Installation of a MIDEA28 24,000 BTU wall-mounted heat pump in Delson: high-performance mini-split air conditioner installed high up in a South Shore residence
AirGreen installs a MIDEA28 24,000 BTU wall-mounted heat pump in Delson: high-capacity mini-split air conditioner, high-mounted installation, lasting comfort, and meticulous HVAC installation.
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 MIDEA28 installation in Delson where every inch counted
In Delson, on the South Shore of Montreal, our AirGreen team installed a MIDEA28 24,000 BTU wall-mounted heat pump, an air conditioner – mini-split system designed to provide robust comfort in a residential space requiring significant capacity. The photo shows a Midea indoor unit installed very close to the ceiling, in a compact location where installation precision was essential. We can see the unit up close, with its flap open, its bright front panel, and its tight integration into the top of the wall.
This installation stands out for two important elements: the high capacity of the unit, namely 24,000 BTU, and the physical constraint of the indoor location. A wall-mounted model of this power is not chosen at random. It meets real needs: a larger air volume, open plan, large room, main area of a house, or a zone where the customer wants effective air conditioning and efficient heating with a single wall-mounted system.
At AirGreen, we know that a successful HVAC installation doesn't just depend on the choice of machine. It depends on the building analysis, unit positioning, quality of connection, drain management, visual finish, and complete commissioning. In this Delson residence, the objective was clear: install a wall-mounted heat pump capable of effectively treating a large space, while respecting the constraints of an already defined wall and a close ceiling.
A wall unit installed close to the ceiling: a discreet but important technical challenge
In the image, the indoor unit is positioned at an angle very close to the ceiling. This type of installation requires much more rigor than an installation on a completely clear wall. A wall-mounted heat pump must be able to draw air from above, process it through its internal exchanger, and then blow it into the room at an adequate angle. If the unit is too close to the ceiling or improperly leveled, this can affect performance, increase noise, reduce the blowing range, or complicate HVAC maintenance.
In this project, our team took care to validate several points before final installation:
- the clearance available above the unit;
- the solidity of the mounting wall;
- the horizontal alignment of the unit;
- access to filters;
- the orientation of the blowing flap;
- the trajectory of the refrigerant lines;
- condensate drainage;
- visual integration into an already furnished space.
The Midea unit visible in the photo has a sleek facade with discreet front lighting. This type of display is practical for the customer, as it allows them to quickly confirm the temperature or operating mode without having to search for the remote control. However, the unit maintains a sober appearance, which is important in a living room.
Why choose a MIDEA28 24,000 BTU for this Delson residence
The MIDEA28 24,000 BTU is a relevant solution when a customer wants to air condition and heat a space larger than a bedroom or a small enclosed room. Its 24,000 BTU capacity is generally suitable for a large open area, a ground floor, a family zone, or a space where the air volume is more demanding.
In Delson, as in many areas of the South Shore, houses often have varied configurations: open living rooms, connecting kitchens, landings, higher ceilings, extensions, large windows, or spaces that accumulate heat in summer. Under these conditions, an under-capacity unit could run for a long time without achieving the expected comfort. A properly sized system, on the other hand, allows for more efficient temperature stabilization.
The MIDEA28 range is appreciated for its balance between performance, accessibility, and reliability. For a 24,000 BTU wall-mounted model, the desired advantages include:
- excellent cooling capacity for periods of intense heat;
- effective heating during a large part of the Quebec winter;
- inverter technology allowing for more precise modulation;
- reduced on-off cycles compared to a less advanced unit;
- more stable comfort in large spaces;
- relatively discreet indoor operation depending on the selected speed;
- simple daily use.
For homeowners in Montreal, Laval, Longueuil, the North Shore, and the South Shore, this category of wall-mounted air conditioner with heating function often represents an excellent compromise between comfort, energy efficiency, and localized temperature control.
The difference between a 12,000 BTU installation and a 24,000 BTU installation
A 24,000 BTU wall-mounted unit is not simply a larger version of a small mini-split. Its installation requires more thorough consideration, as it handles a larger air volume and its impact on air circulation is more pronounced. The airflow is more significant, the range is greater, and the positioning must be chosen carefully to avoid discomfort.
In a small enclosed room, a 24,000 BTU unit would generally be too powerful. It could cool too quickly without dehumidifying properly, create short cycles, and decrease comfort. In a suitable space, on the contrary, it allows for effective treatment of an area that would have been difficult to cover with a smaller unit.
For this installation in Delson, the choice of 24,000 BTU was consistent with the client's needs. The objective was not just to obtain occasional air conditioning, but a true comfort system for a main area. It is precisely in this type of context that AirGreen's analysis becomes important: we do not automatically recommend the highest capacity, we recommend the one that corresponds to the reality of the building.
A clean installation despite a tight space
The photo shows a unit installed very high, with noticeable proximity between the unit and the ceiling. The viewing angle also allows us to see the depth of the unit and its integration into the upper corner of the wall. This type of installation must be done carefully to avoid several possible problems:
Poor air intake
Air is drawn in through the upper part of the unit. Insufficient clearance can limit this intake and reduce efficiency. When a unit is installed high, technical requirements must be met while also considering aesthetics.
Difficult access to filters
Filters must be cleaned regularly. An installation that is too tight can discourage maintenance or make access unnecessarily complicated. At AirGreen, we always think about use after installation, not just the initial setup.
Inadequate drainage
An indoor unit produces condensate during air conditioning. The water must drain properly. A poorly leveled unit or an ill-planned drain can cause leaks, odors, or damage. In a high installation, level precision is essential.
Poorly oriented airflow
The flap must be able to direct the air without blowing directly on occupants uncomfortably. For a 24,000 BTU unit, airflow orientation is particularly important because the airthrow is greater.
The role of the mini-split in summer comfort in Delson
Summers on the South Shore can be hot and humid. In a house where air circulates poorly or where certain rooms accumulate heat, a well-installed wall-mounted air conditioner quickly changes daily comfort. Unlike portable units, a wall-mounted heat pump offers quieter operation, better efficiency, and more stable air distribution.
The MIDEA28 24,000 BTU installed in Delson allows the customer to cool a large area without having to use multiple temporary units. The comfort achieved is more uniform, especially when the unit is strategically placed to cover the main space.
Another important advantage is dehumidification. When a mini-split operates correctly, it helps reduce indoor humidity, which improves the feeling of coolness even when the displayed temperature is not excessively low. This often allows the air conditioning to be set at a reasonable temperature while achieving superior comfort.
Heating with a wall-mounted heat pump: a useful solution to reduce consumption
A modern heat pump can also contribute to heating, particularly during autumn, spring, and a large part of winter. For customers who use electric baseboard heaters, adding a powerful wall-mounted system can reduce consumption during cold periods, especially when the unit is used consistently and intelligently.
In Delson, the advantage of a model like the MIDEA28 24,000 BTU is its ability to provide more uniform heat in a main space. Forced-air heating can warm the ambient air more quickly than a baseboard heater in certain configurations. However, the flap must be properly oriented, as warm air naturally tends to rise. This is why ventilation and air direction settings are explained to the customer during commissioning.
Commissioning: an essential step after installation
Once the unit is installed, the work is not over. Commissioning confirms that everything is working correctly. At AirGreen, we check essential elements before leaving the premises:
- operation in cooling mode;
- operation in heating mode when conditions allow;
- remote control response;
- opening and closing of flaps;
- absence of abnormal noise;
- stability of the indoor unit;
- condensate drainage;
- airflow quality;
- customer's understanding of basic functions.
This step is particularly important with a 24,000 BTU unit, as the appliance's power must be well controlled. The customer must understand how to use the modes, ventilation, temperature, and flaps to achieve the best comfort without overconsuming.
AirGreen tips for a successful 24,000 BTU wall-mounted heat pump project
Do not choose capacity based solely on surface area
Surface area is a starting point, but it's not enough. A room with large windows, poor insulation, or a high ceiling may require a different capacity than a room of the same size but better insulated. Conversely, a very well-insulated house may require less capacity than one might think.
At AirGreen, we analyze several factors:
- solar orientation;
- ceiling height;
- number of windows;
- quality of insulation;
- room layout;
- presence of a staircase or open plan;
- customer habits;
- main objective: heating, cooling, or both.
Consider aesthetics from the start
A wall-mounted unit becomes a visible element of the home. In this installation in Delson, the unit is placed high, in an area that needed to remain visually clean. A successful installation must be functional, but also well integrated.
We therefore pay particular attention to alignment, height, duct routing, choice of covers, outdoor unit positioning, and overall finish.
Plan for HVAC maintenance
Good HVAC maintenance prolongs the life of the unit and maintains its efficiency. For a wall unit, the basic steps are simple but essential:
- clean filters regularly;
- keep the indoor unit clear;
- avoid blocking airflow;
- monitor for unusual noises;
- have the unit inspected periodically;
- keep the outdoor unit free of leaves, excessive snow, or debris.
A 24,000 BTU unit can operate for long hours during periods of high demand. Adequate maintenance therefore directly contributes to performance.
Check available grants
Financial assistance programs for wall-mounted heat pumps can vary depending on the models, certifications, and current criteria. Customers in Delson, Montreal, Longueuil, the North Shore, and the South Shore often ask us about eligibility for grants.
For a model like the MIDEA28 24,000 BTU, it is important to confirm the exact information of the installed combination, certification numbers, and program conditions at the time of application. AirGreen assists its customers by providing the necessary documents, including the invoice and installation details, to facilitate the process when the model is eligible.
An installation that reflects the AirGreen approach
This installation of a MIDEA28 24,000 BTU wall-mounted heat pump in Delson perfectly illustrates our working method: analyze before installing, choose the right capacity, respect site constraints, ensure a meticulous finish, and clearly explain the operation to the customer.
Our experience in the greater Montreal area allows us to work in a wide variety of contexts: single-family homes, condos, plexes, businesses, large living rooms, finished basements, open spaces, and buildings with specific constraints. Whether the project is located in Montreal, Laval, Longueuil, on the North Shore, or on the South Shore, our priority remains the same: to deliver a durable, clean HVAC installation tailored to the real need.
In Delson, the end result is a precisely installed wall unit, capable of providing significant comfort in a demanding residential space. The MIDEA28 24,000 BTU gives the client an efficient solution for summer air conditioning and supplemental or primary heating depending on conditions, while maintaining a sleek appearance indoors.
A well-installed heat pump transforms the daily experience of a home. It improves temperature stability, reduces discomfort during heatwaves, helps better manage humidity, and can contribute to lower heating costs. But to achieve these results, the quality of the installation is as important as the quality of the appliance. This is precisely where AirGreen adds value: concrete expertise, rigorous execution, and constant attention to the details that truly matter.
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?
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?
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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).