Installation of a MIDEA35 18,000 BTU Wall-Mounted Heat Pump - Air Conditioner - Mini Split in Oka, on the North Shore
In Oka, AirGreen installed a MIDEA35 18,000 BTU wall-mounted heat pump with a discreet indoor unit near the ceiling, ideal for efficiently cooling and heating a large residential area.
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 Wall-Mounted Heat Pump Discreetly Installed in an Oka Residence
In Oka, on the North Shore, AirGreen carried out the installation of a MIDEA35 18,000 BTU wall-mounted heat pump, a mini split system designed to offer stable comfort, efficient air conditioning, and powerful supplemental heating in a residence where interior aesthetics were as important as technical performance. The project photo shows the indoor unit installed high on the wall, near a ceiling molding, in a bright space with light tones. The result is understated, clean, and perfectly integrated into the decor.
This type of installation requires more than just positioning the appliance. In a house in Oka, where rooms can be open, ceilings sometimes higher, and sunlight variable depending on the building's orientation, the choice of an 18,000 BTU wall-mounted heat pump must be carefully validated. Too low a capacity could have left certain areas uncomfortable during hot days or colder periods. Too high a capacity, if poorly assessed, could have undermined comfort stability. Here, the MIDEA35 18,000 BTU represented a solution well-suited to the residence's configuration and the client's expectations.
The objective was clear: improve comfort in a main area without compromising the room's appearance. The client wanted a high-performing yet discreet system. The indoor unit, with its white casing and simple lines, integrates into the environment without unnecessarily drawing attention. This attention to detail is essential in a residential installation, because a successful HVAC installation must not only function efficiently but also respect the living space.
Why the MIDEA35 18,000 BTU was a pertinent choice for this house in Oka
The MIDEA35 18,000 BTU is an interesting solution for homeowners looking for a wall-mounted heat pump capable of treating a larger area than a standard enclosed room. In this project in Oka, the 18,000 BTU capacity allowed for a better response to the needs of an open residential space, where air must circulate constantly to maintain a pleasant temperature.
This model serves as both a wall-mounted air conditioner and a heat pump heating system. In summer, it efficiently cools the room while also helping to dehumidify the air. In mid-season and during several periods in winter, it can also contribute to heating, depending on external conditions and building needs. For homeowners on the North Shore, this dual function represents a significant advantage, especially when seeking to reduce reliance on main heating during milder periods.
A capacity adapted to open spaces
18,000 BTU systems are often preferred for main living areas, open-plan living rooms, spaces combining living room and dining room, or certain areas with higher ceilings. Their capacity allows for better air reach, provided the indoor unit is positioned correctly.
In this installation, the unit is placed near the ceiling, on an unobstructed wall. This positioning promotes efficient air distribution throughout the room. The goal is not to blow directly on occupants, but to create a comfortable, stable, and evenly distributed airflow. At AirGreen, we place great importance on this aspect, as poor placement can cause unpleasant drafts, overly cold zones in summer, or a sensation of uneven heating.
A discreet and well-aligned indoor unit
The photo shows a wall unit installed cleanly, with careful alignment relative to the ceiling and existing moldings. In a residence with light-colored walls and a minimalist decor, the slightest imperfection becomes visible. A poorly centered, too low, or unleveled installation would have detracted from the overall appearance of the room.
Our team therefore paid particular attention to the height, level, visual balance, and space required for the unit's operation. A wall-mounted heat pump must maintain sufficient clearance around the indoor unit to ensure good air intake and adequate distribution. The aesthetic aspect must never compromise performance.
More stable comfort thanks to mini split technology
The mini split technology allows the heat pump to modulate its operation according to actual needs. Rather than operating solely in abrupt on-off cycles, the system adjusts its capacity to maintain a more constant temperature. For the client, this translates to fewer temperature variations, quieter operation, and a better feeling of comfort.
This stability is particularly appreciated in homes located near the lake or in more wind-exposed areas, like certain parts of Oka. Heating and cooling needs can vary rapidly depending on sunlight, humidity, and the season. A well-installed MIDEA35 wall-mounted heat pump helps smooth out these daily variations.
Specifics of this interior installation in Oka
Ceiling-level installation with respect for moldings
One of the most visible elements of this project is the proximity of the indoor unit to the ceiling molding. This detail requires a great deal of precision. Sufficient clearance for air intake must be maintained, while respecting the appearance of the wall. A unit installed too close to the ceiling could hinder air circulation. A unit installed too low could become too conspicuous or less effective in distribution.
In this project, our team found the right balance. The unit is positioned high enough to remain discreet, but in a way that allows it to function correctly. The visual result is clean, with minimal presence in the room.
A light-colored wall that demands impeccable finish
On a white or cream wall, finishing details are easily noticed. Traces, approximate cuts, misaligned conduits, or marks around the unit can detract from the final appearance. This is why our working method includes careful preparation, clean handling of the appliance, and a complete visual check after installation.
At AirGreen, we know that installing a wall-mounted air conditioner in a living space is not just a technical job. It's also an intervention in a personal space. The client must be able to enjoy comfort without feeling that the appliance has been added in an improvised manner.
The right diffusion angle to avoid discomfort
A common mistake in wall-mounted installations is to place the unit where it's easy to install, rather than where it will be comfortable to use. Air should not be aggressively directed towards a sofa, bed, workstation, or high-traffic area. In this Oka residence, the positioning was chosen to promote broad and pleasant diffusion.
An 18,000 BTU wall-mounted heat pump has a greater ventilation capacity than a small appliance. Therefore, how the air will circulate in the space must be planned. A well-thought-out installation helps avoid common complaints: room too cold near the unit, uneven temperature, perceived noise, or a feeling of drafts.
Coordination between interior and exterior
Even if the photo highlights the indoor unit, a successful installation also depends on the path between the indoor and outdoor units. Refrigerant lines, drainage, electrical supply, and component protection must be precisely planned. In Oka, as in several areas of the North Shore, winter conditions, snow accumulation, humidity, winds, and accessibility for HVAC maintenance must be taken into account.
Indoor work can never be separated from outdoor work. An elegant finish inside must be accompanied by a reliable, compliant, and durable connection outside.
Key steps in our HVAC installation
Analysis of client needs
Before proceeding with the installation, we validated the client's actual needs: area to be treated, room orientation, ceiling height, insulation level, usage habits, and expectations for air conditioning and heating. This step confirms that the MIDEA35 18,000 BTU meets the demand.
A good HVAC installation always begins with an honest analysis. The largest model is not always the best. The cheapest model is not always the most cost-effective. The right choice depends on the building, its use, and the quality of the installation.
Selection of interior location
The interior location was chosen to maximize air diffusion while maintaining a discreet appearance. The selected wall offered a high position, good reach into the room, and successful visual integration. The unit's white casing naturally blends into the environment.
We also considered future access to the filters. Regular HVAC maintenance requires the unit to be easily accessible. An appliance installed in a location that is too complicated to reach risks being less well maintained, which can reduce its efficiency over time.
Drilling, connections, and building protection
Installing a mini split system involves running refrigerant lines and a condensation drain. Each drilling must be done carefully to protect the building structure. Sealing, drain slope, connection quality, and protection against infiltration are essential elements.
In homes in the Montreal, Laval, Longueuil, North Shore, and South Shore regions, climatic conditions make this rigor indispensable. Water, frost, and temperature variations can quickly reveal a poorly executed installation.
Full commissioning
Once the appliance was installed, we proceeded with commissioning. This step includes checking startup, testing operating modes, validating air diffusion, controlling drainage, and observing the system's general behavior.
Commissioning also allows us to explain to the client proper usage practices: choice of modes, recommended temperature, filter cleaning, and signs to watch out for. A well-used heat pump offers better comfort and a longer lifespan.
What the client gains with this installation
Immediate comfort in the main zone
The MIDEA35 18,000 BTU brings a concrete change to the residence. The room becomes more pleasant in summer, especially on humid days when a simple fan is not enough. In cooler periods, the system offers gentle and rapid heat, particularly useful before relying more heavily on the main heating.
For a house in Oka, this flexibility is a significant advantage. Intermediate seasons can be variable, with cool mornings and milder afternoons. The heat pump allows for comfort adjustment without overheating the entire house.
Better humidity management
Comfort doesn't just depend on temperature. Humidity plays a major role, especially in the greater Montreal area and near waterfront zones. In cooling mode, a well-sized wall-mounted air conditioner helps remove excess humidity, making the indoor air more pleasant.
However, an improperly sized installation can reduce this advantage. An oversized appliance that runs in too short cycles does not always dehumidify correctly. This is why the choice of capacity and the quality of commissioning are so important.
A discreet solution for a living space
The indoor unit visible in the photo demonstrates that an HVAC system can be integrated with finesse. The client achieves a significant improvement in comfort without sacrificing the room's appearance. The appliance remains present, yet discreet, which is very suitable for a residence where interior aesthetics are important.
A lasting investment
The durability of a wall-mounted heat pump depends on several factors: model quality, sizing accuracy, location, connections, maintenance, and usage. With a professional installation, the client starts on a good footing. The appliance can provide reliable performance for many years, provided regular maintenance is maintained.
Practical advice for homeowners considering a wall-mounted heat pump
Do not choose the location based solely on appearance
Aesthetics count, but they must be reconciled with performance. An indoor unit that is too hidden, too close to a ceiling, too close to an obstacle, or poorly oriented can reduce comfort. The right location must allow for good air circulation, easy access to filters, and comfortable diffusion.
Validate capacity according to the actual room
An 18,000 BTU wall-mounted heat pump is suitable for many spaces, but not all situations. Area alone is not enough. Insulation, number of windows, sun exposure, ceiling height, and room usage must also be considered. At AirGreen, we evaluate these elements before recommending a model.
Plan for maintenance from the outset
Filters must be cleaned regularly. The outdoor unit must remain clear. Periodic inspection helps maintain performance. HVAC maintenance is not a formality: it directly influences the efficiency, noise, air quality, and lifespan of the system.
Entrust connections to a qualified team
Mini split systems use refrigerant lines and require precise working methods. An approximate installation can cause leaks, performance loss, or costly repairs. It is essential to entrust the work to an experienced, equipped team accustomed to the realities of the Quebec climate.
AirGreen, local expertise for Oka, Montreal, Laval, Longueuil, the North Shore, and the South Shore
AirGreen regularly participates in residential projects where comfort, energy efficiency, and finishing quality must go hand in hand. This installation of a MIDEA35 18,000 BTU wall-mounted heat pump in Oka reflects our way of working: serious analysis, selection of an adapted model, clean installation, and genuine attention to both visible details and less apparent technical elements.
We serve Montreal, Laval, Longueuil, the North Shore, and the South Shore, with a focus on quality execution. Every house has its constraints. Every client has their priorities. Our role is to transform these parameters into a reliable, comfortable, and well-integrated HVAC solution.
In this project, the main challenge was to combine an 18,000 BTU capacity with a discreet indoor presence. The unit needed to be well-placed, well-aligned, and functional, without disrupting the room's appearance. The final result meets these requirements: a powerful heat pump, an efficient wall-mounted air conditioner, a visually clean installation, and improved comfort for the client.
For homeowners in Oka and the surrounding areas considering the installation of a mini-split, this project demonstrates the importance of careful planning at every stage. Success does not solely depend on the brand or capacity of the unit. It relies on the entire work: sizing, location, connections, drainage, commissioning, and usage advice. This rigor is what allows an HVAC installation to deliver its true value throughout the seasons.
The unit on this job, in figures
The range as published on airgreen.ca: pick a size to see its capacity in deep cold.
| Size | Heating at −8 °C | Heating at −15 °C | Coldest certified point | COP at −15 °C | SEER | HSPF | Indicative LogisVert aid |
|---|---|---|---|---|---|---|---|
| Midea Série 35 9 000 | 11,000 | 13,500 | −30 °C: 7,500 | 2.0 | 33.3 | 14.6 | – |
| Midea Série 35 12 000 | 11,000 | 13,500 | −30 °C: 7,500 | 2.0 | 29.4 | 12.7 | $1,320 |
| Midea Série 35 18 000 | 19,300 | 22,600 | −30 °C: 11,900 | 2.34 | 25.6 | 16.2 | $2,316 |
According to NEEP, its certified maximum capacity at −30 °C (−22 °F) is 7,500 BTU/h, 83% of its nominal 9,000 BTU size.
At 8 °C, its certified maximum capacity reaches 17,200 BTU/h, 91% more than its nominal 9,000 BTU size.
According to NEEP, its certified heating capacity at −15 °C (5 °F) is 13,500 BTU/h, 150% of its nominal 9,000 BTU size. Its COP there is 2.00.
According to NEEP, its certified maximum capacity at −30 °C (−22 °F) is 7,500 BTU/h, 62% of its nominal 12,000 BTU size.
At 8 °C, its certified maximum capacity reaches 17,200 BTU/h, 43% more than its nominal 12,000 BTU size.
According to NEEP, its certified heating capacity at −15 °C (5 °F) is 13,500 BTU/h, 112% of its nominal 12,000 BTU size. Its COP there is 2.00.
According to NEEP, its COP at −15 °C is 2.34: the highest of the Série 35 line, which ranges from 2.00 to 2.00 at that temperature.
According to NEEP, its certified maximum capacity at −30 °C (−22 °F) is 11,900 BTU/h, 66% of its nominal 18,000 BTU size.
At 8 °C, its certified maximum capacity reaches 29,700 BTU/h, 65% more than its nominal 18,000 BTU size.
Data read live from the airgreen.ca page of each size (NEEP / AHRI certified performance). When the title names the installed size, it is highlighted; otherwise the whole range is shown. The aid shown is today’s, using Hydro-Québec’s rule ($120 per 1,000 BTU/h at −8 °C); amounts quoted in the article date from its publication. Only Hydro-Québec confirms the assistance granted.A dash in the aid column: amount to be confirmed for this model.
The big day, step by step
The main steps of this kind of job at AirGreen. Every house has its quirks: the estimate brings them out.
We look at the room, the outside wall, the line route and where the outdoor unit will go. That is where the capacity gets chosen.
Model, capacity and price, in writing. We also check whether the model qualifies for assistance programs.
Floors and furniture protected, wall plate position marked level, wall opening located.
A single opening, with the slope the drain needs to flow outside.
Set on a stand raised above the snow, with the clearances the manufacturer requires.
Connected, insulated and protected. The opening is then sealed against water, cold air and insects.
A dedicated circuit and an accessible disconnect near the outdoor unit.
Leak test, vacuum, then start-up and a check of heating and cooling.
Remote, modes, filters: we show you the essentials before we leave.
- The on-site estimateWe look at the room, the outside wall, the line route and where the outdoor unit will go. That is where the capacity gets chosen.
- The quoteModel, capacity and price, in writing. We also check whether the model qualifies for assistance programs.
- Getting readyFloors and furniture protected, wall plate position marked level, wall opening located.
- The wall openingA single opening, with the slope the drain needs to flow outside.
- The outdoor unitSet on a stand raised above the snow, with the clearances the manufacturer requires.
- Lines, cable and drainConnected, insulated and protected. The opening is then sealed against water, cold air and insects.
- The electrical workA dedicated circuit and an accessible disconnect near the outdoor unit.
- Tests and start-upLeak test, vacuum, then start-up and a check of heating and cooling.
- The walkthroughRemote, modes, filters: we show you the essentials before we leave.
What would it look like at your place?
Two quick checks with real numbers: what heat costs, and what your current heaters add up to in BTU/h.
Baseboards and electric furnaces turn 1 kWh of electricity into 1 kWh of heat. A heat pump delivers more: that is its COP. At Hydro-Québec’s rate D (11.142¢/kWh above 40 kWh a day, since 1 April 2026):
Hydro-Québec: a heat pump can be up to three times more efficient than baseboards for heating in the colder months.
Estimate per kWh of heat, at the chosen temperature, using the certified COP from the product page. Taxes, access charge and backup heat not included.
Conversion: 1 W = 3.412 BTU/h. An indication, not a load calculation: baseboards and furnaces are often stronger than the real need, and they can stay as backup. AirGreen confirms the capacity on site.
Four mistakes we do not make
Flip each card to see what we do instead.
Your own project, step by step
What to do, season by season
Three habits per season for this unit. They take a few minutes and prevent many calls.
- Clean the indoor unit's filters.
- Clear leaves and debris left on the outdoor unit by winter.
- Test cooling before the first hot days.
- Clean the filters more often when the unit runs a lot.
- Keep plants away from the outdoor unit.
- Check that no water drips from the indoor unit.
- Rake the leaves around the outdoor unit.
- Test heating before the first cold days.
- Book periodic maintenance before winter.
- Keep snow away from the stand and the front of the unit.
- Let the unit defrost: it is normal.
- Never hit the ice on the fins; call us if the unit stays iced up.
Is your home ready?
Check what applies at your place. A "no" is not a refusal: it is what we sort out during the estimate.
Four statements: true or false?
It all comes down to details you have just seen.
1. In heating mode, the outdoor unit can produce water.
During defrost cycles. That water must drain away without forming ice.
2. You pick the capacity with a simple square-footage rule.
Windows, insulation, orientation and how the room is used all count. Capacity is chosen on site.
3. A multi-zone connects several indoor heads to a single condenser.
One head per room, all on the same condenser. Each room keeps its own temperature.
4. The disconnect can sit behind the patio furniture.
It must stay accessible: it is what shuts the unit off for service.
0 / 4 right answers
What people ask us about this kind of work
Does a wall-mounted heat pump heat in winter?
Wall-mounted or multi-zone: how do I choose?
Where does the outdoor unit go?
Are there grants?
Do I need a permit?
How cold can it heat?
How much can I save?
How is the LogisVert assistance calculated?
Is it noisy?
The outdoor unit is covered in ice: is that normal?
Does AirGreen hold the required licences?
Is the estimate free?
No question matches. Write to us: we answer.
More jobs to see, near you
By town, by equipment or by region: browse more than 4,700 published projects.
Each dot: a town where AirGreen has published projects. The glowing dot: this job.
Every house has its constraints. We see them before we install.
The on-site estimate is free and the quote follows within 24 hours.
Text and photo: a real AirGreen Climatisation & Chauffage job. The diagrams are generic illustrations of the type of installation, not a survey of this job site. Sources of the added figures: airgreen.ca product pages (NEEP / AHRI performance), Hydro-Québec (Heat pumps page, LogisVert, read on 13 October 2026), Régie de l’énergie (rate D as of 1 April 2026).