Installation of a MIDEA35 18,000 BTU Wall-Mounted Heat Pump – Air Conditioner – Mini Split in Repentigny
AirGreen installs an 18,000 BTU MIDEA35 wall-mounted heat pump in Repentigny: efficient mini-split, precise interior finish, and lasting HVAC comfort.
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The job on one screen
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 compact indoor installation in Repentigny, designed for the real comfort of a Quebec home
In Repentigny, the needs for wall-mounted air conditioning and efficient supplementary heating are very concrete: heavy and humid summers, variable inter-seasons, large temperature fluctuations, and homes where some rooms quickly become less comfortable than others. For this project, our AirGreen team installed an MIDEA35 18,000 BTU wall-mounted heat pump, a mini-split system designed to provide stable comfort in a significant living area, while maintaining discreet indoor integration.
The photo of this installation shows the indoor unit placed near the ceiling, close to a decorative molding. This detail is important: in many Repentigny residences, the available space at the top of the walls can be limited by moldings, lower ceilings, interior partitions, or ducting constraints. Here, the installation was carried out with precision to respect the existing space, ensure good air distribution, and maintain a clean finish.
This project perfectly illustrates our approach at AirGreen: installing a high-performance heat pump, but above all, integrating it correctly into the reality of the building. A good machine only performs at its best if it is properly sized, well positioned, and installed using rigorous methods.
MIDEA35 18,000 BTU: a wall-mounted solution adapted to large living areas
Why an 18,000 BTU capacity in Repentigny?
An 18,000 BTU wall-mounted heat pump is often chosen when a client wants to treat a larger area than a simple bedroom or small office. In Repentigny, we regularly install this type of system in open living rooms, partially open-plan ground floors, good-sized condos, house extensions, or spaces where air circulation needs to cover several close-by areas.
The 18,000 BTU capacity can meet a higher demand for air conditioning during the summer, while providing a significant contribution to heating during colder periods. It is particularly suitable for homeowners who want to reduce temperature differences in a large central room or improve the comfort of a floor where the existing system is insufficient.
In this project, the choice of the MIDEA35 18,000 BTU was made because the client was looking for a wall-mounted solution capable of providing a quick response, but also stable operation. A unit that was too small would have worked too hard, for too long, with less satisfactory results. A unit that was too large could have caused short cycles and less effective dehumidification. Proper sizing was therefore at the heart of the project's success.
An indoor unit installed near the ceiling: precision and real constraints
The photo highlights a very common technical point: the indoor unit is installed very close to the ceiling and a molding. This type of situation requires careful reading of the manufacturer's recommended clearances, the wall structure, and the refrigerant line path.
A wall-mounted air conditioner must be positioned to allow good air intake from above and effective diffusion into the room. An installation too close to the ceiling can hinder air circulation. Conversely, an installation that is too low can affect aesthetics, obstruct wall use, or diffuse air less optimally. Our technicians therefore worked with precision to find the balance between performance, clearance, appearance, and architectural constraints.
The presence of the molding also added a visual constraint. In a residence where interior details matter, a misaligned installation is immediately noticeable. Here, the unit is neatly placed, with an orientation that respects the line of the ceiling and wall. Even in a tight space, the goal was to deliver a neat and professional finish.
An HVAC installation that requires more than just wall mounting
Installing a wall-mounted heat pump is not just about hanging a unit on the wall. Each step influences the comfort, durability, and efficiency of the system. For this installation in Repentigny, our team paid particular attention to several aspects:
- the mounting height of the indoor unit;
- the clearance around the appliance;
- alignment with existing moldings;
- the routing of pipes to the outside;
- condensation drainage;
- wall penetration sealing;
- refrigerant circuit vacuuming;
- operational tests for cooling and heating;
- a complete explanation of operation to the client.
These elements may seem technical, but they have a direct impact on the homeowner's experience. A poorly sloped pipe can create drainage problems. A poorly positioned unit can produce uncomfortable air diffusion. Neglected vacuuming can impair the reliability of the system. At AirGreen, every step is treated as an essential part of the final result.
The choice of the MIDEA35 model: efficiency, simplicity and daily comfort
The MIDEA35 range is appreciated for its balance of performance, accessibility, quiet operation, and versatility. For a homeowner looking for an efficient wall-mounted heat pump without transforming their home's interior, this type of appliance represents a very relevant solution.
The MIDEA35 18,000 BTU quickly cools a living area in summer, while providing useful heating when temperatures drop. Thanks to its modulating operation, the appliance adjusts its capacity according to actual demand. This modulation helps maintain a more constant temperature, without the abrupt variations sometimes seen with less suitable systems.
In a Repentigny home, where rooms can receive a lot of afternoon sun or retain humidity during hot periods, this stability is particularly appreciated. The client was not just looking for a device that could blow cold air; they wanted a lasting improvement in comfort.
A relevant solution for Repentigny and the northeast crown of Montreal
Repentigny presents varied residential realities: single-family homes, renovated bungalows, condos, townhouses, houses with extensions, finished basements, and open spaces created during renovations. These configurations often require a more detailed analysis than a simple quick calculation of area.
In many homes in the area, central air conditioning is not present or does not uniformly cover all zones. In other cases, the main heating system works well, but certain rooms remain uncomfortable. A mini-split wall-mounted heat pump can then target the problematic area without undertaking major ductwork.
Our experience in Repentigny, as well as in Montreal, Laval, Longueuil, on the North Shore and on the South Shore, allows us to adapt installations to the realities of each building. An installation in a condo in Laval is not planned like an installation in a brick house in Repentigny. An open ground floor in Longueuil does not have the same needs as a partitioned floor in Montreal. This field experience helps us recommend the right model, the right capacity, and the right location.
Challenges encountered on this project
The main challenge of this installation was the available space for the indoor unit. The proximity to the ceiling and the molding required precise installation. It was necessary to avoid a position that was too low, which would have negatively impacted aesthetics, while respecting the clearances required for the unit to function correctly.
The second challenge concerned the trajectory of the lines. In a wall-mounted installation, the refrigerant lines, communication cable, and drain must follow a logical and neat path. Drilling must be done with an adequate slope to facilitate condensation drainage. A poor slope can lead to water backflow or humidity problems. Our technicians therefore validated the path before installation to avoid any unnecessary corrections afterward.
The third challenge was the interior finish. With the unit installed in a visible space, appearance was as important as performance. The work was carried out in such a way as to preserve the cleanliness of the wall, avoid unnecessary marks, and ensure a harmonious result with the existing environment.
Mistakes to avoid before installing a wall-mounted heat pump
A successful installation begins even before the technicians arrive. Many homeowners compare prices and models but overlook essential points that can influence the final result. Here are the most common mistakes we see:
Choosing capacity based solely on area
Area is useful, but it's not enough. You also need to consider insulation, sun exposure, number of windows, ceiling height, room layout, and the actual use of the space. An 18,000 BTU heat pump may be ideal in a large open space, but excessive in a room that is too small.
Installing the indoor unit without analyzing air distribution
Air must circulate naturally in the area to be treated. If the unit blows directly onto a sofa, bed, or workstation, comfort can become unpleasant. If it is placed in a closed corner, the temperature can remain uneven. Positioning is therefore as important as choosing the model.
Underestimating the importance of drainage
In cooling mode, the indoor unit produces condensation. This water must be properly drained. A poor slope, a badly placed drain, or an improperly protected outlet can cause problems in the medium term. In our HVAC installations, drainage is always one of the essential control points.
Entrusting the installation to an unqualified person
Refrigeration work must be carried out by qualified professionals. Connecting the lines, vacuuming, leak checking, and commissioning are not minor details. An approximate installation can reduce the lifespan of the appliance and impair its performance.
Performance, comfort and daily use
Once installed, the MIDEA35 18,000 BTU offers the client an easy-to-use solution. The unit can be set according to the room's needs, with modes adapted for cooling, heating, ventilation, and dehumidification depending on the exact model's available functions.
To achieve optimal comfort, we generally recommend avoiding constant temperature changes. It is often more effective to choose a stable setting and let the heat pump modulate its operation. This approach reduces variations, improves comfort, and helps the unit work more efficiently.
In a large living area, it is also useful to keep interior doors open when the goal is to promote better air circulation. Conversely, if you want to concentrate comfort in a single area, you can limit openings to unused rooms.
HVAC Maintenance: Preserving MIDEA35 Performance
A well-installed wall-mounted heat pump also needs to be well maintained. The indoor unit filters must be cleaned regularly, especially during periods of intensive use. Dust, pet hair, cooking, and humidity can clog the filters and reduce airflow.
Good HVAC maintenance helps maintain:
- better air quality;
- more stable performance;
- quieter operation;
- better controlled energy consumption;
- longer equipment lifespan.
We also recommend monitoring the outdoor unit, especially after winter or strong winds. Leaves, snow, ice, or debris can hinder air circulation. A clear unit works better and exerts less strain.
Subsidies and eligibility: check the exact model
Subsidy programs can influence the purchase decision for a wall-mounted heat pump, but it is important to verify the eligibility of the exact model installed. For a MIDEA35 18,000 BTU, eligibility depends on the current criteria, specific model numbers, certified performance, and program requirements at the time of installation.
At AirGreen, we provide clients with the necessary information for their applications when the appliance is eligible: detailed invoice, model numbers, proof of installation, and relevant information. This rigor helps owners submit a clear and complete file.
In Repentigny, as elsewhere in Greater Montreal, many clients evaluate their project taking into account the net cost after potential subsidies. This is a good approach, provided that the appliance is not chosen solely based on the possible amount. Comfort, installation quality, and adaptation to the building remain the priorities.
An AirGreen experience focused on details
This project in Repentigny clearly demonstrates what we consider a successful installation: a well-sized unit, thoughtful placement, a clean finish, and complete commissioning. The client gets a system that meets their real needs, without excessive work and without compromising on interior aesthetics.
Our team takes the time to explain how the appliance works, best practices for use, and essential maintenance points. This step is important because an owner who understands their wall-mounted mini-split will get more out of their investment.
We carry out this type of project throughout the greater region: Montreal, Laval, Longueuil, North Shore, South Shore, and of course Repentigny. Each installation is different, but our method remains the same: precise analysis, honest recommendation, professional installation, and reliable follow-up.
A MIDEA35 18,000 BTU installed with precision for lasting comfort
The installation of this MIDEA35 18,000 BTU in Repentigny demonstrates that a high-performance wall-mounted heat pump must be accompanied by meticulous execution. The indoor position near the ceiling, the presence of moldings, the need for good clearance, and the desire for a discreet finish required precise work.
The result is a well-integrated wall-mounted air conditioning and auxiliary heating solution, suitable for a large living area and ready to improve daily comfort for the client. For homeowners considering an HVAC installation in Repentigny, Montreal, Laval, Longueuil, on the North Shore or on the South Shore, this project highlights one essential thing: the quality of the installation matters as much as the choice of the unit.
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).