Installation of a MIDEA35 18,000 BTU Wall-Mounted Heat Pump in Boucherville: a discreet Mini Split air conditioner installed above an interior door to maximize comfort
AirGreen installs a MIDEA35 18,000 BTU wall-mounted heat pump in Boucherville: discreet unit above a door, efficient comfort, and neat HVAC installation on the South Shore.
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The unit’s data sheet
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 article, chapter by chapter
A Midea wall-mounted installation designed for strategic airflow in a Boucherville residence
In Boucherville, this installation of a MIDEA35 18,000 BTU wall-mounted heat pump was carried out in a residential setting where the placement of the indoor unit played a crucial role in the quality of comfort achieved. The project image clearly shows a carefully considered installation choice: the Midea wall unit was positioned above an interior door, in a passageway allowing efficient air distribution to the main area of the residence, while keeping the side walls free and the existing layout intact.
This type of installation is particularly relevant in homes and dwellings on the South Shore, where interior configurations do not always allow for a wall-mounted air conditioner to be placed on a large, clear wall. In many Boucherville residences, rooms communicate through corridors, open doors, semi-open areas, or transition zones between the living room, bedrooms, kitchen, and bathrooms. The objective is therefore not only to install a high-performance machine but to choose a location that allows air to circulate naturally, without creating uncomfortable drafts or hindering the daily use of the room.
At AirGreen, we recommended and installed this MIDEA35 18,000 BTU heat pump with three priorities in mind: performance, discretion, and quality of finish. The result is a clean, compact, and well-integrated HVAC installation, with an indoor unit perfectly aligned above the opening, high enough to free up living space, but positioned to remain easily accessible for regular maintenance.
The temperature displayed on the unit, visible in the photo, indicates a system already in operation and well-configured. The appliance's white facade blends into the interior decor, while its placement above the door helps to limit the visual impact in the room. This detail is very important for owners who wish to improve their comfort without transforming the appearance of their residence.
Why choose a MIDEA35 18,000 BTU for a Boucherville residence?
The 18,000 BTU capacity is suitable for larger areas than a 9,000 or 12,000 BTU system, while remaining flexible enough for residential use. In this Boucherville project, the MIDEA35 18,000 BTU was selected to meet a broader comfort need: effectively air conditioning a living area or a significant portion of the house, while also offering a practical heating solution during cooler periods.
A wall-mounted heat pump of this capacity can be particularly interesting when a large room, a partial floor, an open-plan area, or a space with several interior openings needs to be treated. Actual performance always depends on insulation, sun exposure, ceiling height, number of windows, room layout, and occupant habits. It is precisely for this reason that a professional evaluation remains indispensable before installation.
In this case, the choice of a MIDEA35 18,000 BTU met several concrete objectives:
- improve summer comfort with a quiet and stable wall-mounted air conditioner;
- add an efficient heating source during mid-season;
- avoid the clutter of a portable or window unit;
- maintain a simple and clean interior appearance;
- optimize air distribution from a central point;
- reduce temperature variations between adjacent zones.
For homeowners in Boucherville, as well as Longueuil, Saint-Bruno-de-Montarville, Saint-Lambert, Varennes, Sainte-Julie, and other areas of the South Shore, this type of appliance is often a very balanced solution combining performance, cost, comfort, and ease of use.
Placement above a door: a technical solution requiring precision
Installing an indoor unit above a door is not a choice to be taken lightly. The available space is often limited in height, door frames impose constraints, and the wall structure, pipe routing, condensate drainage slope, and future accessibility must all be considered.
In this Boucherville installation, the Midea unit was placed to respect the necessary clearances around the appliance. The ceiling is relatively close, but the appliance maintains the required space to function correctly. This precision is important: a wall-mounted unit installed too close to the ceiling may not draw in ambient air properly, lose efficiency, or become noisier. A unit installed too low can obstruct passage, create an uncomfortable direct air jet, or detract from the room's aesthetics.
Our team carefully adjusted the positioning so that the appliance is:
- visually centered above the door;
- installed at a functional height;
- oriented for good air distribution;
- accessible for filter cleaning;
- cleanly connected to the pipes;
- integrated without harming the door frame or interior finishes.
This type of work requires experience. In a wall-mounted HVAC installation, a few centimeters can make a big difference, both for performance and for the final appearance.
Air distribution adapted to communicating rooms
One of the advantages of the placement visible in the photo is the ability to diffuse air into a passageway. The unit installed above the door can project air into the main space while promoting some circulation to adjacent rooms when doors remain open. In many Boucherville homes, this configuration helps stabilize the temperature without unnecessarily multiplying the number of wall-mounted units.
However, a common mistake must be avoided: believing that a single wall unit can always perfectly air condition all closed rooms in a house. Air circulates well in open spaces, but much less so in closed bedrooms or rooms separated by several walls. That is why we always clearly explain to clients what a wall-mounted Mini Split can do, and what it cannot guarantee.
In this project, the MIDEA35 18,000 BTU was installed in a position that maximizes its real potential. Air distribution was designed according to the daily use of the house, and not just according to where it was easiest to drill through the wall. This approach distinguishes a quick installation from a truly professional one.
The technical and practical details that make the difference in this AirGreen project
A wall-mounted heat pump operates thanks to a set of elements that must be perfectly coordinated: indoor unit, outdoor unit, refrigerant lines, communication wiring, electrical supply, condensate drain, wall sealing, vacuuming, and startup. Even if the image mainly shows the indoor unit, the quality of the final result depends on everything that is also behind the wall and outside.
Interior finish: simple, clean, and durable
In this Boucherville residence, visual integration was a priority. The white Midea unit blends well with the pale walls and door frame. The installation above the opening preserves the lateral wall space, which is particularly useful when the room already contains decorative elements, furniture, or narrow passages.
A good interior finish relies on several details:
- the unit must be perfectly level;
- connections must be concealed or neatly organized;
- the wall must be drilled with precision;
- edges and openings must be well sealed;
- the drain must follow an adequate slope;
- access to filters must remain simple.
These elements are often invisible when the installation is successful. Yet, they determine the system's durability and customer satisfaction. A poorly angled indoor unit, a poorly planned drain, or a poorly sealed wall can lead to drainage, humidity, noise, or maintenance problems.
Expected performance of an 18,000 BTU wall system
A MIDEA35 18,000 BTU offers an interesting capacity for homeowners who want to improve the comfort of a significant space without installing a complete central system. For air conditioning, it can quickly cool a targeted area while maintaining a stable temperature when the appliance is correctly sized. For heating, it can provide very useful supplementary heat during cool spring and autumn days, and depending on conditions, contribute to comfort during part of the winter.
The choice of an 18,000 BTU capacity must always be validated according to the residence. An appliance that is too small risks running continuously. An appliance that is too large may reach the desired temperature too quickly without properly managing humidity. In this project, the chosen capacity corresponded to the volume of air to be treated and the configuration of the serviced area.
At AirGreen, we take the time to explain the importance of sizing to the client. A heat pump is not just an appliance with a BTU number listed on a technical sheet. It is a solution that must be adapted to the building, the occupants' lifestyle, and comfort expectations.
A relevant solution for Boucherville and the South Shore
Boucherville presents an interesting mix of residences: single-family homes, condos, plexes, renovated homes, older sectors, and newer constructions. Each type of building imposes its own constraints. In some cases, the issue is exterior access. In others, it is interior air distribution. Sometimes, one has to deal with brick walls, soffits, balconies, confined spaces, or co-ownership rules.
This installation clearly demonstrates our ability to adapt our methods. We regularly carry out similar projects in Montreal, Laval, Longueuil, on the North Shore and South Shore, but each residence requires a different interpretation. The chosen location in Boucherville is not a standard choice applied without thought; it is a precise response to a particular interior space.
Key steps of this HVAC installation
To achieve a reliable result, our team follows a rigorous method. For a project like this, the main steps include:
- assessment of the interior space and the area to be air-conditioned;
- validation of the best location for the wall unit;
- analysis of pipe routing to the exterior;
- installation of the wall plate with precise alignment;
- controlled drilling with adequate slope;
- routing of refrigerant lines, cable, and drain;
- installation of the outdoor unit according to required clearances;
- refrigerant and electrical connections;
- leak test;
- system vacuuming;
- system startup;
- verification of operating modes;
- explanation of settings to the client.
Vacuuming and leak tests are essential. They protect the compressor, ensure proper refrigerant function, and prevent performance loss. A beautiful indoor unit is not enough: the system must be technically sound from the inside out.
Mistakes to avoid when installing above a door
Installation above a door can yield excellent results, but only if it's well-planned. The most common mistakes are:
- installing the unit too close to the ceiling;
- neglecting the space needed to open the front panel;
- forgetting filter access;
- placing the unit off-center or visually unbalanced;
- poorly managing the condensate drain;
- routing pipes through a difficult-to-maintain location;
- directing the airflow directly into an uncomfortable area;
- choosing a capacity that is too high or too low for the actual space.
For this project in Boucherville, these points were anticipated. The unit is installed cleanly, the clearance is consistent with the available space, and the position allows for good air diffusion without compromising circulation in the house.
Usage tips to maximize comfort
Once the wall-mounted heat pump is installed, usage habits play an important role. To achieve optimal comfort with a MIDEA35 18,000 BTU, we generally recommend:
- setting a stable temperature rather than making frequent large changes;
- using the air direction vanes to avoid prolonged direct airflow;
- cleaning filters regularly;
- keeping doors open when the goal is to temper multiple zones;
- avoiding blocking the airflow with tall furniture or curtains;
- having the system periodically inspected by a professional.
Regular HVAC maintenance helps maintain efficiency, reduce noise, improve air quality, and extend the system's lifespan. Clogged filters are one of the most common causes of performance decline. Cleaning is simple but must be done consistently.
Subsidies and eligibility: a point to check before installation
Many clients in Boucherville and on the South Shore ask us about available subsidies for wall-mounted heat pumps. Eligibility depends on the exact model, certified performance, current program criteria, and documents provided after installation. Rules can change, and it is important to validate information at the time of the project.
At AirGreen, we help our clients understand the necessary procedures and documents. A clear invoice, model information, serial numbers, and proof of installation may be required depending on the applicable program. For a client, this step is important because it influences the net cost of the project.
The MIDEA35 18,000 BTU can be an interesting option when its characteristics match the desired criteria. Our role is to support the client transparently, without promising a subsidy that has not been validated according to the exact conditions at the time.
Why AirGreen for a heat pump installation in Boucherville?
A good wall-mounted air conditioner installation relies on experience, precision, and the ability to adapt the solution to the building. In Boucherville, this project allowed us to demonstrate our approach: analyze the space, choose an intelligent location, install cleanly, and provide the client with a system that is simple to use.
We regularly operate in the greater Montreal area, particularly in Montreal, Laval, Longueuil, on the North Shore and the South Shore. This field presence allows us to quickly recognize the typical challenges of Quebec residential buildings: load-bearing walls, low ceilings, close doors, passageways, balconies, brick facades, electrical constraints, and aesthetic requirements.
Our advantage is not limited to providing a machine. We install a complete solution, with particular attention to durability, cleanliness of the work site, acoustic comfort, energy performance, and the customer's experience after installation.
Final result: a well-positioned, discreet, and efficient Midea 18,000 BTU
The result of this installation in Boucherville is a MIDEA35 18,000 BTU wall-mounted heat pump well integrated into the interior space. The unit is positioned above the door, which frees up walls, promotes strategic air diffusion, and maintains a sober appearance. The room remains functional, the appliance remains accessible, and comfort can be managed easily on a daily basis.
This project shows that a successful installation is not just about mounting a unit on the wall. It requires an understanding of the building, good airflow reading, rigorous technical execution, and a clean finish. For Boucherville homeowners looking for an effective heating and air conditioning solution, the MIDEA35 18,000 BTU is a solid option when installed methodically.
At AirGreen, we approach every project with the same demand: to propose an adapted solution, install with precision, and ensure a lasting result. This installation on the South Shore is an excellent example.
The job tools
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.
How the job unfolds
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 we check on a job like this one
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.
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.
Good habits, once the unit is in place
Six simple habits that keep the unit going. Your list stays on this device.
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.
The right pages, at the right time
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).