Installation of a MIDEA35 12,000 BTU Wall-Mounted Heat Pump in Deux-Montagnes: a Compact, Efficient Solution Perfectly Suited for an Urban Balcony
AirGreen installs a MIDEA35 12,000 BTU wall-mounted heat pump in Deux-Montagnes: optimized balcony, clean conduits, efficient comfort, and HVAC expertise on the North Shore.
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.
An HVAC Installation Designed for Comfort, Available Space, and the Reality of Homes in Deux-Montagnes
In Deux-Montagnes, many residences combine the charm of established neighborhoods with very real technical constraints: narrow balconies, brick facades, close proximity to neighbors, limited access to exterior walls, condominium regulations, and the need to preserve building aesthetics. This installation of a MIDEA35 12,000 BTU wall-mounted heat pump perfectly illustrates the type of project where on-site expertise makes all the difference.
At AirGreen, we carried out this HVAC installation on a residential balcony, in an environment where every detail had to be precisely measured. The Midea outdoor unit was installed on a raised aluminum support, solidly anchored and perfectly positioned to respect airflow, mechanical stability, the necessary clearance for maintenance, and the available space on the balcony.
The project photo clearly highlights several important aspects: a neatly installed outdoor unit, protected piping, discreet routing of conduits along the brick wall, and sufficient frontal clearance to allow the fan to efficiently discharge air. In an area like Deux-Montagnes, where properties can vary between single-family homes, duplexes, triplexes, and apartment buildings, this type of adaptation is essential to ensure long-lasting performance.
This MIDEA35 12,000 BTU heat pump was chosen to meet a specific need: to provide stable cooling comfort in summer and efficient heating during cooler periods, while maintaining a compact footprint. For many homeowners on the North Shore, including Deux-Montagnes, Sainte-Marthe-sur-le-Lac, Saint-Eustache, Boisbriand, or Laval, this type of wall-mounted air conditioner with heat pump function represents a very relevant solution when indoor and outdoor space needs to be optimized.
Why a MIDEA35 12,000 BTU for this project in Deux-Montagnes?
The MIDEA35 12,000 BTU is a wall-mounted heat pump designed for residential spaces requiring a device that is discreet, efficient, and versatile. Its 12,000 BTU capacity is well suited to various configurations: open living room, main living area, condo, apartment, partial floor, or large room, depending on insulation, sun exposure, and interior layout.
In this specific case, the goal was to create a well-controlled comfort zone without resorting to a more complex central system. A Mini Split type wall system allows direct targeting of the occupied space, with more precise temperature management and generally more reasonable consumption than a portable air conditioning unit or an old window unit.
The advantages sought by the client were clear:
- obtain a wall-mounted air conditioner that is quieter and more aesthetically pleasing than a temporary solution;
- benefit from a heat pump capable of heating during intermediate seasons;
- reduce indoor clutter;
- preserve balcony usage as much as possible;
- ensure a clean, durable installation in accordance with industry best practices;
- limit vibrations and noise transmitted to the structure.
This last point is particularly important on a balcony. A poorly installed outdoor unit can generate vibrations, create an unpleasant resonance, or disturb occupants and neighbors. That's why our team favored an installation on a raised support, with a stable base and well-distributed support points.
Balcony Installation: Technical Challenges Never to Be Underestimated
Installing an outdoor unit on a balcony is never an improvised act. Unlike a ground-level installation, where one can sometimes work with more freedom, a balcony imposes several simultaneous constraints. One must consider the weight of the unit, the clearance in front of the fan, occupant circulation, drainage, access for future maintenance, safety, protection of conduits, and visual impact.
In this project in Deux-Montagnes, the Midea outdoor unit was placed in a way that does not unduly obstruct the balcony space. Its orientation allows for good air evacuation, an essential criterion for maintaining system efficiency. A common mistake is to install the unit too close to a wall, a railing, an awning, or an obstacle that blocks airflow. The result: the unit works harder, efficiency decreases, consumption increases, and the lifespan of the compressor can be affected.
Our team therefore paid particular attention to clearances. The front of the unit, where the fan is located, had to remain clear. The sides and back also had to allow for adequate ventilation. In the photo, you can see that the unit is installed near the brick wall, but with a positioning that maintains access to connections and conduit routing.
The Raised Support: Stability, Drainage, and Durability
The metal support installed under the unit plays an essential role. It's not just about "placing" the heat pump. An adequate base allows for:
- keeping the outdoor unit above the balcony surface;
- facilitating water flow;
- reducing the risk of snow or debris accumulation;
- improving access for HVAC maintenance;
- limiting prolonged contact with moisture;
- stabilizing the unit to reduce vibrations.
In Deux-Montagnes, as elsewhere on the North Shore, winter conditions require a robust installation. Even for a compact 12,000 BTU unit, it is necessary to anticipate snow, ice, wind, freeze-thaw cycles, and exposure to the elements. A well-chosen support extends the lifespan of the appliance and helps maintain stable performance throughout the seasons.
Conduit Routing: Clean, Discreet, and Protected
Another visible element of this installation is the routing of the conduits into the building. On a brick wall, care must be taken to create a clean, well-sealed, and durable passage. Drilling must be done at the correct angle, with particular attention to waterproofing. Poor wall penetration can lead to water infiltration, thermal loss, or aesthetic problems.
In this project, the refrigerant lines, communication cable, and condensate drain were neatly organized. Everything was protected to maintain a clean and professional finish. This is an aspect that many clients only notice after installation: two identical systems can offer very different results depending on the quality of the finishing work.
At AirGreen, we believe that the final appearance is an integral part of the quality of an HVAC installation. A wall-mounted heat pump must be efficient, but it must also blend into the building without giving the impression of an improvised addition.
The MIDEA35 12,000 BTU: A Smart Choice for North Shore Residences
The Midea brand is well-known in the field of wall-mounted systems, particularly for its compact, efficient, and residential-suited equipment. The MIDEA35 12,000 BTU model is aimed at homeowners looking for a reliable heating and air conditioning solution, without excessive capacity.
The 12,000 BTU capacity is often ideal when properly selected. A unit that is too small risks running constantly and struggling to reach the desired temperature. A unit that is too large can cool too quickly without dehumidifying properly, which reduces comfort. The correct capacity depends on several factors:
- area of the room or zone;
- ceiling height;
- insulation level;
- sun exposure;
- number of windows;
- air circulation between rooms;
- floor of the dwelling;
- presence of other heat sources;
- occupants' usage habits.
In this project, the choice of a 12,000 BTU wall-mounted system provided a balanced response to the client's needs. For many homes in Deux-Montagnes, this capacity represents an excellent compromise between performance, installation cost, discretion, and comfort.
Cooling Comfort in Summer
Summers in Deux-Montagnes can be humid, especially during prolonged heatwaves. A quality wall-mounted air conditioner does not just lower the temperature: it also helps control indoor humidity, which significantly improves the feeling of comfort. A space at 23 °C with well-controlled humidity is often much more pleasant than a colder but humid space.
The MIDEA35 allows for regular air diffusion, without the usual drawbacks of window units: high noise, loss of light, reduced security, air infiltration, and seasonal installation. Once installed, the wall-mounted heat pump remains in place all year round and is used as needed.
Efficient Heating in Mid-Season
A wall-mounted heat pump is also very useful in spring and autumn. In many residences, it helps reduce the use of main heating during cool days, especially in rooms occupied in the evening or early morning. For customers in Montreal, Laval, Longueuil, the North Shore, and the South Shore, this aspect is often a major argument: a single appliance can improve comfort for a large part of the year.
Of course, heating performance varies depending on the outdoor temperature, the exact model, the installation, and the building's needs. This is why a good initial assessment remains essential. At AirGreen, we don't just recommend a brand or capacity; we analyze the reality of the dwelling, technical constraints, and the client's objectives.
What this Deux-Montagnes installation reveals about a good HVAC approach
This installation demonstrates one simple thing: the quality of a wall-mounted heat pump project does not rely solely on the chosen appliance. It also depends on planning, positioning, conduit protection, noise management, compliance, and finishing.
Location Analysis Before Installation
Before installing the outdoor unit on the balcony, our team assessed the available space and the building's constraints. The balcony had to remain usable. The unit should not block the door, obstruct circulation, or hinder access to other elements of the facade. The railing and proximity to neighbors also had to be taken into account.
In dense residential areas, particularly in Montreal, Laval, Longueuil, and on the North Shore, this type of analysis prevents many problems. A poorly placed unit can become difficult to maintain, too visible, too noisy, or inefficient. A well-placed unit becomes almost natural in its environment.
Mechanical Installation and Connections
The installation of a wall-mounted heat pump involves several steps that must be carried out with precision:
- determining the indoor and outdoor location;
- drilling the wall with an appropriate slope;
- installing the outdoor support;
- positioning the outdoor unit;
- routing of refrigerant lines and wiring;
- connecting the indoor unit;
- leak testing;
- vacuuming the refrigerant circuit;
- electrical verification;
- startup, performance tests, and explanations to the client.
These steps should not be rushed. Vacuuming, for example, is a critical step that removes moisture and air from the refrigerant circuit. A poorly prepared system can lose performance or suffer premature wear. This is one of the reasons why we always emphasize the importance of hiring a specialized company and qualified technicians.
Common Mistakes to Avoid During Wall-Mounted Heat Pump Installation
Many problems we observe in the field come from installations done too quickly or without true technical analysis. Here are the most frequent mistakes:
- choosing a capacity solely based on price, without calculating actual needs;
- placing the outdoor unit in a poorly ventilated corner;
- installing the unit too close to a railing or wall;
- neglecting the slope of the condensate drain;
- leaving exposed conduits without adequate protection;
- ignoring vibrations on a balcony or light structure;
- drilling a brick wall without durable sealing;
- forgetting future access for HVAC maintenance;
- choosing an indoor location that creates an uncomfortable air current.
In the case of this MIDEA35 in Deux-Montagnes, these points were anticipated from the outset. The result is a clean, stable installation adapted to the client's actual environment.
A Discreet Installation Despite Limited Space
One of the most interesting aspects of this project is the integration of the unit on an urban balcony. The presence of a brick wall, a black railing, a patio door, and a nearby awning required careful execution. A misaligned installation would have been immediately visible and could have hindered the use of the balcony.
Our team therefore worked to create an installation that was both functional and visually orderly. The conduits are neatly grouped, the unit rests on an adapted structure, and the whole maintains a professional appearance. For a client, this difference is seen every day. For a technician, it also facilitates future interventions.
The Importance of Post-Installation Maintenance
A well-installed heat pump must also be properly maintained. To maintain good performance, we recommend regularly cleaning the indoor unit filters, keeping the outdoor unit clear, and scheduling periodic professional HVAC maintenance.
On a balcony, some elements require special attention:
- leaves or dust accumulating near the unit;
- snow or ice around the bracket;
- obstruction in front of the fan;
- unusual vibration;
- abnormal water flow;
- new noise at startup or during operation.
Regular maintenance helps maintain energy efficiency, reduce the risk of breakdowns, and extend the system's lifespan. For homeowners in Deux-Montagnes and the North Shore, this vigilance is particularly important due to temperature variations and winter conditions.
Subsidies and energy efficiency: a factor to check before purchase
Subsidy programs can represent a significant financial advantage when purchasing a wall-mounted heat pump. Eligibility generally depends on the exact model, its performance, its registration on recognized lists, and the rules in force at the time of installation. For this reason, it is essential to verify the information before confirming a project.
At AirGreen, we support our clients through this step by validating available data and clearly explaining the procedures. Whether in Montreal, Laval, Longueuil, on the North Shore or the South Shore, many owners want to understand not only the installation price, but also the real cost after subsidies, the possible savings, and the long-term value of the system.
The MIDEA35 12,000 BTU can be a very interesting option depending on the applicable criteria at the time of the project. The important thing is never to rely on general information without validating the specific model and program conditions.
Why entrust this type of project to AirGreen?
An installation like this seems simple when completed, but it requires a series of important technical decisions. The choice of support, the unit's position, pipe management, drilling, sealing, commissioning, and final verification directly influence customer comfort.
At AirGreen, we are accustomed to working in varied environments: condo balconies, Montreal alleys, brick facades, North Shore homes, Laval properties, Longueuil multi-unit buildings, South Shore residences, and installations requiring coordination with co-ownership syndicates. This experience allows us to adapt each project to the real context, rather than applying a single method to all situations.
Our approach is based on a few simple principles:
- recommend an adapted capacity;
- install cleanly and durably;
- protect the building;
- respect technical clearances;
- reduce vibrations and noise;
- clearly explain operation to the client;
- provide after-installation service.
Final Result: A Well-Integrated Midea Wall-Mounted System, Ready for Quebec's Seasons
The result of this installation in Deux-Montagnes is a compact, clean, and efficient system, perfectly suited to its location. The outdoor unit is well-elevated, stable, accessible, and correctly oriented. The conduits are carefully organized. The entire system integrates with the balcony without encroaching on it.
For the client, this means improved indoor comfort, reliable air conditioning during hot periods, a practical heating option during mid-season, and an installation that respects the available space. For AirGreen, this project represents exactly what we aim for in every HVAC installation: a well-thought-out solution, rigorously installed, and adapted to the building's reality.
This MIDEA35 12,000 BTU wall-mounted heat pump in Deux-Montagnes shows that a successful project does not only depend on the brand or the number of BTUs. It depends on analysis, expertise, precision, and attention to detail. This combination is what allows for a high-performance, durable, and pleasant-to-use system in daily life.
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).