In Saint-Édouard, a MIDEA35 installed where comfort really comes into play: in the distribution of air
A wall-mounted heat pump can deliver excellent performance on a specification sheet and still provide disappointing comfort if its indoor unit is placed without considering the room’s geometry. Our installation of a MIDEA MIDEA35 in Saint-Édouard highlights precisely this part of the work that remains invisible when simply comparing two prices: the precise choice of location for the wall-mounted indoor unit.
In the photo of this project, the Midea indoor unit is installed high on the wall, near the ceiling, with an adjacent wall on the left and a window with a curtain rod on the right. The available surface was therefore clearly defined. Our goal was to integrate the unit neatly into this space while maintaining effective airflow and avoiding visual clutter in the room.
The result is particularly clean: the MIDEA35 wall-mounted heat pump occupies the upper section of the wall, its white casing blends into the interior finish, and no exposed piping crosses the room along the visible portion of the installation.
This apparent simplicity nevertheless requires several technical decisions. The height must be determined, the movement of the louvers anticipated, natural air circulation taken into account, the drain and refrigerant lines routed, and the unit kept accessible for future HVAC maintenance.
Why install the indoor unit high on the wall?
The high positioning of a wall-mounted air conditioner with heat pump function is primarily based on airflow circulation.
In cooling mode, cooled air tends to descend. A unit installed high on the wall can therefore project air into the room before it gradually descends and mixes with the ambient air.
In heating mode, the strategy changes slightly. The louvers can direct the airflow to promote comfortable distribution of warm air. A proper installation therefore relies not only on the temperature set with the remote control: the direction and speed of the airflow play a major role in the perception of comfort.
The MIDEA35 is particularly interesting in this regard. Midea provides very fine ventilation modulation and several airflow management functions. The documentation specifically presents the fan speed adjustment from 1% to 100%as well as horizontal and vertical oscillation.
In a room like the one photographed in Saint-Édouard, this level of control makes it possible to adapt airflow to the furniture, windows, and the way the space is actually used.
An installation near the ceiling that must remain methodical
Installing a wall-mounted unit very high does not simply mean placing it “as close as possible” to the ceiling.
Our technicians must comply with the prescribed clearances, maintain sufficient space around the unit for air circulation, and provide the necessary access for cleaning or servicing.
At this site in Saint-Édouard, the available space above allows for compact integration. The wall corner on the left and the curtain rod on the right naturally frame the installation area.
Before securing it, several elements must be checked:
- the strength of the wall and the mounting plate's attachment;
- the possibility of creating an adequate slope for the condensate drain;
- the route of the refrigerant lines;
- the position of the communication cable;
- the absence of obstacles to louver movement;
- future accessibility to the filters and internal components;
- the direction of the airflow relative to the occupied area.
It is precisely in these details that a professional wall-mounted heat pump installation stands out from an installation carried out solely based on the easiest place to drill.
The visual result is part of the installation quality
A wall-mounted heat pump remains visible twelve months a year.
We therefore consider visual integration a genuine component of the HVAC project. In this Saint-Édouard room, the white unit against the white wall maintains a discreet presence. The connections do not dominate the wall, and the installation remains consistent with the existing finish.
This is particularly important when a heat pump is installed in a bedroom, living room, office, or room where occupants spend several hours a day.
A poorly planned line-set route can function technically while leaving several feet of line-hide in a highly visible location. Instead, when the building's structure allows, we aim to organize the connections logically from the very beginning of the project.
MIDEA35: three different capacities, not a single heat pump
The term MIDEA35 refers to a series rather than a single capacity.
The range presented by Midea includes, among other things, systems with 9,000, 12,000, and 18,000 BTU/h in cooling mode. The exact combination references are:
- MSESU-H09B-2A with MO1SS-H09B-2A — 9,000 BTU, AHRI 215471386;
- MSESU-H12B-2A with MO1SS-H12B-2A — 12,000 BTU, AHRI 215471387;
- MSESU-H18B-2A with MO1SS-H18B-2A — 18,000 BTU, AHRI 215471388.
The indoor photo of our installation in Saint-Édouard does not make it possible to read the nameplate or confirm with certainty which of these three capacities was selected. We therefore prefer not to arbitrarily assign a capacity to the project.
This distinction is important for consumers. Two units bearing the MIDEA35 name may have different performance, piping, electrical requirements, and subsidy amounts.
SEER2 ratings that vary by capacity
The MIDEA35 series reaches particularly high efficiency levels:
| Rated cooling capacity | SEER2 | HSPF2 IV | Rated heating | Heating at -15 °C |
|---|---|---|---|---|
| 9,000 BTU/h | 33,3 | 22,0 | 12,000 BTU/h | 13,500 BTU/h |
| 12,000 BTU/h | 29,4 | 14,5 | 12,000 BTU/h | 13,500 BTU/h |
| 18,000 BTU/h | 25,6 | 16,2 | 20,000 BTU/h | 22,600 BTU/h |
These data come from the technical table for the MIDEA35 series provided by Midea.
However, the highest number is not automatically the best choice for every home.
For example, installing a larger unit solely with the idea of “getting more BTUs” can hurt cooling quality if the actual load of the room is much lower. Sizing must take into account the area, as well as insulation, sun exposure, the number of windows, ceiling height, adjacent floors, and room layout.
At AirGreen, we therefore attach just as much importance to heat pump sizing than the performance listed on its technical data sheet.
Heating down to -30 °C: an important feature for Saint-Édouard
The three MIDEA35 configurations presented by the manufacturer have a heating operating range down to -30 °C.
For a residence in Saint-Édouard, as well as for our projects in Montreal, Laval, Longueuil, the North Shore, and the South Shore, this feature changes how a heat pump can be used.
We are no longer simply talking about an air conditioner capable of providing a little heating during the fall. A heat pump designed for low temperatures can contribute to heating for a much larger portion of the Quebec winter.
However, an essential distinction must be made between minimum operating temperature and actual capacity available at that temperature.
The statement “down to -30 °C” means that the equipment is designed to continue operating under these conditions. It does not mean that the heat pump will produce exactly the same amount of heat at -30 °C as it does at +5 °C.
That is why we also review low-temperature performance tables when sizing a system.
Variable-speed technology to prevent abrupt cycling
The MIDEA35 uses variable-speed technology. Instead of operating only at full capacity and then stopping, the compressor can modulate its operation according to the heating or cooling demand.
Midea explains that this modulation allows the compressor to adjust its operation as needs change and helps maintain a more stable indoor temperature.
In practice, this feature is particularly useful in a room where demand varies throughout the day.
The sun can warm a window in the afternoon. A door may open frequently. Several people may occupy the room for a few hours. The heat load is never perfectly constant.
A variable-capacity heat pump can respond to these changes much more precisely than an older system operating solely according to an on-off logic.
An indoor unit designed to be quiet
Acoustic comfort matters enormously for a unit installed directly in a living space.
Depending on the selected capacity, MIDEA35 documentation indicates indoor sound levels that can drop to approximately 19 dB(A) for the 9,000 and 12,000 BTU models and 16 dB(A) for the 18,000 BTU model at the quietest settings.
This is particularly relevant for an installation like the one shown in the photograph, where the unit is located directly in the occupied space rather than in an isolated mechanical room.
The noise level actually perceived will obviously depend on the selected mode, fan speed, required output, and the room’s acoustics.
Dimensions that explain why the location must be chosen before ordering
The 9,000 and 12,000 BTU versions of the MIDEA35 use an indoor unit measuring approximately 37.99 in wide, 9.41 in deep, and 12.56 in high according to the Quebec brochure. The 18,000 BTU version is larger, at approximately 44.88 in wide, 10.83 in deep, and 14.57 in high.
These dimensions are important when the installation must be carried out between a wall corner, a window, a door, or an upper cabinet.
In the Saint-Édouard project, the photograph clearly illustrates this type of situation: the upper section of the wall is laterally constrained by the room’s architecture. It is therefore preferable to know the unit’s actual width before finalizing its location.
What this MIDEA35 installation in Saint-Édouard can teach a homeowner before signing a quote
The drain route deserves just as much attention as the refrigerant lines.
In air conditioning, the indoor unit removes moisture from the air. This water must be drained through a properly installed drain.
Insufficient slope, a crushed pipe, or improper routing can eventually cause backflow, dripping beneath the unit, or damage to the interior finish.
When choosing the position of a wall-mounted indoor unit, we therefore never look only at its front. We need to know what is happening behind the wall and to the outdoor exit point.
In a well-planned installation, the drain and line route is determined before the unit is permanently secured.
The pipe diameters are not the same for all MIDEA35 systems
The difference between capacities continues on the refrigeration side.
For the 9,000 and 12,000 BTU MIDEA35 systems, Midea specifies liquid/gas lines of 1/4 in and 3/8 in. For the 18,000 BTU version, the diameter increases to 3/8 in and 5/8 in.
The indicated maximum lengths are 82 ft for the 9,000 and 12,000 BTU systems and 164 ft for the 18,000 BTU version.
This is another reason never to consider the lines as a simple interchangeable accessory between any heat pumps.
The electrical circuit must correspond to the exact combination
The three systems operate on a 208/230 V, single-phase, 60 Hz, but their protection requirements are not identical.
The brochure states:
- MIDEA35 9,000 BTU: minimum allowable ampacity of 16 A, maximum protection of 20 A;
- MIDEA35 12,000 BTU: 16 A, maximum protection of 20 A;
- MIDEA35 18,000 BTU: 24.9 A, maximum protection of 25 A.
We therefore check the electrical panel and available circuit before installation. A heat pump should never be selected simply by assuming that an existing circuit breaker will be suitable.
R-454B and new installation practices
The MIDEA35 uses R-454B refrigerant, classified as A2L. The manufacturer also incorporates leak detection and A2L refrigerant dispersion functions into this product family.
This implies installation and service methods adapted to this generation of equipment.
For the homeowner, the practical consequence is simple: the installer’s expertise is even more important. Handling, evacuation, connection, commissioning, and maintenance procedures must correspond to the refrigerant and the installed equipment.
Airflow control, humidity, and everyday functions
The MIDEA35 series is not limited to heating and cooling modes.
The manufacturer notably offers:
- the night mode;
- mode ECO;
- fine fan speed adjustment;
- function Follow Me;
- horizontal and vertical oscillation;
- timer;
- child lock;
- automatic cleaning;
- silent mode;
- maintaining heating at 8°C;
- humidity management;
- the option of using a wired controller;
- intelligent control according to the configuration.
The “Follow Me” function is particularly interesting when the temperature near the indoor unit is not exactly the same as in the occupied area. The manufacturer indicates that the temperature sensor built into the remote control can be used as a reference to improve control accuracy.
A design that also makes future cleaning easier
A feature that is less spectacular in a brochure but highly relevant to us concerns access to the blower wheel.
Midea indicates that the indoor unit's blower wheel can be removed to facilitate deeper cleaning of the appliance.
For wall-mounted heat pump maintenance, this access matters a great deal.
Over the years, dust and deposits can accumulate not only on the filters, but also on the coil, fan, and internal surfaces. A design that provides better access simplifies the work when thorough cleaning becomes necessary.
LogisVert: verify the capacity and AHRI number, not just the MIDEA35 name
Financial assistance must be addressed precisely.
Hydro-Québec states that, for heat pumps installed on or after November 26, 2025, the equipment must notably be certified ENERGY STAR to be eligible for the LogisVert program. Hydro-Québec also specifies that eligible models and amounts may vary and that the list corresponding to the installation date must be consulted.
The AirGreen product sheets currently published indicate, among other things:
- MIDEA35 9,000 BTU, AHRI 215471386: ENERGY STAR and cold-climate certified, but LogisVert subsidy currently listed at 0 $;
- MIDEA35 12,000 BTU, AHRI 215471387: LogisVert subsidy currently listed at 1 320 $;
- MIDEA35 18,000 BTU, AHRI 215471388: LogisVert subsidy currently listed at 2 316 $.
Since the photograph of this installation in Saint-Édouard does not make it possible to identify the installed capacity with certainty, we cannot assign a specific amount to this project based solely on the image.
This is a good practice to keep in mind: the amount of a subsidy must always be associated with the exact combination of models, the AHRI number, the installation date, and the program conditions, rather than simply by brand or series.
A warranty to be verified along with the model number
The Midea brochure presents, for the residential sector, a limited warranty program of up to 12 years on the compressor, 12 years on parts, and 10 years on labor, according to the manufacturer's applicable terms.
Since the terms may depend on registration, the distribution network, and the terms of sale, we always recommend confirming the exact coverage associated with the quotation before installation.
Mistakes this installation helps avoid
When we assess a wall-mounted heat pump in Saint-Édouard, in Montréal or elsewhere in Greater Montréal, certain mistakes regularly recur in the projects homeowners ask us to assess.
The first is choosing the capacity solely according to the number of square feet.
The second is deciding on the indoor unit's location solely based on appearance, without analyzing airflow.
The third is forgetting the route of the drain and lines to the outside.
The fourth is assuming that all capacities in the same series have the same electrical requirements.
Finally, another common mistake is to consider the maximum subsidy amount guaranteed before even verifying the exact AHRI number.
Our Saint-Édouard MIDEA35 installation demonstrates a different approach: integrating the unit into the building, making intelligent use of the upper part of the wall, keeping airflow unobstructed, and treating the concealed mechanical components behind the unit with as much care as its visible finish.
AirGreen: an HVAC installation designed for the room, not just the machine
At AirGreen, when we install a MIDEA wall-mounted heat pump, our work does not begin with the drill.
We examine the room layout, openings, available walls, use of the space, and the possible routing of the connections. We then verify the capacity, electrical requirements, and refrigeration configuration before carrying out the installation.
This method is the same for our projects in Montréal, Laval, Longueuil, the North Shore, the South Shore, and Montérégie municipalities such as Saint-Édouard.
The MIDEA35 offers some very interesting technical features: heating operation down to -30 °C, refrigerant R-454B, variable-speed technology, high SEER2 ratings, precise airflow control, and several available capacities. But the quality of the result always depends on how these features are adapted to the building.
In this Saint-Édouard installation, the photo of the indoor unit perfectly reflects this philosophy: a properly sized, neatly positioned wall-mounted heat pump integrated functionally into the room, so that everyday comfort remains at the heart of the installation.