Installation of a MIDEA28 24,000 BTU Wall-Mounted Heat Pump - Air Conditioner - Mini Split in Châteauguay, on the South Shore
In Châteauguay, AirGreen installed a MIDEA28 24,000 BTU wall-mounted heat pump with performance verification at the air outlet, confirming an efficient, clean, and well-calibrated HVAC installation.
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 MIDEA28 24,000 BTU Installation Validated On-Site with Performance Measurements
In Châteauguay, on the South Shore, AirGreen completed the installation of a MIDEA28 24,000 BTU wall-mounted heat pump, a mini-split system designed to meet the needs of a residential space requiring a higher capacity than a standard wall unit. This project stands out due to a detail highly indicative of our work method: the photo shows a temperature test performed directly at the air outlet of the indoor unit, using a digital thermometer.
This seemingly simple action summarizes an essential part of a successful HVAC installation. Installing a heat pump is not just about mounting an indoor unit on the wall and connecting the outdoor unit. It is necessary to verify that the system actually performs as expected, that the air is well distributed, that the efficiency is consistent, that the drainage is adequate, and that the unit responds correctly to commands. In this specific case, the measurement visible on the control device confirms that our team conducted a concrete validation of the operation after installation.
The MIDEA28 24,000 BTU was particularly suitable for this project because the client wanted to improve the comfort of a large indoor area. A 24,000 BTU capacity requires rigorous planning: the choice of location, air flow orientation, length of refrigerant lines, outdoor unit placement, and commissioning must be perfectly coordinated. A unit of this capacity can offer excellent comfort when properly installed, but it can also create discomfort if poorly positioned or calibrated.
At AirGreen, we attach great importance to this validation step. In projects carried out in Montreal, Laval, Longueuil, on the North Shore and South Shore, we know that clients seek a reliable result, not just a visually completed installation. This project in Châteauguay precisely illustrates this approach: a wall-mounted system cleanly installed, then tested to confirm performance quality.
Why choose a MIDEA28 24,000 BTU for a residence in Châteauguay
The MIDEA28 24,000 BTU is a relevant choice when a house has a significant open-concept area, a spacious main floor, a living room combined with a dining room, a space with higher ceilings, or an area exposed to the sun for a good part of the day. In Châteauguay, several residences have configurations where a small 9,000 or 12,000 BTU unit is often insufficient to stabilize comfort over a large area.
A 24,000 BTU wall-mounted heat pump can treat a larger area, provided that air can circulate correctly. Performance does not depend solely on nominal capacity. It also depends on room configuration, insulation, ceiling height, number of windows, building orientation, and the indoor unit's placement.
A cooling solution for large open areas
In cooling mode, the MIDEA28 acts as a wall-mounted air conditioner capable of quickly cooling a larger residential area. On hot and humid days on the South Shore, comfort largely depends on the unit's ability to lower the temperature while helping to control indoor humidity.
A properly sized wall-mounted system provides more stable comfort than a portable solution or a window unit. It is quieter, more efficient, and much better integrated into the home. For a client in Châteauguay who wants consistent comfort without installing ducts, the mini-split represents a logical and durable solution.
Efficient supplementary heating for transitional seasons
The wall-mounted heat pump is not only used for cooling. It can also contribute to heating, especially in spring, autumn, and during certain winter periods when the outdoor temperature allows for interesting performance. This versatility is a major advantage in the Quebec climate.
For many homeowners, the interest is to reduce the use of primary heating during transitional periods. Instead of heating the entire house with a central system, the MIDEA28 24,000 BTU allows for targeting the occupied zone and quickly achieving pleasant comfort.
A capacity that requires thoughtful placement
A 24,000 BTU unit has greater ventilation power and air throw than a smaller capacity unit. It should not be installed randomly. Poor placement can create a direct draft towards occupants, uneven temperature, or a perception of higher noise.
In this project, our team took care to position the indoor unit to optimize air distribution. The photo shows the unit installed near the ceiling, with the louver open during commissioning. The temperature test performed at the air outlet confirms that the unit produces the expected effect and that the system responds correctly.
Visible specificities of this installation
An air outlet temperature test
The most distinctive element of this installation is the temperature measurement performed directly at the outlet of the indoor unit. This control allows verification of the difference between the air drawn in by the unit and the air blown into the room. This difference provides a useful indication of the system's performance in cooling or heating mode, depending on the mode tested.
For a client, this type of verification provides peace of mind. It's not just about feeling that the air seems cold or hot. We confirm the operation with a concrete measurement. This step is part of serious commissioning, especially for a high-capacity system like a 24,000 BTU wall-mounted heat pump.
Indoor unit installed high on the wall
The wall unit is positioned near the ceiling, which is common for mini-split systems. This height allows for better air diffusion in the room and limits visual obstruction. However, it is necessary to respect the required clearances around the unit to ensure good air intake.
An installation too close to the ceiling could hinder operation. An installation too low could compromise aesthetics or create less efficient diffusion. In this project in Châteauguay, the unit is installed to maintain a good balance between performance and visual integration.
Commissioning performed methodically
Commissioning includes several checks: indoor unit operation, remote control or control response, ventilation, discharge temperature, condensation drainage, outdoor unit behavior, and absence of abnormal noises. The test visible in the photo is a concrete example of this rigor.
At AirGreen, we consider this step essential. An installation may appear complete visually, but only thorough commissioning can confirm that the system is functioning correctly. This is even more important for a MIDEA28 24,000 BTU, as the expected performance is high.
Clean interior finish
Even though the photo is taken close up, it is clear that the indoor unit is installed in a clean corner, with clear surfaces and a discreet finish. In residences in Châteauguay, as elsewhere on the South Shore, clients often want an effective solution that doesn't alter the appearance of their space. A wall-mounted air conditioner must integrate naturally, without unnecessary visible cables, without traces around the unit, and without giving the impression of improvised work.
Technical steps of HVAC installation
Analysis of the area to be cooled and heated
Before recommending a MIDEA28 24,000 BTU, we evaluated the area to be treated. The capacity of a wall-mounted system should never be chosen solely based on a quick estimate. Several elements must be analyzed:
- the area's surface;
- solar orientation;
- ceiling height;
- insulation level;
- number of windows;
- natural air circulation;
- occupancy habits;
- cooling and heating needs.
This analysis helps avoid two common errors: installing a unit that is too weak or too strong for the actual configuration. In this project, the 24,000 BTU capacity met the client's needs and the target space.
Choice of indoor location
The positioning of the indoor unit directly influences comfort. Our team chose a location that allows for effective air diffusion while maintaining practical access to the filters for HVAC maintenance. The unit had to be high enough to distribute air well, but accessible enough for regular cleaning operations.
Good placement also reduces the risk of uncomfortable zones. Air should not be blown directly into a resting area or workspace for long periods. The goal is to create a stable indoor climate, not a localized draft.
Refrigerant connections and drainage
Like any wall-mounted heat pump, the MIDEA28 requires precise refrigerant connections between the indoor and outdoor units. These connections must be made carefully to maintain circuit integrity and unit performance. Poor practice at this stage can lead to performance loss, service calls, or reduced lifespan.
Condensation drainage is also essential. In cooling mode, the indoor unit removes humidity from the air and produces condensate. This water must be properly evacuated, with an adequate slope and a reliable path. Poorly planned drainage can cause leaks, odors, or humidity problems.
Outdoor unit installation
Although the image shows the indoor unit, the outdoor unit plays a central role in overall performance. In Châteauguay, winter conditions necessitate thoughtful installation: clearance from snow, stable support, access for maintenance, and air circulation around the unit. The outdoor unit must be installed to operate efficiently in summer as well as in colder periods.
On the South Shore, we pay particular attention to snow accumulation, meltwater, winds, and sometimes restricted outdoor spaces. Good outdoor installation protects the client's investment and reduces the risk of seasonal problems.
Final tests and client explanations
Once connections are complete, our team proceeds with testing. The thermometer visible in the photo is part of this logic. We verify that the discharged air reaches a consistent temperature, that the modes work, that the system responds well to settings, and that the installation is ready for daily use.
We also explain good practices to the client: filter cleaning, mode selection, temperature setting, use of the diffusion vane, and the importance of periodic maintenance. A well-used heat pump consumes less, operates more quietly, and lasts longer.
Concrete benefits for the client in Châteauguay
Faster comfort in a large room
With a 24,000 BTU capacity, the MIDEA28 can bring about a rapid change in a significant living area. The client benefits from efficient cooling in summer and practical heating during cooler periods. This speed is particularly appreciated in homes where the main area accumulates heat during the day.
Better humidity control
Comfort is not limited to the temperature displayed on the thermostat. Indoor humidity plays a major role in the feeling of coolness. In cooling mode, a properly installed wall-mounted air conditioner helps remove some of this humidity, making the air more pleasant and comfortable.
In Châteauguay, as in Montreal, Laval, Longueuil, on the North Shore and South Shore, humid days can make a house feel heavy and uncomfortable even when the temperature is not extreme. A good HVAC solution significantly improves this feeling.
Ductless installation
The mini-split system allows for the addition of a cooling and heating solution without installing a complete duct network. For existing homes, this is often a major advantage. Work is more targeted, the impact on the building is more limited, and commissioning can be done quickly when planning is adequate.
A solution adapted to actual use
Each client uses their home differently. Some want to cool mainly the living room, others want to improve the comfort of an entire floor or a multi-functional space. A 24,000 BTU wall-mounted heat pump can meet several scenarios, provided the configuration is suitable.
In this project, the chosen solution met a clear demand: to offer stronger, more stable, and more controllable comfort in a significant area of the residence.
Mistakes to avoid with a 24,000 BTU wall-mounted heat pump
Installing too large a unit without analyzing the house
Higher capacity is not automatically better. A unit that is too large can cycle too frequently, reduce dehumidification, and create a feeling of irregular comfort. The capacity should always be validated according to the building's actual needs.
Neglecting performance testing
Once the unit is installed, it must be tested. Temperature measurement, ventilation verification, and system behavior observation allow for quickly identifying a potential problem. Without this step, an installation may seem correct while not performing at its full potential.
Forgetting filter maintenance
The indoor unit's filters must be cleaned regularly. Dirty filters reduce airflow, increase the system's effort, and can negatively affect air quality. HVAC maintenance is simple but must be done consistently.
Blocking air circulation
An indoor unit must not be obstructed by furniture, curtains, or decorative items. The outdoor unit must not be surrounded by debris, snow, or objects stored too close. Air circulation is fundamental to the performance of a heat pump.
AirGreen, a professional approach for MIDEA installations in Châteauguay and Greater Montreal
This installation of a MIDEA28 24,000 BTU in Châteauguay demonstrates the importance of well-planned and well-verified work. The choice of model, indoor location, connections, commissioning, and temperature test form a whole. Each step influences the final result.
At AirGreen, we carry out installations of wall-mounted heat pumps, wall-mounted air conditioners, and mini-split systems throughout the greater Montreal area, including Laval, Longueuil, the North Shore, and the South Shore. Our approach is based on a concrete understanding of Quebec homes, seasonal comfort needs, and the specific technical requirements of each project.
In Châteauguay, this installation provided the client with a high-performance solution that was well-integrated and validated by on-site tests. The thermometer visible in the photo is not just an accessory: it represents the rigor we apply to commissioning. An HVAC system must be beautiful, clean, and well-installed, but above all, it must function correctly.
For homeowners considering a MIDEA28 24,000 BTU wall-mounted heat pump, this project demonstrates that a successful installation depends as much on the team's expertise as on the quality of the equipment. A good machine performs at its best when it is properly sized, positioned, connected, and verified. This method ensures reliable comfort, season after season.
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 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.
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.
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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).