Installation of a MIDEA35 18,000 BTU wall-mounted heat pump in Lorraine, on Montreal's North Shore
In Lorraine, AirGreen installs a MIDEA35 18,000 BTU wall-mounted heat pump on wall brackets: a clean, stable, and efficient mini-split solution for air conditioning and heating.
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 outdoor unit solidly installed on a brick wall, designed for durability and residential comfort
In Lorraine, on the North Shore, AirGreen installed a MIDEA35 18,000 BTU wall-mounted heat pump, a mini split system designed to provide both summer air conditioning and efficient supplementary heating for a large part of the year. This installation is distinguished by a detail visible from the first glance: the outdoor unit was installed on robust wall brackets, directly fixed to a foundation beneath a brick wall, in a clean, clear, and technically well-utilized outdoor space.
The photo illustrates a neat, stable, and well-aligned outdoor installation. The Midea unit is positioned at an adequate height from the ground, which better protects it against snow accumulation, splashes, fallen leaves, and debris. The choice of metal wall brackets, rather than a simple ground base, was particularly relevant in this residential context. In Lorraine, where many properties have well-maintained grounds and facades, it is essential that the installation is not only performant but also visually tidy.
This project perfectly demonstrates AirGreen's approach: precise location selection, equipment protection, adherence to building constraints, and delivery of a clean, durable, and easy-to-maintain HVAC installation.
Why the MIDEA35 18,000 BTU was perfectly suited for this Lorraine residence
The MIDEA35 18,000 BTU is an attractive solution for homeowners seeking a balance between comfort, efficiency, and air treatment capacity. A power of 18,000 BTU is often suitable for an open-concept area, a main floor, a large living room, a communicating kitchen, or a residential zone where the thermal load exceeds what a 12,000 BTU unit could comfortably cover.
In this residence in Lorraine, the need was clear: to obtain a wall-mounted heat pump solution capable of reliably improving indoor comfort, without imposing the more complex work of a complete central system. The choice of a mini split system precisely addresses this reality: a discreet indoor unit, a compact outdoor unit, efficient performance, and targeted installation.
At AirGreen, we always evaluate several elements before recommending a capacity:
- the surface area of the zone to be air-conditioned or heated;
- the orientation of the house;
- the insulation level;
- the amount of fenestration;
- the ceiling height;
- natural air circulation;
- the presence of stairs or open areas;
- the occupants' usage habits;
- the possible location of the outdoor unit;
- the necessary clearances for service and ventilation.
An 18,000 BTU heat pump must be installed rigorously. Its superior capacity requires an outdoor location capable of ensuring good air circulation around the unit, solid fastening, and sufficient access for HVAC maintenance. The photographed installation precisely meets these criteria.
An outdoor installation on wall brackets: a judicious technical choice
The outdoor unit visible in the photo is installed on two metal wall brackets, fixed under the brick cladding, in the lower part of the wall. This type of installation offers several important advantages in the Quebec climate.
Firstly, it keeps the appliance elevated from the ground. On the North Shore, snow accumulation, freeze-thaw cycles, and humidity near the ground can affect the operation and maintenance of a poorly positioned outdoor unit. By elevating the appliance, the risk of obstruction by snow is reduced, and natural drainage around the equipment is facilitated.
Secondly, a well-executed wall mounting improves the stability of the installation. The supports must be perfectly level, solidly anchored, and adapted to the weight of the unit. Poor fastening can lead to vibrations, noise, or premature wear. In this project, the alignment is clean, the unit rests solidly on its supports, and the installation maintains a professional appearance.
Finally, this choice simplifies maintenance. The space under the unit allows for keeping the area clean, more easily checking the overall condition of the appliance, and clearing the surroundings in winter.
A brick facade that demands precision and method
Installing an outdoor unit near a brick wall requires special attention. Brick is solid, but it does not allow for improvisation. It is necessary to choose the right fixing points, use appropriate anchors, limit vibrations transmitted to the building, and respect recommended clearance distances.
In this installation in Lorraine, our technicians worked to preserve the integrity of the wall and ensure a durable installation. The outdoor unit is placed in front of a clear area, with a facade that allows for good air evacuation. The front fan has the necessary space to operate efficiently, which is essential for maintaining the system's performance in both air conditioning and heating.
This step is often underestimated. However, a poorly positioned outdoor unit can lose efficiency, produce more noise, or become more difficult to maintain. At AirGreen, we consider the outdoor location as a central part of the project, not just a mere formality.
The role of the outdoor unit in the overall system performance
In a mini split system, the outdoor unit plays an essential role. It contains major components, including the compressor and the outdoor heat exchanger. Its ability to breathe freely directly influences performance, energy consumption, and the stability of indoor comfort.
The photo shows a Midea unit cleanly installed, with a fully clear ventilation grille. This detail is important: air must circulate without obstruction. A unit squeezed into a corner, too close to a fence, a side wall, or a plant obstacle can work harder than necessary. This can increase energy consumption and reduce the lifespan of components.
For this project, we therefore validated the available space, clearances, orientation, and accessibility. This approach allows the client to benefit from a more reliable, better ventilated, and easier-to-maintain system.
An 18,000 BTU capacity for stable comfort
The MIDEA35 18,000 BTU offers a capacity suitable for more demanding areas than a simple bedroom or small office. In a Lorraine home, this power can meet the needs of a main living area, an open space, or a floor where summer heat quickly accumulates.
In this case, the choice of the 18,000 BTU provided a valuable capacity reserve while maintaining efficient use. The goal was to offer consistent comfort, especially during the hot and humid days typical of the Montreal region, but also during cooler periods when heat pump heating becomes practical.
An air conditioning and heating solution adapted to the North Shore
Homeowners in Lorraine, Laval, Blainville, Rosemère, Boisbriand, and other areas of the North Shore often seek HVAC solutions capable of meeting needs across multiple seasons. A modern wall-mounted heat pump precisely offers this versatility: cooling in summer, heating in transitional seasons, improving comfort in a specific zone, and reducing dependence on certain supplementary heating systems.
This installation is part of that logic. The MIDEA35 18,000 BTU allows the client to better control the temperature of the targeted zone, without having to modify the entire house's infrastructure. For many residences, this is an excellent compromise between performance, budget, ease of installation, and daily comfort.
The importance of a clean installation for property value
An outdoor installation is visible. It is part of the general appearance of the house. This is why AirGreen places great importance on the finish. In the photo, the unit is straight, the supports are aligned, the appliance is installed at a consistent height, and the overall look remains understated.
A poor installation can detract from a facade's appearance or create an impression of shoddy work. Conversely, a well-thought-out installation respects the house's architecture and inspires confidence. In residential areas like Lorraine, where properties are generally well-maintained, this attention to detail is particularly important.
We always aim for a result that combines:
- technical performance;
- safety;
- mechanical stability;
- ease of maintenance;
- visual integration;
- respect for the existing building.
Key steps carried out by AirGreen
For this project, our team followed a structured method to ensure the quality of the installation.
1. Location Analysis
Before fixing the supports, we evaluated the outdoor area: available wall, ground height, clearance in front of the unit, access for connections, and ease of maintenance. This analysis prevents costly corrections once the appliance is installed.
2. Installation of wall brackets
The supports were installed carefully to ensure a solid and level base. This point is crucial to avoid vibrations and ensure the proper functioning of the outdoor unit.
3. Positioning of the Midea unit
The outdoor unit was placed on the supports, aligned, and then secured. The positioning allows for good air circulation and maintains a practical space under the appliance.
4. Technical connections
Refrigeration, electrical, and control connections must be carried out according to trade rules. A reliable HVAC installation depends as much on these invisible details as on the final appearance.
5. Checks and commissioning
Once the installation is complete, we perform the necessary tests: operation, unit response, stability, drainage, noise, ventilation, and controls. The client then receives essential advice on how to use and maintain their system.
Common mistakes to avoid with a wall-mounted heat pump
When a homeowner shops for a heat pump, they may be tempted to focus solely on the appliance's price. However, the quality of the installation strongly influences the final result.
Among the most common mistakes are:
- choosing a capacity without a real assessment of the home;
- installing the outdoor unit too close to the ground;
- neglecting ventilation clearances;
- fixing the appliance on inadequate supports;
- ignoring potential vibrations;
- underestimating the importance of drainage;
- forgetting future access for maintenance;
- choosing a contractor without experience in mini split systems.
In this project in Lorraine, each of these errors was avoided thanks to precise planning. The outdoor unit is elevated, well-cleared, solidly installed, and visually clean.
HVAC maintenance: protecting the client's investment
A well-installed MIDEA35 18,000 BTU wall-mounted heat pump must also be well-maintained. The outdoor unit must remain clean, clear, and accessible. In autumn, leaves can accumulate around the unit. In winter, snow and ice must be monitored. In spring, a visual cleaning helps check if the space around the unit is still clear.
We recommend that homeowners:
- maintain at least good clearance around the outdoor unit;
- remove leaves, branches, and debris;
- avoid leaning objects against the appliance;
- monitor snow accumulation;
- clean the indoor unit filters regularly;
- schedule professional maintenance based on usage.
Proper HVAC maintenance helps maintain energy efficiency, comfort, and system lifespan.
Subsidies and eligibility: an aspect to check according to the exact model
Financial assistance programs can represent a significant advantage for certain homeowners who install an eligible heat pump. However, eligibility depends on the precise model, current criteria, certified performance, and the requirements of the applicable program at the time of installation.
At AirGreen, we support our clients so they have the necessary information: brand, model, capacity, invoice, technical documentation, and data related to the installed equipment. For clients in Montreal, Laval, Longueuil, the North Shore, and the South Shore, this assistance can facilitate the process and reduce uncertainties.
In the case of a MIDEA35 18,000 BTU, it is important to validate the exact information associated with the installed combination, as subsidies are generally linked to precise technical criteria.
A clear customer experience from start to finish
The client was looking for an efficient solution, cleanly installed, without compromising the exterior appearance of the house. Our team took the time to explain the choice of location, the reason for the wall mounts, the operating instructions, and good maintenance practices.
This transparency is part of how we work. A successful installation is not limited to installing the equipment; it also includes the client's understanding of the system. When the owner knows how to use their wall-mounted heat pump, how to adjust the settings, and how to maintain the appliance, daily comfort significantly improves.
AirGreen, local expertise for Montreal, Laval, Longueuil, the North Shore and the South Shore
AirGreen installs wall-mounted heat pumps, wall-mounted air conditioners, and mini split systems throughout the greater Montreal area, including Laval, Longueuil, the North Shore, and the South Shore. Each sector requires a different approach. In Lorraine, residential properties often require careful, durable, and discreet installation. In Montreal, space constraints are sometimes more significant. In Laval or on the South Shore, exterior access can vary greatly depending on the type of house.
Our strength is adapting to the actual building, rather than mechanically repeating the same method everywhere. This project in Lorraine is a good example: a well-elevated outdoor unit, securely fastened, cleanly installed, and designed to withstand local conditions.
A Midea installation focused on stability and ease of use
The MIDEA35 18,000 BTU installed in this residence offers the client a concrete solution to improve their comfort without complicating their daily life. The system is designed to be easy to use, effective in the targeted area, and adapted to the needs of a household that wishes to better manage its indoor temperature.
The choice of the outdoor unit on wall mounts reinforces this logic of durability. The installation better protects the appliance, facilitates access, and reduces risks associated with direct contact with the ground. In a region where weather conditions can change rapidly, this type of technical decision contributes to the overall quality of the project.
A final result compliant with AirGreen standards
This installation of a MIDEA35 18,000 BTU wall-mounted heat pump in Lorraine demonstrates the importance of well-planned work. The outdoor unit is cleanly positioned, the facade is respected, the supports are solid, and the appliance has the necessary space to operate efficiently.
For the client, the result is simple: more comfort, a reliable air conditioning solution for the summer, practical heating for several periods of the year, and an outdoor installation that inspires confidence. For AirGreen, this project represents exactly the type of intervention we like to carry out: technical, precise, clean, and adapted to the realities of the house.
Whether in Lorraine, Montreal, Laval, Longueuil, on the North Shore, or on the South Shore, our priority remains the same: to offer a durable, high-performance, and well-integrated HVAC installation.
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).