to demand.
The documentation explains that the system can operate more continuously by modulating its capacity rather than switching only between on and off. Midea associates this strategy with reduced temperature fluctuations and more stable comfort.
In practice, this means that after bringing the room close to the desired setpoint, the heat pump can adjust its operation rather than running constantly at maximum capacity.
A quiet range suited to occupied rooms
Indoor sound levels vary according to the MIDEA28 capacity.
Midea indicates, in particular:
- approximately 19.5 dB(A) at the quiet setting for the 9,000 BTU version;
- 19.5 dB(A) for the 12,000 BTU model;
- 19.5 dB(A) for the 18,000 BTU model;
- up to 16 dB(A) for the 24,000 BTU model;
- approximately 29.5 dB(A) for the 33,000 BTU model at the specified quiet setting.
Acoustic comfort is particularly relevant when a wall-mounted heat pump is located near a bedroom, living room, or workspace.
The piping changes considerably depending on the selected capacity
This is one of the most important technical details of the MIDEA28.
Depending on the model, Midea specifies:
| Capacity | Liquid/gas lines | Maximum length | Maximum height difference |
| 9,000 BTU | 1/4 in – 3/8 in | 82 ft | 49.2 ft |
| 12,000 BTU | 1/4 in – 3/8 in | 82 ft | 49.2 ft |
| 18,000 BTU | 1/4 in – 1/2 in | 98.4 ft | 65.6 ft |
| 24,000 BTU | 3/8 in – 5/8 in | 164 ft | 82 ft |
| 33,000 BTU | 3/8 in – 3/4 in | 164 ft | 82 ft |
These differences explain why it is risky to assume that existing piping can be reused simply because a heat pump was already installed.
We must confirm the diameter, condition, and compatibility of the lines with the new equipment.
Electrical requirements also vary with capacity
All documented MIDEA28 configurations operate at 208/230 V, single-phase, 60 Hz.
For the outdoor unit, Midea indicates the following values:
- 9,000 BTU: minimum permissible amperage of 15 A, maximum protection of 15 A;
- 12,000 BTU: 15 A, maximum protection of 15 A;
- 18,000 BTU: 19 A, maximum protection of 20 A;
- 24,000 BTU: 24.9 A, maximum protection of 25 A;
- 33,000 BTU: 34 A, maximum protection of 35 A.
We therefore size the circuit according to the exact combination installed and the equipment specifications, rather than applying a universal rule based solely on BTUs.
LogisVert: what can actually be stated about the MIDEA28
The Midea brochure identifies the five MIDEA28 configurations as Cold Climate V6.1 and provides a separate AHRI number for each one.
However, this brochure alone is not sufficient to confirm the eligibility of a specific installation for LogisVert.
Hydro-Québec currently indicates that a heat pump ENERGY STAR certified and designed for cold climates may receive, when all requirements are met, financial assistance from $120 per 1,000 BTU/h of capacity at -8°C. The amount is determined according to the installation date.
Since the changes made to the program, Hydro-Québec also specifies that eligibility is based on the applicable ENERGY STAR certification and on equipment recognized under the program.
For a MIDEA28 project in Pincourt, the proper method is therefore to check the exact AHRI number of the installed combination, its ENERGY STAR – Cold Climate status, and its inclusion in the eligible data at the time of the project.
We are deliberately avoiding announcing a precise amount for this installation until the exact capacity and heating output at -8°C have been confirmed.
Comfort features that can be useful every day
The MIDEA28 shares several practical features with Midea’s other higher-end series:
- fan speed adjustment 1% to 100%;
- ECO mode;
- Turbo function;
- sleep mode;
- timer;
- function Follow Me function;
- automatic cleaning;
- silent mode;
- 8°C heating;
- horizontal and vertical swing;
- Wi-Fi control;
- smart sensor;
- humidity control;
- wired control option.
The function Follow Me, for example, uses the remote control’s temperature sensor to provide a reading that better corresponds to where it is located.
This is useful when the evaporator is installed high on the wall, as in this Pincourt installation, since there may be a difference between the temperature around the unit and the temperature felt lower down in the room.
Future maintenance was part of our thinking from day one
The photo shows the unit fairly high on the wall, but its front panel must still be able to open to access the filters.
This is important because the filters should be cleaned regularly.
For the MIDEA35, MIDEA28, and MIDEA25 series, Midea also indicates that the ventilation wheel can be removed to facilitate a more thorough cleaning of the inside of the unit.
When choosing the location of a heat pump, we therefore do not think only about the installation that very day. We must also think about the technician who may eventually have to carry out a HVAC maintenance, an inspection, or a repair several years later.
The mistakes this Pincourt project helps avoid
Choosing the location solely because the unit fits there
You must also consider the intake, discharge, drain, lines, and access for servicing.
Mistaking MIDEA28 for a single capacity
The series ranges from 9,000 to 33,000 BTU/h, and each configuration has different performance.
Compare only the maximum advertised SEER2
The 27.4 SEER2 rating belongs to a specific configuration. The other capacities have their own values.
Forget about winter performance
In Pincourt, the capacity at -15 °C is essential data when analyzing a heat pump.
Reuse old piping without verification
The five MIDEA28 versions use four different combinations of pipe diameters.
Automatically announce a subsidy
The certification, AHRI number, capacity at -8 °C, installation date, and LogisVert criteria must be verified before confirming the amount.
Residential warranty stated in Midea’s documentation
The brochure provided indicates a 12-year limited warranty on the compressor, 12 years on parts, and 10 years on labor, subject to the conditions applicable to the warranty program.
As always, we recommend keeping the invoice, model and serial numbers, as well as the equipment registration documentation.
What this Pincourt installation represents for us at AirGreen
This project is not spectacular because it required completely transforming the room. It is interesting for the opposite reason: we integrated a MIDEA28 in a relatively restricted wall area while maintaining a discreet and functional indoor installation.
The door on the left, the ceiling above, and the wall angle on the right defined the available space. We therefore had to make the room’s geometry, the connection routing, and the system’s requirements work together.
That is exactly our approach at AirGreen for a heat pump installation in Pincourt : we never look only at the machine.
We look at the house.
We check the location, required capacity, electrical circuit, refrigerant piping, drainage, air distribution, and future accessibility.
The MIDEA28 one, for its part, offers several features that are particularly relevant in Quebec: heating rated down to -30 °C, variable-speed technology, R-454B, five available capacities, precise airflow control, and cold-climate certifications indicated by the manufacturer.
A good heat pump delivers the possible performance. A good HVAC installation turns this performance into real comfort, summer after summer and winter after winter.