Installation of a MIDEA28 24,000 BTU wall-mounted heat pump in Candiac on the South Shore of Montreal
In Candiac, AirGreen installs a MIDEA28 24,000 BTU wall-mounted heat pump: a high-performance mini-split system, ideal for large living areas and lasting comfort.
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 Strategic Indoor Installation to Replace an Old Wall-Mounted Setup and Provide Superior Comfort
In Candiac, on the South Shore, AirGreen installed a MIDEA28 24,000 BTU wall-mounted heat pump, a mini split system designed to offer air conditioning and heating capacity suitable for a residential space requiring higher performance than a simple low-power wall unit. This installation is notable for a particularly interesting context: the indoor unit was placed in an area where clear traces of an old installation or wall arrangement were visible, including an existing lower plate, wall marks, and a visible technical passage.
The photo shows a modern Midea indoor unit, installed high on the wall, near a room corner. The unit displays a set temperature on the front, with the louvers open, indicating functional operation. This configuration allows for efficient air projection into the room, while using a location already logical for air distribution. The main challenge was to integrate a 24,000 BTU unit into an existing indoor environment without creating a cluttered visual impression and without compromising air circulation.
In many homes in Candiac, especially in established residential areas, homeowners want to improve their comfort without completely redoing the interior finishes. It is precisely in this type of project that an experienced HVAC installation team makes a significant difference: it's not enough to simply replace one unit with another; it's necessary to analyze the wall, clearances, line trajectory, old opening, outdoor unit position, and the actual needs of the area to be treated.
At AirGreen, we approached this installation as a complete HVAC modernization project, with particular attention to performance, cleanliness of work, and the integration of the unit into a space already marked by a previous configuration.
Why the MIDEA28 24,000 BTU Was a Suitable Choice for This Candiac Residence
The MIDEA28 24,000 BTU is a wall-mounted heat pump designed to meet greater comfort needs. A 24,000 BTU capacity can be relevant for a large open-concept area, a main floor, a space with higher ceilings, a room heavily exposed to sunlight, or an area where several rooms naturally communicate with each other.
In Candiac, many residences have generous living areas, large windows, and open configurations between the living room, dining room, and kitchen. Under these conditions, an underpowered heat pump can run for a long time without achieving the desired comfort, especially during hot and humid summer days. Conversely, a properly sized unit allows for more effective temperature stabilization, while offering a better daily experience.
The MIDEA28 24,000 BTU thus met a specific need: to ensure sufficient air distribution for a more demanding area, while retaining the advantages of a mini split wall-mounted system:
- targeted installation without a duct network;
- silent indoor operation;
- precise temperature control;
- practical heating during intermediate seasons;
- efficient air conditioning during hot periods;
- discreet integration into a residential room;
- solution suitable for renovation or replacement.
The client's goal was not merely to add a wall-mounted air conditioner, but to benefit from a more versatile system capable of improving home comfort over multiple seasons.
An Installation in a Room Corner: Precision is Mandatory
The photo shows the indoor unit installed near a wall corner. This type of location can be very effective, provided the positioning is well thought out. A unit placed near a corner must be installed with sufficient clearance to ensure good air intake, facilitate maintenance, and avoid overly limited diffusion to a single area.
In this project in Candiac, we considered several elements:
- the distance between the unit and the ceiling;
- the proximity of the side wall;
- the louver's blowing angle;
- filter access;
- the position of the old opening or technical passage;
- the visual impact of the device;
- the unit's capacity to cover the target area.
The Midea unit was installed at a height that promotes good air distribution. The open louvers allow the airflow to be directed into the room, which is essential with a 24,000 BTU capacity. A unit of this power must be able to "breathe" correctly, without immediate obstruction in front of the air outlet.
The Visible Challenge: Dealing with Traces of an Old Installation
Below the unit, an older rectangular wall area is visible, with marks, holes, and an opening. This detail reveals a frequent aspect of replacement or modernization projects: the installation of a new heat pump sometimes has to contend with the building's history.
In a house, an old wall-mounted unit, an old conduit, a cable passage, or an old trim plate can leave traces. AirGreen's role is then to perform a clean, functional, and technically sound installation, while respecting the limitations of the existing setup. In some cases, the client chooses to have the wall finish redone after installation, especially when the priority is first to replace or improve the HVAC system.
This reality is important to explain to homeowners: a well-executed HVAC installation does not necessarily mask all traces of an old configuration if painting, plastering, or interior finishing work is required. However, it must always guarantee:
- solid unit mounting;
- safe connection;
- good condensate drainage;
- performance meeting expectations;
- adequate access for maintenance;
- complete commissioning.
In this project, the Midea unit is well positioned above the existing area, with a clean and modern wall presence. The system is functioning, the louvers are operational, and the installation allows the client to quickly regain improved indoor comfort.
A 24,000 BTU Capacity: When Sizing Becomes Crucial
A 24,000 BTU wall-mounted heat pump should never be chosen at random. This capacity can offer excellent performance in a large area, but it must match the actual volume to be treated. An oversized unit for a small space can cool too quickly without properly dehumidifying, while an undersized unit can run continuously and leave uncomfortable zones.
At AirGreen, we always assess the situation before recommending a capacity. For an installation in Candiac, on the South Shore, the most important factors are often:
- the area of the open space;
- ceiling height;
- the presence of large bay windows;
- the orientation of the house;
- the level of insulation;
- air circulation between rooms;
- the possible position of the indoor unit;
- the path to the outdoor unit;
- the client's expectations for heating and air conditioning.
The MIDEA28 24,000 BTU was selected because it could meet a greater demand for comfort while maintaining the flexibility of a wall-mounted system. For many homeowners, this capacity represents an attractive solution when a 12,000 or 18,000 BTU unit is not sufficient to cover the main area of the house.
An Effective Solution for Large Living Areas on the South Shore
Homes in Candiac, Brossard, Saint-Constant, La Prairie, Longueuil, and other areas of the South Shore often feature open spaces where heat circulates differently than in a small urban dwelling. An open-concept kitchen, a central stairwell, or large windows can alter air conditioning needs.
In this context, a well-positioned wall-mounted heat pump becomes a very effective solution. It allows for treating a central area of the house and improving comfort without installing a central ducted system. The mini split system remains a popular choice for homeowners who want to modernize their comfort while limiting the scope of work.
The MIDEA28 24,000 BTU installed here precisely meets this type of need: generous capacity, a discreet indoor unit, and simple daily use.
The Importance of Air Distribution with a High-Capacity Unit
The higher the capacity, the more important the positioning of the indoor unit. A 24,000 BTU heat pump must distribute air evenly to avoid two common problems: an area directly below the unit that is too cold and a distant part of the room that is still too warm.
The unit visible in the photo is installed high on the wall, with the louvers oriented towards the space to be treated. This type of configuration promotes better air projection. During commissioning, our technicians check the unit's behavior, available modes, louver reaction, and the sensation of comfort in the room.
We also explain to the client how to use the settings to avoid discomfort:
- avoid too low a temperature in air conditioning;
- use a stable setpoint;
- adjust the louvers to distribute air;
- clean filters regularly;
- let the unit modulate rather than constantly turning it on and off;
- avoid blocking the air outlet with furniture or curtains.
These simple tips can make a real difference in comfort and energy consumption.
An Installation Requiring Good Indoor and Outdoor Coordination
Even if the photo only shows the indoor unit, a wall-mounted heat pump installation always involves complete work between the interior and exterior. The indoor unit must be connected to an outdoor unit by refrigerant lines, a communication cable, appropriate electrical power, and a condensate drainage system.
In a replacement or modernization project, this coordination is even more important. It is sometimes necessary to adapt the existing route, check the condition of passages, correct a drain slope, reposition certain elements, or work with an already present opening.
Our technicians ensure that the installation complies with best practices:
- properly leveled mounting plate;
- unit securely fastened;
- well-planned wall penetration;
- properly insulated piping;
- effective drainage;
- compliant connections;
- adequate vacuuming;
- leak testing;
- full functional test.
A reliable HVAC installation relies on these invisible steps. The final appearance matters, but long-term performance mainly depends on the quality of the technical work.
MIDEA28: An Interesting Option for Residential Comfort
The MIDEA28 model installed in Candiac falls into a category of wall-mounted heat pumps appreciated for their good balance between performance, accessibility, and ease of use. For a homeowner looking for a cooling and heating solution without unnecessary complexity, this type of unit can be a very relevant choice.
A Midea wall-mounted system generally offers intuitive operation, a subtle indoor presence, and modulating capacity adapted to daily needs. The 24,000 BTU version can accommodate larger areas, while retaining the wall-mounted format suitable for many homes on the South Shore.
For AirGreen, the equipment is only one part of the solution. The final result also depends on the assessment, installation, adjustments, and explanations given to the client. This is why we approach each project as a combination of equipment, building, and lifestyle.
Subsidies and Eligibility: Carefully Check the Exact Model
Subsidy programs can be a significant advantage for some homeowners who install an eligible heat pump. However, eligibility depends on the specific model, certified performance, and criteria in effect at the time of installation. For a MIDEA28 24,000 BTU, it is therefore essential to verify the exact data associated with the installed combination.
At AirGreen, we assist our clients in this verification by providing the necessary information when the model is eligible: brand, model, capacity, invoice, and relevant documentation. Clients in Montreal, Laval, Longueuil, the North Shore, and the South Shore particularly appreciate this clarity, as the procedures can sometimes seem technical.
Our approach is to avoid vague promises. We prefer to validate the model and applicable criteria so that the client can make an informed decision.
What This Installation Reveals About Replacement Projects
The presence of wall marks under the unit is a useful reminder: HVAC projects do not always take place in new or perfectly prepared rooms. Very often, we intervene in already equipped homes, where the goal is to modernize comfort without redoing the entire room.
In these situations, two aspects need to be clearly distinguished:
The HVAC work
This includes the installation of the appliance, connections, commissioning, testing, and advice on use.
The interior finish
This may include painting, plastering, wall touch-ups, or replacing an old decorative plate. Depending on the project, this work can be done before or after installation.
This transparency helps the client plan correctly. In this case, the Midea unit was installed functionally and cleanly, while taking into account the existing space.
Mistakes to avoid with a 24,000 BTU wall-mounted heat pump
For homeowners considering a wall-mounted heat pump in Candiac or elsewhere on the South Shore, certain mistakes can be costly in the long run.
The first is choosing a large capacity just because it seems more reassuring. A 24,000 BTU unit must correspond to a real need. Too much capacity in too small an area can compromise comfort.
The second is neglecting the location. A wall unit placed too close to an obstacle, too low, or poorly oriented can reduce the efficiency of air distribution.
The third is minimizing the importance of drainage. Poor condensate drainage can lead to water problems, odors, or wall damage.
The fourth is entrusting the installation to someone who is not proficient in mini-split systems. Refrigerant handling, connections, and vacuuming require specialized skills.
The fifth is forgetting about maintenance. Even a high-performance unit will lose efficiency if the filters remain dirty or if the outdoor unit is obstructed.
HVAC Maintenance: Preserving Performance After Installation
Once the MIDEA28 24,000 BTU wall-mounted heat pump is installed, maintenance becomes essential to maintain performance. The customer must be able to easily access the indoor unit's filters. In this installation, the unit is sufficiently clear to allow the front panel to open and regular cleaning.
We particularly recommend:
- cleaning indoor filters according to usage frequency;
- keeping the air outlet clear;
- avoiding unnecessary extreme settings;
- monitoring for any unusual noises;
- having the system checked if performance declines;
- keeping the outdoor unit clear in all seasons;
- scheduling periodic professional maintenance.
Good HVAC maintenance extends equipment life and ensures better indoor air quality.
A client experience focused on the final result
The client was looking for a solution that could significantly improve indoor comfort without replacing the entire house infrastructure. The choice of a MIDEA28 24,000 BTU wall-mounted heat pump met this expectation. After installation, the unit allows for more precise temperature control and better comfort management in the targeted area.
Our team took the time to explain the operation, basic settings, filter maintenance, and good usage practices. This step is important, as a well-used system yields better results. A heat pump is not just a device that is turned on as needed; it works best when it maintains a stable temperature and modulates according to demand.
AirGreen in Candiac, Montreal, Laval, Longueuil, North Shore, and South Shore
AirGreen regularly operates in Candiac and throughout the South Shore, as well as in Montreal, Laval, Longueuil, and on the North Shore. Our field experience allows us to adapt to very different contexts: single-family homes, condos, duplexes, triplexes, extensions, renovations, and replacements of old systems.
This installation in Candiac clearly illustrates our ability to work in an existing space, with visible constraints, while delivering a reliable and adapted HVAC solution. We know that every home has its history, its peculiarities, and its limitations. That's why we favor a personalized approach, based on observation, precision, and quality of execution.
A Midea installation designed to last
The MIDEA28 24,000 BTU installed here provides a concrete solution to a significant comfort need. The interior positioning, the chosen capacity, and the commissioning allow the client to enjoy a modern, efficient, and easy-to-use system.
This project also shows that a successful installation doesn't just depend on its immediate appearance. It depends on how the appliance is secured, connected, tested, and explained to the client. It also depends on the ability to work with existing conditions, such as the visible wall area under the unit, without compromising the system's performance.
At AirGreen, we pay this attention to detail in every HVAC installation, whether it's a replacement, a first installation, or a more complex project. In Candiac, this Midea wall-mounted heat pump now represents a sustainable comfort solution, adapted to the reality of the home and the client's expectations.
How it goes, from the first call to the end
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 the unit delivers when it is cold
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 28 9 000 | 12,000 | 11,500 | −30 °C: 5,100 | 1.8 | 27.4 | 12.5 | – |
| Midea Série 28 12 000 | 12,000 | 11,500 | −30 °C: 5,900 | 1.8 | 25.4 | 10.5 | $1,440 |
| Midea Série 28 18 000 | 18,000 | 18,000 | −30 °C: 8,000 | 1.92 | 21.4 | 11.0 | $2,160 |
| Midea Série 28 24 000 | 22,200 | 24,200 | −30 °C: 11,900 | 2.34 | 21.0 | 13.5 | $2,664 |
| Midea Série 28 33 000 | 32,000 | 35,000 | −30 °C: 20,700 | 1.98 | 19.5 | 10.5 | $3,840 |
According to NEEP, it delivers 12,000 BTU/h at −8 °C (17 °F), as much as at 8 °C. It heats as hard in moderate cold as in mild weather.
At 8 °C, its certified maximum capacity reaches 16,000 BTU/h, 78% more than its nominal 9,000 BTU size.
According to NEEP, its certified heating capacity at −15 °C (5 °F) is 11,500 BTU/h, 128% of its nominal 9,000 BTU size. Its COP there is 1.80.
According to NEEP, it delivers 12,000 BTU/h at −8 °C (17 °F), as much as at 8 °C. It heats as hard in moderate cold as in mild weather.
At 8 °C, its certified maximum capacity reaches 16,000 BTU/h, 33% more than its nominal 12,000 BTU size.
At −30 °C, its certified minimum capacity is 2,000 BTU/h (3,800 at 8 °C). It slows down instead of cycling on and off.
According to NEEP, it delivers 18,000 BTU/h at −8 °C (17 °F), as much as at 8 °C. It heats as hard in moderate cold as in mild weather.
According to NEEP, its certified heating capacity at −15 °C (5 °F) is 18,000 BTU/h, 100% of its nominal 18,000 BTU size. Its COP there is 1.92.
According to NEEP, its COP at −15 °C is 2.34: the highest of the Série 28 line, which ranges from 1.80 to 1.98 at that temperature.
At −30 °C, its certified minimum capacity is 2,400 BTU/h (11,800 at 8 °C). It slows down instead of cycling on and off.
According to NEEP, its certified heating capacity at −15 °C (5 °F) is 24,200 BTU/h, 101% of its nominal 24,000 BTU size. Its COP there is 2.34.
According to NEEP, its certified maximum capacity at −30 °C (−22 °F) is 20,700 BTU/h, 63% of its nominal 33,000 BTU size.
At −30 °C, its certified minimum capacity is 4,200 BTU/h (19,700 at 8 °C). It slows down instead of cycling on and off.
According to NEEP, its certified heating capacity at −15 °C (5 °F) is 35,000 BTU/h, 106% of its nominal 33,000 BTU size. Its COP there is 1.98.
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.
And 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.
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.
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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?
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How cold can it heat?
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The outdoor unit is covered in ice: is that normal?
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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).