A discreet and precise installation in a room where the indoor unit’s positioning made all the difference
This MIDEA MIDEA28 wall-mounted heat pump installation in Sainte-Justine-de-Newton represents exactly the type of project where the final result looks simple, even though choosing the location requires genuine technical consideration.
In the photo of our installation, the Midea indoor unit is installed high on a light gray wall, relatively close to the ceiling and near the room’s right corner. The wall in front of the unit is largely unobstructed, allowing the air-supply louvers to distribute air throughout the space without immediately encountering a cabinet, beam, or other obstacle.
The final appearance is intentionally discreet. The heat pump’s white façade contrasts slightly with the wall while remaining visually understated, and the integrated digital display makes it easy to check the temperature while the unit is operating.
At AirGreen, we believe that a successful installation must meet three objectives simultaneously: deliver the right performance, ensure efficient airflow, and integrate cleanly into the building.
The model installed here belongs to Midea’s ductless wall-mounted system range, which includes the MIDEA35, MIDEA28, MIDEA25, and MIDEA22.
Why we chose a high installation
A wall-mounted heat pump is normally positioned in the upper part of a wall to allow conditioned air to move efficiently throughout the room.
This principle becomes even more important when a single unit must provide much of the comfort for a space.
At Sainte-Justine-de-Newton, so we looked for a location where the air outlet would remain fully unobstructed while keeping the unit accessible for future maintenance.
The positioning shown in the photo allows the unit to blow directly toward the open area of the room. The louvers can then adjust the airflow direction according to heating or cooling needs.
The MIDEA28 has several specific functions designed to control this airflow. Midea notably indicates for the MIDEA35, MIDEA28, and MIDEA25 series a fan speed setting from 1% to 100%, as well as horizontal and vertical swing, silent mode, Turbo function, and night mode.
This ability to modulate airflow is useful because a heat pump should not always operate with a strong air stream. Once the desired temperature has been reached, a lower airflow can help maintain comfort without creating a constant draft.
A Room Corner Can Be an Excellent Location When Properly Evaluated
In the photo, the MIDEA28 is relatively close to the right side wall.
This type of configuration can be very effective when the required clearances are respected and the adjacent wall does not block the unit’s intake or airflow.
We look in particular at the unit’s width, its side access, the possibility of opening the front panel, and the direction in which the louvers will need to send the air.
We also need to think about what may not necessarily appear in the photo: where will the furniture be placed after we leave? A large cabinet installed later beneath or in front of the evaporator could completely change the air distribution.
That is why we always discuss the room’s actual use with the homeowner before finalizing the location.
What looks simple on the wall rests on several hidden connections
Once the installation is complete, the homeowner mainly sees the evaporator.
Behind this finish, however, are several essential components: refrigerant lines, communication wiring, electrical connections, and condensate drainage.
One of the major advantages of a ductless heat pump is that it does not require the construction of a complete air-duct system throughout the residence. Midea explains that the indoor unit can be connected to the outdoor unit through a relatively small opening, which limits demolition, repair, and painting work.
In a home already finished in Sainte-Justine-de-Newton, this feature makes it possible to add heating and cooling while keeping the interior much more intact than with certain major ventilation modifications.
Drainage Is Part of Choosing the Location
A heat pump that provides cooling removes moisture from the indoor air.
This moisture turns into condensate and must be drained properly.
Before securing the unit, we therefore need to know how the drain will be routed. A clean route, with an appropriate slope when drainage relies on gravity, helps prevent water accumulation and drainage problems.
It is one of the elements that the homeowner almost never sees once theHVAC installation completed, but it can have a significant impact on the system’s reliability several years later.
MIDEA28: Features Particularly Well Suited to Quebec Heating
The MIDEA28 is described in the manufacturer's brochure as a premium wall-mounted “extreme heat pump” series. In the technical table on page 11, Midea indicates heating operation down to -30 °C, refrigerant R-454B, a designation Cold Climate V6.1, efficiency of up to 27.4 SEER2 as well as efficiency of up to 13.5 HSPF2 IV, depending on the selected capacity.
For a property located in Sainte-Justine-de-Newton, these winter performance figures matter just as much as summer performance.
A heat pump in Quebec must be evaluated as both a heating and cooling appliance, not simply as an air conditioner used for a few weeks each year.
The MIDEA28 is available in five different capacities
The name MIDEA28 refers to a complete series, not a single capacity.
According to the technical data sheet on page 11, the configurations range from 9,000 to 33,000 BTU/h in cooling. The listed combinations are as follows:
- 9,000 BTU/h : MSEHU-H09B-2A with MO1HS-H09B-2A, AHRI 215471380, 27.4 SEER2 and 12.5 HSPF2 IV;
- 12,000 BTU/h : MSEHU-H12B-2A with MO1HS-H12B-2A, AHRI 215471381, 25.4 SEER2 and 10.5 HSPF2 IV;
- 18,000 BTU/h : MSEHU-H18B-2A with MO1HS-H18B-2A, AHRI 215471382, 21.4 SEER2 and 11.0 HSPF2 IV;
- 24,000 BTU/h : MSEHU-H24B-2A with MO1HS-H24B-2A, AHRI 215471383, 21.0 SEER2 and 13.5 HSPF2 IV;
- 33,000 BTU/h : MSEHU-H33B-2A with MO1HS-H33B-2A, AHRI 215471384, 19.5 SEER2 and 10.5 HSPF2 IV.
The exact capacity of the unit installed in this photo cannot be read clearly enough for us to state it with certainty. We therefore prefer to present the verified specifications for the series rather than arbitrarily assigning a BTU rating to the project.
This distinction is essential when a homeowner compares multiple quotes.
Why “up to 27.4 SEER2” must be interpreted correctly
When a brochure advertises a heat pump at 27.4 SEER2, it is easy to believe that all capacities in the series have the same rating.
That is not the case.
The 9,000 BTU/h version is the one that reaches 27.4 SEER2 in the documentation provided. The other capacities achieve 25.4, 21.4, 21.0, and 19.5 SEER2, respectively.
At AirGreen, we therefore always compare the exact combination of indoor and outdoor units.
The product name is a starting point. The model number and AHRI number provide the genuinely useful information.
At -15 °C, the MIDEA28 retains significant heating capacity
To understand how a heat pump actually performs in winter, we examine, among other things, its available capacity at low temperatures.
At -15 °C, Midea indicates a nominal heating capacity of 11,500 BTU/h for the 9,000 and 12,000 BTU/h versions, 18,000 BTU/h for the 18,000 version, 24,200 BTU/h for the 24,000 version and 35,000 BTU/h for the 33,000 version.
All MIDEA28 configurations in this document are rated to operate in heating mode down to -30 °C.
This information provides an important distinction: a minimum operating temperature alone does not indicate how much heat the unit will provide at that temperature.
When we select a heat pump in Sainte-Justine-de-Newton, we must therefore take the residence’s actual heating needs into account.
Why We Avoid Oversizing “As a Safety Measure”
Simply choosing the largest heat pump possible is not necessarily advantageous.
The appropriate capacity depends in particular on the floor area, insulation, windows, wind exposure, ceiling height, room layout, and heat loss.
A rural or semi-rural home may also be more exposed to wind than a dwelling surrounded by urban buildings, which can affect the heating load.
Good sizing therefore seeks a balance between the capacity required during cold periods and the unit’s ability to modulate properly during milder conditions.
Variable-speed technology improves comfort stability
Midea explains that its variable-speed technology allows the compressor to adjust its operation as demand changes, rather than simply switching between on and off.
This modulation helps limit temperature fluctuations and maintain more consistent comfort.
This is particularly useful in a room such as the one at our installation in Sainte-Justine-de-Newton.
Once the set temperature is reached, the heat pump can reduce its operating level rather than continue constantly at maximum capacity.
Up to 100 airflow levels
Indoor fan control is another interesting feature of this range.
Midea indicates that the wall-mounted unit offers 100 continuously adjustable airflow levels. The manufacturer also mentions remote control using SmartHome and Wi-Fi when these features are configured on the unit.
Page 15 of the brochure also shows that the remote control can be used to select AUTO, cooling, dry, heating, and fan modes, as well as different fan speeds and functions such as ECO/GEAR, timer, and BOOST.
Quiet indoor operation
Acoustic comfort is very important when the unit is located in a bedroom, living room, or workspace.
For the MIDEA28, the documentation indicates very different indoor sound levels depending on capacity and fan speed. The 9,000, 12,000, and 18,000 BTU/h versions can go as low as approximately 19.5 dB(A) in the specified silent setting, while the 24,000 BTU/h version is rated at up to 16 dB(A).
This feature allows the heat pump to maintain a comfortable temperature without necessarily becoming the dominant sound source in the room.
R-454B: an important technical detail for this generation of Midea
The MIDEA28 uses R-454B refrigerant. The brochure also indicates features related to A2L refrigerant leak detection and a dispersion system intended for the applicable series.
This detail influences commissioning practices, work methods, and the equipment used by technicians.
For the homeowner, these aspects remain largely invisible. For us, they are an integral part of a professional installation.
Pipe diameters change significantly depending on the capacity
The MIDEA28 perfectly illustrates why we never automatically reuse an old refrigerant circuit without verification.
Depending on the capacity, Midea requires 1/4 in – 3/8 in, 1/4 in – 1/2 in, 3/8 in – 5/8 in or even 3/8 in – 3/4 in. The maximum length ranges from 82 ft to 164 ft, with a maximum elevation difference of up to 82 ft on the larger versions.
This means that two heat pumps both bearing the MIDEA28 name can have very different installation requirements.
Same goes for the electrical requirements
The documented MIDEA28 units use a 208/230 V single-phase, 60 Hz power supply, but the required amperage varies with capacity. The technical data sheet indicates a minimum allowable ampacity of 15 A on the 9,000 and 12,000 BTU/h versions, 19 A on the 18,000, 24.9 A on the 24,000, and 34 A on the 33,000 BTU/h versions. The indicated maximum overcurrent protection ratings are 15, 15, 20, 25, and 35 A, respectively.
We therefore always verify the exact model before determining the required electrical circuit.
And the LogisVert subsidy?
The documentation provided confirms that the MIDEA28 configurations shown are associated with specific AHRI numbers and the designation Cold Climate V6.1.
However, it does not, on its own, provide an applicable LogisVert subsidy amount for this Sainte-Justine-de-Newton installation.
To determine financial assistance, the exact combination installed, its AHRI number, its capacity relevant to the program calculation, as well as the criteria in effect on the project date.
We therefore prefer to confirm the amount based on this information rather than turn a brochure feature into a subsidy promise.
Future maintenance is part of a good installation
The photographed unit remains relatively accessible on its unobstructed wall.
This is important because the filters will need to be removed and cleaned periodically.
Midea also indicates that the blower wheel on the MIDEA35, MIDEA28, and MIDEA25 series can be removed to facilitate more thorough cleaning of the inside of the unit.
When an evaporator is placed too close to an architectural feature, this type of work can become much more complicated. Service access must therefore be anticipated from the outset.
The errors we want to avoid with a wall-mounted heat pump
In an installation like this, our checks focus in particular on the following errors: choosing a capacity based solely on square footage, installing the evaporator in a poor airflow direction, neglecting drainage, reusing piping without checking its diameters, selecting the electrical supply based on an approximate rule, or placing the unit so close to a ceiling or wall that it becomes difficult to service.
The final photo shows none of these calculations. Yet they are what allow the installation to remain reliable once the tools have left the home.
A residential warranty to consider when making the decision
The Midea brochure presents a 12-year limited warranty on the compressor, 12 years on parts, and 10 years on labor, according to the terms and conditions applicable to the warranty program.
We recommend keeping the receipt, model and serial numbers, and product registration information.
This project in Sainte-Justine-de-Newton effectively summarizes our approach at AirGreen
This MIDEA28 heat pump installation in Sainte-Justine-de-Newton does not stand out because of extensive interior work.
Its strength lies precisely in its final simplicity.
The unit is installed high on a clear wall, with a clean front panel and an open discharge area. The corner of the room was used without making the unit visually dominant, and the location remains compatible with its operation and maintenance.
Behind this result are the decisions that define our work at AirGreen : choose the right capacity, check the refrigerant line route, plan the drainage, confirm the electrical supply, consider air circulation, and preserve access to the components.
We apply the same method to our wall-mounted heat pumps in Montreal, Laval, Longueuil, on the North Shore, and on the South Shore, while adapting each installation to the building’s specific characteristics.
The MIDEA28 offers an interesting technical foundation for Quebec’s climate: heating advertised down to -30 °C, five available capacities, variable-speed technology, precise airflow control, R-454B refrigerant, and Cold Climate V6.1 configurations.
But a heat pump’s specifications only reach their full value when they are accompanied by a heat pump installation designed for the actual home where it will operate.