Installation of a MIDEA MIDEA35 wall-mounted heat pump in Saint-Jean-Baptiste: outdoor unit on wall brackets and a discreet conduit on a brick façade
AirGreen installation of a MIDEA35 wall-mounted heat pump in Saint-Jean-Baptiste: unit on wall brackets, discreet outdoor conduit, heating down to -30 °C, and design adapted to Quebec’s climate.
Take a tour of the installation
Each number is a point we check on site. Switch between summer and winter to watch air and heat move.
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.
A MIDEA35 installation designed around the façade, Quebec’s climate, and finish quality
For this installation carried out in Saint-Jean-Baptiste, we faced a very practical constraint: integrating a MIDEA MIDEA35 wall-mounted heat pump on a brick façade with several windows, while maintaining a clean, accessible, and functional installation.
The job-site photograph immediately highlights several important choices. The outdoor unit MIDEA is mounted on the wall using two metal brackets rather than being placed directly at ground level. The line connecting the equipment is grouped inside a brown vertical cover installed between the windows. The entire assembly follows an architectural line already present on the façade instead of leaving the refrigerant pipes and wiring exposed.
These are precisely the details that distinguish a simple equipment installation from a HVAC installation carefully considered.
The MIDEA35 belongs to Midea’s high-end wall-mounted series. According to the manufacturer’s documentation, this range uses the refrigerant R-454B, is identified Cold Climate V6.1, operates in heating mode down to -30 °C and can reach up to 33.3 SEER2 and 22.0 HSPF2, depending on the selected capacity.
Why the outdoor layout matters as much as the heat pump itself
A wall-mounted heat pump must be chosen for its performance, but it must also be installed in an environment that allows it to operate properly.
On this façade Saint-Jean-Baptiste, we had a relatively narrow area between different openings. We therefore had to consider several elements simultaneously:
- the position of the windows;
- the refrigerant line routing;
- access to the unit for future maintenance;
- the clearance in front of the outdoor fan;
- the presence of the foundation;
- the visual finish against the brick;
- the unit’s exposure to winter conditions.
We installed the outdoor unit on metal wall brackets, which keeps the unit off the ground and maintains open space beneath it. In a Quebec environment where snow, ice, and meltwater are part of the realities of an outdoor installation, the unit’s positioning deserves particular attention.
The Midea brochure also confirms that the side-discharge outdoor units in this family were designed in a compact format and can be installed on a base or on a support.
In the photo, the front of the unit remains completely unobstructed. This is not merely an aesthetic detail: the heat exchanger and fan must be able to move outdoor air properly so that the heat pump is operating under good conditions.
A vertical conduit integrated between the windows
One of the most visible elements of this installation is the brown line-set cover running vertically down the brick façade.
Rather than leaving the refrigerant tubing, wiring and other connection components visible, we grouped them inside an outdoor conduit that follows a straight route between the windows.
This method allows us to:
- to achieve a much cleaner finish;
- to protect the lines from impacts and the elements;
- to make it easier to organize the route between the indoor and outdoor units;
- to reduce the visual impact of thewall-mounted heat pump installation on the façade.
Midea wall-mounted systems are specifically designed to connect the indoor unit to the outdoor unit with relatively compact refrigerant lines, without requiring the modifications associated with a central ducted system.
On a brick property like this one, the route chosen even before drilling begins can have a major impact on the final result. We always seek a compromise between the optimal technical route and a finish that respects the building's appearance.
MIDEA35: three available capacities, with different features
The exact capacity of the installed unit cannot be read from the photograph provided. We therefore do not make it up. The series MIDEA35 presented by Midea nevertheless includes three main configurations: 9,000, 12,000 and 18,000 BTU/h in cooling mode.
Here is the published technical data for this range:
| Rated cooling capacity | 9,000 BTU/h | 12,000 BTU/h | 18,000 BTU/h |
|---|---|---|---|
| Indoor model | MSESU-H09B-2A | MSESU-H12B-2A | MSESU-H18B-2A |
| Outdoor model | MO1SS-H09B-2A | MO1SS-H12B-2A | MO1SS-H18B-2A |
| AHRI reference | 215471386 | 215471387 | 215471388 |
| SEER2 | 33,3 | 29,4 | 25,6 |
| HSPF2 IV | 22,0 | 14,5 | 16,2 |
| Rated heating | 12,000 BTU/h | 12,000 BTU/h | 20,000 BTU/h |
| Published heating temperature | down to -30 °C | down to -30 °C | down to -30 °C |
| Power supply | 208/230 V | 208/230 V | 208/230 V |
These values come from the manufacturer's MIDEA35 technical data sheet.
This distinction between capacities is essential. You should not automatically select a larger heat pump assuming it will necessarily provide better comfort.
Proper sizing takes into account, among other factors:
- the volume and layout of the rooms;
- the level of insulation;
- the amount and arrangement of windows;
- solar exposure;
- the floor where the indoor unit is located;
- heat loss;
- air circulation between spaces.
At AirGreen, choosing a wall-mounted heat pump therefore does not simply involve reading a property's square footage and choosing a number of BTUs from a general table.
Performance suited to Quebec winters
One of the main advantages of the MIDEA35 is its heating operating range.
Midea indicates heating operation from -30°C to 24°C for all three capacities in the series. The published cooling operating range also extends from -30°C to 50°C.
This feature is particularly relevant for homeowners looking for a low-temperature heat pump in Quebec.
However, two concepts that are often confused must be distinguished: the minimum temperature at which a heat pump can continue operating and the exact amount of heat it can provide when the outdoor temperature drops significantly.
Midea’s documentation provides data at -15°C. The nominal heating capacities indicated at this temperature are 13,500 BTU/h for the 9,000 and 12,000 BTU models, and 22,600 BTU/h for the 18,000 BTU model.
For us, this type of data is much more useful when analyzing a project than simply stating “operates down to -30°C.”
Energy efficiency: up to 33.3 SEER2
The 9,000 BTU version of the MIDEA35 achieves a published efficiency rating of 33.3 SEER2, while the 12,000 and 18,000 BTU versions are respectively rated at 29.4 and 25.6 SEER2.
Midea uses variable-speed technology that allows the compressor to continuously adapt its operation to the needs of the room rather than operating solely according to a traditional on-off cycle. The brochure associates this principle with reduced temperature variations and more stable operation.
In everyday use, this modulation is important.
When a room approaches its setpoint temperature, a variable-speed heat pump can gradually reduce its capacity instead of stopping abruptly and restarting a few minutes later. This helps maintain a more uniform temperature while limiting repetitive cycles.
A heat pump that goes beyond heating and cooling
The MIDEA35 series offers several functions that genuinely influence the day-to-day use of the unit.
Those presented by Midea include, among others:
- the ECO mode;
- Turbo mode;
- gradual fan speed adjustment;
- night mode;
- the timer;
- the function Follow Me;
- automatic cleaning;
- silent mode;
- 8°C heating;
- horizontal and vertical oscillation;
- the Wi-Fi interface;
- the intelligent sensor;
- humidity control;
- the optional wired controller;
- different airflow management functions.
The function Follow MeFor example, it uses the remote control’s temperature sensor to adjust operation according to the temperature measured near the occupant rather than exclusively near the wall-mounted unit.
In a bedroom, living room, or office where the unit is installed relatively high on the wall, this possibility may be useful because the temperature measured near the ceiling is not always the same as that felt in the occupied area.
This Saint-Jean-Baptiste project shows why installation details are just as important as the technical specifications
Refrigerant lines must exactly match the installed capacity
A technical detail deserves particular attention on the MIDEA35 series: the line diameters are not identical for all capacities.
For the models 9,000 and 12,000 BTU, Midea specifies lines measuring 1/4 in. liquid and 3/8 in. gas.
For the model 18,000 BTU, the dimensions increase to 3/8 in. liquid and 5/8 in. gas.
This is exactly the kind of detail we check before an installation or when replacing an old heat pump.
Automatically reusing existing lines without confirming their diameter, condition, and compatibility with the new unit can create problems. A professional installation must be designed around the specific requirements of the installed indoor-outdoor combination.
The same applies to the electrical system
Electrical requirements also vary according to capacity.
The MIDEA35 specification sheet indicates a minimum allowable amperage of 16 A for the 9,000 and 12,000 BTU versions and 24.9 A for the 18,000 BTU version. The maximum protections indicated are respectively 20 A, 20 A, and 25 A.
This means that inspecting the electrical panel and the circuit intended for the heat pump is an important part of the checks before confirming an installation.
Replacing only the outdoor unit without verifying the available electrical supply is not a method we recommend.
The sound level also deserves consideration
Positioning a heat pump near windows requires particular consideration of noise.
For MIDEA35 outdoor units, Midea indicates a published maximum outdoor sound level of 57 dB(A) for the 9,000 and 12,000 BTU versions and 61.5 dB(A) for the 18,000 BTU version.
Indoors, certain configurations can operate at very low levels. The documentation specifically indicates values that can drop as low as 19 dB(A) for the 9,000 and 12,000 BTU wall-mounted units and up to 16 dB(A) for the 18,000 BTU unit under certain ventilation conditions.
However, the actual perceived sound level depends on many factors: fan speed, requested load, location, reverberation, mounting, and the environment around the unit.
What the photograph reveals about the quality of the finish
The final result of this installation at Saint-Jean-Baptiste allows us to observe several elements that we consider important at AirGreen.
The outdoor unit is positioned in an orderly manner on its supports. The brown conduit rises vertically instead of crossing the façade with several unnecessary changes of direction. The pipes do not hang loosely. The façade remains clean and orderly.
The logo AirGreen affixed to the unit also clearly indicates who carried out the installation, which is particularly useful when a homeowner must contact their contractor several years later for maintenance or a service request.
This type of finish is relevant for a home as well as for a Saint-Jean-Baptiste as for an installation of wall-mounted heat pump in Montreal, Laval, Longueuil, on the North Shore, or on the South Shore.
The mistakes we seek to avoid on a wall-mounted installation
A good installation does not depend solely on the brand selected. Several mistakes can reduce the quality of a project equipped with an excellent machine.
We pay particular attention to the following situations:
- Choosing too many BTUs without conducting an adequate analysis. An oversized machine is not automatically more comfortable.
- Reusing incompatible refrigerant lines. The required diameter varies by model.
- Positioning the outdoor unit without considering snow and service access.
- Creating an unnecessarily complex piping route. A route planned before installation generally produces a much cleaner result.
- Neglecting the electrical inspection. The circuit and protection requirements must match the exact model.
- Choosing the indoor unit's location based solely on aesthetics. Air distribution throughout the room must remain a priority.
- Forgetting about future maintenance. A unit must remain accessible for cleaning, inspections, and any necessary repairs.
Maintenance: an interesting aspect of the MIDEA35 design
Midea also emphasizes ease of access for cleaning. For the MIDEA35, 28, and 25 series, the brochure states that the indoor fan wheel can be removed to allow more thorough cleaning of the unit.
This feature is relevant because a wall-mounted heat pump continuously circulates the room air through its filter, heat exchanger, and fan wheel.
Regular maintenance helps preserve:
- airflow quality;
- heat-transfer efficiency;
- the cleanliness of the unit;
- drainage operation;
- sound comfort.
Even a highly efficient system can lose some of its benefits when the filters, heat exchanger, or fan wheel accumulate a significant amount of dust.
What about rebates?
Midea documentation identifies the MIDEA35 models as Cold Climate V6.1 and provides their respective AHRI references.
This information is particularly important when a financial assistance program requires a certified equipment combination.
However, a certification indicated in a brochure should not automatically be interpreted as confirmation of a specific subsidy amount. Eligibility must always be verified based on the exact AHRI number of the installed unit, the current program, and the conditions applicable to the building at the time of the application.
At AirGreen, we prefer to verify the exact model rather than promise financial assistance based solely on the heat pump’s commercial name.
The Midea warranty presented for the residential sector
The brochure provided presents, for the residential sector, a 12-year limited warranty on the compressor, 12 years on parts, and 10 years on labor, subject to the terms of the applicable warranty program.
As with any HVAC warranty, it remains important to verify the registration conditions, exclusions, residential or commercial use, and maintenance requirements.
An installation that demonstrates what we look for at AirGreen
This installation of a MIDEA35 wall-mounted MIDEA heat pump in Saint-Jean-Baptiste summarizes our approach well: selecting suitable equipment, carefully planning the piping route, considering the façade, and installing the outdoor unit in a logical position for its operation and maintenance.
The unit naturally attracts attention, but much of the important work lies in what surrounds it: supports, connections, electrical work, drainage, copper routing, exterior finishing, indoor unit placement, and commissioning.
For a homeowner comparing a Midea heat pump, an HVAC installation or multiple contractors to Montreal, Laval, Longueuil, on the North Shore or the South Shore, we therefore recommend examining both the proposed installation method and the model listed on the quote.
A MIDEA35 A properly sized and installed unit offers particularly attractive features for Quebec’s climate: heating operation down to -30 °C, variable-speed technology, efficiency of up to 33.3 SEER2, refrigerant R-454B, certification Cold Climate V6.1 and several comfort-control options.
On this project in Saint-Jean-Baptiste, our goal was to ensure that these technical specifications were accompanied by a clean exterior installation consistent with the building. The final photo shows the result: a securely positioned Midea unit, an organized piping route, and a façade that maintains a neat appearance.
The unit on this job, in figures
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 35 9 000 | 11,000 | 13,500 | −30 °C: 7,500 | 2.0 | 33.3 | 14.6 | – |
| Midea Série 35 12 000 | 11,000 | 13,500 | −30 °C: 7,500 | 2.0 | 29.4 | 12.7 | $1,320 |
| Midea Série 35 18 000 | 19,300 | 22,600 | −30 °C: 11,900 | 2.34 | 25.6 | 16.2 | $2,316 |
According to NEEP, its certified maximum capacity at −30 °C (−22 °F) is 7,500 BTU/h, 83% of its nominal 9,000 BTU size.
At 8 °C, its certified maximum capacity reaches 17,200 BTU/h, 91% more than its nominal 9,000 BTU size.
According to NEEP, its certified heating capacity at −15 °C (5 °F) is 13,500 BTU/h, 150% of its nominal 9,000 BTU size. Its COP there is 2.00.
According to NEEP, its certified maximum capacity at −30 °C (−22 °F) is 7,500 BTU/h, 62% of its nominal 12,000 BTU size.
At 8 °C, its certified maximum capacity reaches 17,200 BTU/h, 43% more than its nominal 12,000 BTU size.
According to NEEP, its certified heating capacity at −15 °C (5 °F) is 13,500 BTU/h, 112% of its nominal 12,000 BTU size. Its COP there is 2.00.
According to NEEP, its COP at −15 °C is 2.34: the highest of the Série 35 line, which ranges from 2.00 to 2.00 at that temperature.
According to NEEP, its certified maximum capacity at −30 °C (−22 °F) is 11,900 BTU/h, 66% of its nominal 18,000 BTU size.
At 8 °C, its certified maximum capacity reaches 29,700 BTU/h, 65% more than its nominal 18,000 BTU size.
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.
The big day, step by step
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 would it look like 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.
Four mistakes we do not make
Flip each card to see what we do instead.
Your own project, step by step
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.
Is your home ready?
Check what applies at your place. A "no" is not a refusal: it is what we sort out during the estimate.
Four statements: true or false?
It all comes down to details you have just seen.
1. In heating mode, the outdoor unit can produce water.
During defrost cycles. That water must drain away without forming ice.
2. You pick the capacity with a simple square-footage rule.
Windows, insulation, orientation and how the room is used all count. Capacity is chosen on site.
3. A multi-zone connects several indoor heads to a single condenser.
One head per room, all on the same condenser. Each room keeps its own temperature.
4. The disconnect can sit behind the patio furniture.
It must stay accessible: it is what shuts the unit off for service.
0 / 4 right answers
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.
More jobs to see, near you
By town, by equipment or by region: browse more than 4,700 published projects.
Each dot: a town where AirGreen has published projects. The glowing dot: this job.
Every house has its constraints. We see them before we install.
The on-site estimate is free and the quote follows within 24 hours.
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).