A particularly compact MIDEA35 installation in a limited wall space in Saint-Patrice-de-Sherrington
In Saint-Patrice-de-Sherrington, this installation of MIDEA35 wall-mounted heat pump illustrates perfectly an aspect of our work at AirGreen that often goes unnoticed once the project is complete: successfully integrating a heating and cooling unit into a confined space without compromising its operation, accessibility, or finish quality.
The photograph taken after our work shows a MIDEA indoor unit installed very close to the ceiling and also near a side wall. The available space was therefore far from unlimited. It is precisely in this type of situation that positioning must be carefully considered even before the mounting plate is secured.
The result is intentionally simple: a white wall-mounted heat pump, installed high on the wall, with an unobstructed front and an air discharge louver that can open properly. The unit blends naturally with the room’s light color and takes up no usable space around the furniture.
What may look visually simple is nevertheless based on several checks: clearance around the unit, air circulation, line routing, condensate drainage, accessibility for maintenance, and compliance with the technical specifications of the installed MIDEA35 combination.
Making the most of a small space without installing the heat pump “at random”
In many homes Saint-Patrice-de-Sherrington, as elsewhere in Greater Montreal and Montérégie, it is not always possible to choose a completely empty large wall for installing a heat pump.
Windows, doors, cabinets, trim, furniture, and structural constraints often reduce the number of possible locations.
In this installation, the indoor head occupies a very high area of the wall. We therefore had to consider the following simultaneously:
- the distance between the unit and the ceiling;
- the proximity of the side wall;
- the full opening of the air discharge louver;
- air circulation entering through the upper part of the unit;
- future access for cleaning the filters;
- the path of the refrigerant lines;
- condensate water drainage;
- the possibility of carrying out a later HVAC maintenance without having to dismantle parts of the room.
A wall-mounted heat pump needs space to operate properly. Placing it very high can be advantageous for air distribution, but an installation that is too tight can become problematic if it prevents the upper panel from opening or reduces air intake.
Our approach is therefore to use the available space precisely rather than simply seeking the highest possible position.
What the photo reveals about this installation
The close-up view allows several interesting details to be observed.
The indoor unit is installed horizontally, with the characteristic white front panel of the MIDEA range. The large lower louver is partially open, showing the space through which the conditioned air is distributed throughout the room.
On the right side of the unit, we can also see the circular element associated with this range's smart functions.
The official MIDEA brochure indicates that the MIDEA35, MIDEA28, and MIDEA25 can be equipped with a smart sensor and dual temperature and humidity control. It also mentions a detection system associated with A2L refrigerant.
The photographed installation also shows a very clean finish: no long decorative molding crosses the visible part of the wall. In a small room, this kind of detail contributes greatly to the system's visual integration.
Why air circulation is particularly important here
A wall-mounted heat pump must not only be able to produce enough heating or cooling. It must also be able to distribute that energy throughout the room.
The elevated positioning generally helps cold air mix with the surrounding air in summer. In heating mode, the louver direction becomes particularly important because warm air naturally tends to rise.
The MIDEA range offers continuous adjustment of the airflow volume. According to the manufacturer's documentation, the unit can offer up to 100 fan speed levels, allowing the airflow to be adjusted more precisely to the desired comfort level.
For an installation like this in Saint-Patrice-de-Sherrington, this modulation is useful because it allows the airflow to be reduced once the temperature has stabilized or, conversely, increased when a faster adjustment is needed.
MIDEA35: a series designed for extreme-cold heating
The MIDEA35 belongs to the premium wall-mounted range presented by MIDEA.
The series uses R-454B refrigerant, belongs to the Cold Climate V6.1 category indicated by the manufacturer, and can operate in heating mode down to -30 °C. Depending on the selected capacity, it reaches up to 33.3 SEER2 in cooling and up to 22.0 HSPF2.
For a home in Saint-Patrice-de-Sherrington, this low-temperature heating capacity is an important consideration.
We do not choose a heat pump only for the hot days of July. In our climate, the unit will also be called upon during a significant part of the heating season.
Its winter performance, actual capacity, and behavior as the outdoor temperature drops must therefore be examined.
Three capacities available in the MIDEA35 series
MIDEA documentation presents three main combinations in this series:
| Combination | Rated cooling | Rated heating | SEER2 | HSPF2 IV | AHRI |
|---|---|---|---|---|---|
| MSESU-H09B-2A / MO1SS-H09B-2A | 9 000 BTU/h | 12 000 BTU/h | 33,3 | 22,0 | 215471386 |
| MSESU-H12B-2A / MO1SS-H12B-2A | 12 000 BTU/h | 12 000 BTU/h | 29,4 | 14,5 | 215471387 |
| MSESU-H18B-2A / MO1SS-H18B-2A | 18,000 BTU/h | 20 000 BTU/h | 25,6 | 16,2 | 215471388 |
The modulated capacities are also different. For example, the 9,000 and 12,000 BTU models can drop to approximately 3,100 BTU/h in cooling mode, while the 18,000 BTU version has a different range.
However, the photo of our Saint-Patrice-de-Sherrington project does not allow us to reliably read the full number on the rating plate. We therefore do not arbitrarily assign it a specific capacity.
At AirGreen, we prefer to confirm the actual BTUs based on the indoor and outdoor model numbers rather than simply guessing the capacity by looking at the head dimensions.
Proper sizing remains more important than choosing the largest unit
A common mistake when choosing a heat pump is to think that a larger unit will necessarily be better.
This is not how we size an HVAC installation.
Floor area is important, but it is not enough. We must also consider:
- insulation;
- the number and size of windows;
- sun exposure;
- room layout;
- floors;
- heat loss;
- air circulation;
- the actual use of the space.
A properly selected heat pump should be able to meet the building's load while taking advantage of its modulation capacity.
Variable-speed technology completely changes how the system operates
MIDEA indicates that its variable-speed technology allows the compressor to continuously adjust its capacity to the temperature requirements rather than using only full on-and-off cycles.
According to the manufacturer, this notably helps reduce temperature variations in the room and achieve more stable operation.
This feature matters as much for comfort as it does for energy consumption.
When the requested temperature is nearly reached, the system can reduce its operation rather than stop completely and restart shortly afterward.
In a room where the unit is relatively close to the occupants, as this compact installation in Saint-Patrice-de-Sherrington may suggest, this modulation also improves the quality of the perceived comfort.
A sound level suited to residential spaces
The noise produced by an indoor heat pump deserves serious consideration, especially when it is located in a bedroom, office, or small living space.
For the MIDEA35 series, the documentation indicates indoor sound levels as low as 19 dB(A) for the 9,000 and 12,000 BTU/h versions, and up to 16 dB(A) for the 18,000 BTU/h version at its quietest setting.
These values correspond to specific operating conditions and obviously do not mean that the unit will operate constantly at this level.
When a room needs to be heated quickly in very cold weather or cooled after a significant buildup of heat, the airflow increases.
The advantage is most apparent once the temperature has stabilized, when the heat pump can operate more gently.
Behind the wall-mounted unit: the technical details that determine installation quality
The photograph essentially shows the indoor unit. Yet much of the work that determines system reliability is behind it.
Copper diameter varies according to MIDEA35 capacity
The refrigerant line selection must exactly match the installed combination.
For the MIDEA35 models 9,000 and 12,000 BTU/h, the documentation specifies liquid/gas lines of 1/4 in. and 3/8 in..
The 18,000 BTU/h uses instead 3/8 in. and 5/8 in..
This difference becomes particularly important when an existing heat pump is replaced.
Simply seeing two copper pipes in a wall is not enough to conclude that they are compatible with the new unit.
We check their diameter, condition, routing, and length before deciding whether they can be kept.
Maximum line lengths also differ
The 9,000 and 12,000 BTU/h MIDEA35 models allow a specified maximum line length of 82 ft, with a maximum height difference of 49.2 ft.
The 18,000 BTU/h version allows up to 164 ft, with a maximum height difference of 82 ft.
These data illustrate why two MIDEA35 installations can have completely different configurations, even when they use a very similar wall-mounted indoor unit.
R-454B and A2L technology
The MIDEA35 series uses R-454B, an A2L refrigerant. MIDEA documentation also mentions a leak detection sensor associated with this technology.
For the owner, this does not complicate everyday use of the heat pump.
For our technicians, however, the refrigerant used is essential information to confirm before installation and any future service.
Service equipment and procedures must match the unit’s technology.
Electrical requirements vary by BTU capacity
The electrical installation must also match the exact model.
For the MIDEA35:
- the 9,000 and 12,000 BTU/h configurations have a minimum ampacity of 16 A with a maximum protection of 20 A;
- the 18,000 BTU/h configuration has a minimum ampacity of 24.9 A and a maximum protection of 25 A;
- the specified power supply is 208/230 V, single-phase, 60 Hz.
This is another reason why the exact model number must always be known before determining the required electrical circuit.
The comfort features that the owner will actually use
Technical performance is important, but a heat pump is above all an appliance used every day.
The MIDEA35 range notably offers:
- the ECO mode;
- Turbo mode;
- night mode;
- the timer;
- the function Follow Me;
- automatic cleaning;
- silent mode;
- 8°C heating;
- horizontal and vertical swing;
- fan speed adjustment;
- humidity control;
- different energy-saving modes.
The Follow Me function is particularly useful when the wall-mounted unit is installed very high.
The temperature sensor built into the remote control can be used as a reference for room temperature, helping the system account for conditions where the occupants actually are rather than only near the unit.
A unit installed high up must remain accessible for maintenance
In the photograph from Saint-Patrice-de-Sherrington, the unit is very close to the ceiling.
For us, this means thinking during installation about what will happen in one year, three years, or five years.
The filters will need to be cleaned. The coil may eventually require a thorough cleaning. The blower wheel must also remain accessible.
MIDEA specifically indicates that the blower wheel in the MIDEA35, 28, and 25 series can be removed to facilitate thorough cleaning of the inside of the unit.
This feature is useful only if the installation leaves enough room to carry out the work.
That is why we incorporate future maintenance needsheat pump maintenance starting with the choice of location.
The mistakes we avoid when installing a compact wall-mounted unit
A situation like this highlights several common mistakes:
- place the unit too close to the ceiling without considering air intake;
- install the indoor unit in a corner without checking the required clearances;
- fail to plan for future panel access;
- choose the BTU rating based solely on floor area;
- reuse old refrigerant lines without checking their diameter;
- create an insufficiently sloped drain path;
- overlook the airflow direction;
- use electrical protection based on an estimate rather than the nameplate;
- forget to ensure easy access for cleaning;
- choose a heat pump solely for its cooling capacity without examining its heating performance.
These decisions may seem secondary during the purchase, but they become very important after several seasons of use.
What about financial assistance?
Homeowners shopping for a wall-mounted heat pump in Saint-Patrice-de-Sherrington naturally want to know whether the equipment may be eligible for financial assistance.
The MIDEA brochure identifies the different MIDEA35 combinations with their references AHRI, their capacities, and their cold-climate classification.
However, the brochure provided does not give the amount of a government grant or a program such as LogisVert for this specific installation.
We therefore cannot honestly determine financial assistance based solely on this photo.
For every project, it is necessary to verify the exact combination of indoor and outdoor units, the AHRI number, the relevant capacity, and the program criteria applicable on the actual installation date.
This method avoids quoting the homeowner an amount that would not correspond to their system.
A warranty that forms part of the system’s overall value
MIDEA’s Quebec documentation indicates a 12-year limited warranty on the compressor, 12 years on parts, and 10 years on labor, according to the terms applicable to the product and warranty.
The warranty should always be considered alongside performance, technical specifications, and installation quality.
A heat pump may have excellent specifications on paper, but its long-term reliability also depends on the quality of the vacuuming, connections, drainage, electrical supply, and maintenance.
A discreet installation that meets a very real constraint
This Saint-Patrice-de-Sherrington is not interesting because the heat pump draws attention.
It is interesting precisely because, once completed, the installation looks natural.
The MIDEA35 occupies the upper part of the wall without taking over the space. Its color blends into the decor, the louver remains free to operate, and the technical components are visually minimized.
In a small space, every centimeter counts. The position of a wall-mounted unit can determine the space left for a piece of furniture, a door, a decoration, or simply movement through the room.
We therefore always seek to reconcile HVAC performance, accessibility, and visual integration.
Our AirGreen approach in Saint-Patrice-de-Sherrington and Greater Montreal
At AirGreen, we apply this same attention to detail to our wall-mounted heat pumps in Saint-Patrice-de-Sherrington, but also in Montreal, Laval, Longueuil, on the South Shore and the North Shore.
The heat pump model is only one part of the project.
A successful installation also requires carefully choosing:
- capacity;
- the indoor unit’s position;
- the outdoor unit’s location;
- the copper line route;
- drainage;
- electrical connections;
- settings;
- airflow direction;
- access for maintenance.
In this project, the MIDEA35 found its place in a limited wall area where an approximate installation would quickly have resulted in a cluttered or difficult-to-maintain setup.
Our job was precisely to turn this constraint into a clean, functional installation suited to daily use throughout all four seasons.
For homeowners in Saint-Patrice-de-Sherrington who are currently comparing different heating and cooling solutions, this installation brings an important principle to mind: efficiency ratings matter, but the quality of the sizing and installation determines how these performance levels will actually be experienced in the home.