Installation of a MIDEA MIDEA35 wall-mounted heat pump in Notre-Dame-de-l’Île-Perrot, Vaudreuil-Soulanges
In Notre-Dame-de-l’Île-Perrot, AirGreen installs a MIDEA35 wall-mounted heat pump with discreet indoor integration, high efficiency, and a design intended for heating down to -30 °C.
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 where the indoor unit’s positioning makes all the difference
In an installation of a wall-mounted heat pump, the choice of equipment matters greatly, but its location in the room can be just as decisive. At Notre-Dame-de-l’Île-Perrot, we installed this MIDEA MIDEA35 wall-mounted heat pump, a series designed to offer particularly strong performance in Quebec’s climate. Midea documentation specifically classifies the MIDEA35 among its ductless wall-mounted systems.
The photo of this installation illustrates a detail we regularly encounter at AirGreen: the available space for installing an indoor unit is not always a completely unobstructed large wall. Here, the wall-mounted head unit was positioned high up, immediately beside a doorway and beneath ceiling trim. This type of location requires careful preparation to preserve airflow, access for maintenance, and the room’s appearance.
In the visible portion of the installation, no exposed refrigerant line cover runs across the wall around the indoor unit. The result remains very discreet in an entirely white décor, where a poorly positioned line set cover or an appliance installed too low would quickly have attracted attention.
A wall-mounted heat pump installed in a constrained architectural space
The ceiling trim and door frame naturally limited the positioning options. A unit installed too close to the ceiling can hinder return-air circulation and make filter cleaning more difficult. If installed too close to the opening, it can also direct a significant portion of its airflow straight toward a passageway rather than toward the room being cooled or heated.
We therefore need to consider several factors before drilling into the wall:
- the clearance required above and around the unit;
- access to the front panel and filters;
- the airflow path;
- the presence of trim, doors, and other architectural elements;
- the ability to drain condensate properly;
- the routing of the refrigerant lines and wiring;
- the outdoor unit’s location;
- easy access for future HVAC maintenance.
In this installation, Notre-Dame-de-l’Île-PerrotThe wall-mounted head unit fits above the passageway without visually encroaching on the main wall. The lower louver visible in the photo is directed toward the living area, allowing the treated air to be distributed into the room rather than remaining concentrated against the ceiling.
Why the path of the lines matters just as much as the heat pump’s position
A ductless wall-mounted heat pump connects the indoor unit to the outdoor unit through refrigerant lines, wiring, and condensate drainage. Midea indicates that this type of system allows installation with a relatively small wall opening and offers considerable flexibility in unit placement.
For a homeowner, the final result often appears simple: a white indoor unit installed on the wall. For our technicians, several checks are involved behind this apparent simplicity.
We pay particular attention to:
Condensate drain slope
In cooling and dehumidification mode, the indoor unit produces water. An improperly sloped drain can cause backflow, drainage noises, or eventually a water leak indoors.
Refrigerant connections
Each connection must be properly prepared and tightened in accordance with the technical requirements. An improper connection can cause a gradual refrigerant leak and significantly reduce the unit’s performance.
Evacuating the system
Before commissioning, moisture and air must be removed from the refrigerant lines. This step helps protect the compressor and ensure the system operates as intended.
Wiring placement
Communication between the indoor and outdoor units must comply with the manufacturer’s electrical requirements. The MIDEA35 notably uses connection wiring 14-4 AWG in the configurations indicated by Midea.
Why the MIDEA35 is particularly well suited to heating and cooling needs in Quebec
The MIDEA35 belongs to the manufacturer’s premium wall-mounted lineup. Midea presents it as an extreme-climate heat pump capable of heating down to -30°C, using the refrigerant R-454B, with efficiencies reaching 33.3 SEER2 and 22.0 HSPF2, depending on the capacity and equipment combination selected.
These features are particularly relevant to Notre-Dame-de-l’Île-Perrot, where a heat pump must do more than cool efficiently in July. It must also be able to provide heating during a significant part of the Quebec winter.
Three different capacities in the MIDEA35 series
The exact capacity of the installed unit is not legible in the provided photo; we therefore prefer not to arbitrarily assign a BTU rating to this installation.
Midea’s technical documentation presents three configurations in the MIDEA35 series:
- 9,000 BTU/h in cooling, AHRI reference 215471386;
- 12,000 BTU/h in cooling, AHRI reference 215471387;
- 18,000 BTU/h in cooling, AHRI reference 215471388.
The listed nominal heating capacities are respectively 12,000, 12,000, and 20,000 BTU/h.
This distinction is important. We avoid choosing a heat pump solely according to the approximate floor area of a home. Two rooms of similar size can have very different heating and cooling loads depending on insulation, sun exposure, the number of windows, the floor, the interior layout, and the amount of air flowing toward neighboring rooms.
Up to 33.3 SEER2: understanding efficiency instead of looking only at BTUs
In the MIDEA35 range, the 9,000 BTU model reaches SEER2 of 33.3, while the 12,000 BTU model reaches 29.4 SEER2 and the 18,000 BTU model 25.6 SEER2.
A high SEER2 rating means that a system can provide substantial cooling relative to the electricity it consumes under the standardized conditions used for certification.
However, it should not be concluded that a smaller unit is automatically preferable because its SEER2 rating is higher. Properly sizing a heat pump remains essential.
An undersized unit may run constantly without managing to maintain the desired temperature during the most demanding periods. Conversely, a unit that is too large for the area may result in cycling that is less favorable for comfort and humidity control.
At AirGreen, the sizing of a wall-mounted heat pump is therefore an integral part of installation quality.
Heating down to -30°C
The three MIDEA35 configurations listed in the documentation have a heating operating range extending down to -30°C. The published heating range is from -30°C to 24°C.
This value does not mean that the capacity is identical at all temperatures. As with virtually all heat pumps, capacity and efficiency change as the outdoor temperature drops.
That is why we also look at cold-weather performance data when recommending a unit for Montreal, Laval, Longueuil, the North Shore, the South Shore, or Vaudreuil-Soulanges.
R-454B refrigerant and the specific features of a modern installation
The MIDEA35 operates with R-454B, an A2L-category refrigerant. Midea documentation specifically mentions an A2L refrigerant leak detection sensor and a corresponding dispersion system on the applicable series.
For us, this reinforces the importance of an installation carried out using the methods, tools, and procedures suited to next-generation systems.
Replacing an old heat pump is therefore not simply a matter of reconnecting two new units to existing piping. The pipe diameter, condition, length, wiring, and installation compliance must all be checked.
Different pipe dimensions depending on capacity
This series is a good example of the importance of checking the exact specifications before installation.
The 9,000 and 12,000 BTU MIDEA35 models use piping of 1/4 in for the liquid line and 3/8 in for the gas line, with a published maximum length of 82 ft.
The 18,000 BTU version instead uses 3/8 in and 5/8 in, with a published maximum length of 164 ft.
Automatically reusing old piping without validating these dimensions is precisely the mistake we seek to avoid during an HVAC installation.
A particularly quiet indoor unit
In a bedroom, living room, or workspace, the noise from the indoor unit can be just as important as its performance.
Depending on capacity, Midea indicates indoor sound levels that can drop to approximately 19 dB(A) for the 9,000 and 12,000 BTU models and up to 16 dB(A) for the 18,000 BTU model under certain operating conditions.
The range also offers precise airflow control. The brochure mentions 100 air volume adjustment levels, as well as remote control through the SmartHome app and Wi-Fi when available.
Useful everyday features, not just specifications on a technical sheet
The MIDEA35 includes several features that can genuinely improve daily use:
- ECO mode;
- Turbo mode;
- sleep mode;
- timer;
- child lock;
- function Follow Me;
- automatic cleaning;
- silent mode;
- 8°C heating;
- horizontal and vertical swing;
- Wi-Fi control;
- smart sensor;
- humidity control;
- option of wired control on compatible configurations.
The Follow Me, for example, uses the temperature sensor integrated into the remote control to adjust operation according to the temperature measured near the user rather than only near the wall-mounted unit.
In an installation like the one photographed in Notre-Dame-de-l’Île-Perrot, where the unit is installed quite high on the wall, this option can be particularly practical for better representing the temperature actually felt in the occupied zone.
A discreet installation must also remain accessible for maintenance
Installing a wall-mounted unit neatly near the ceiling should never prevent its maintenance.
The filters must be removable, and the front panel must remain accessible. Over time, dust and particles can accumulate on the filters, the coil, and the blower wheel.
Midea also designed the MIDEA35, MIDEA28, and MIDEA25 series with a removable blower wheel, designed to facilitate deep cleaning and access to the inside of the unit.
For AirGreen, this aspect is directly part of our thinking when choosing the location: an installation should not only look good on the day we leave the job site. It must remain practical several years later when a technician comes to perform a wall-mounted heat pump cleaning or a service call.
Midea residential warranty
The Midea brochure indicates a residential a 12-year limited warranty on the compressor, 12 years on parts, and 10 years on labor, subject to the terms and conditions applicable to the warranty program.
As always, we recommend keeping the information related to the model, serial number, invoice, and equipment registration.
What about rebates for a MIDEA35?
Eligibility for financial assistance should never be determined solely from the commercial name “MIDEA35.”
It depends in particular on:
- the exact indoor model;
- the exact outdoor model;
- the reference number AHRI;
- the type of building;
- the program in effect at the time of application;
- the other applicable technical and administrative criteria.
That is why we always verify the complete equipment combination when a homeowner wishes to take advantage of a financial assistance program such as those associated with cold-climate heat pumps.
What this Notre-Dame-de-l’Île-Perrot installation illustrates particularly well
This photo might appear to show simply another white heat pump installed on a white wall. To us, it instead highlights several important decisions made during a professional installation.
The unit had to fit between an opening and a ceiling molding. A visually cluttered result had to be avoided. The unit needed to remain accessible. The airflow had to be able to spread toward the area being treated. Finally, all the hidden components—drainage, refrigerant lines, power, and electrical communication—had to work together properly.
It is precisely in these kinds of details that the difference lies between installing a machine and completing a genuine wall-mounted heat pump installation.
In Notre-Dame-de-l’Île-Perrot, as in our projects in Montreal, Laval, Longueuil, on the North Shore and the South Shore, we adapt the installation to the property's actual configuration rather than choosing a location simply because it is quicker to reach.
With a MIDEA MIDEA35, this approach makes it possible to fully benefit from a heat pump designed for extreme-cold heating, variable-speed operation, precise airflow control, and very high-efficiency cooling.
For a homeowner currently comparing different ductless heating and cooling, performance figures are important. But a high-performing system reaches its full potential only when it is properly sized, correctly installed, and intelligently positioned within the space.
It is this combination of equipment selection, HVAC expertise, and installation quality that we seek to replicate on every AirGreen job.
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.
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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).