Installation of a Midea28 wall-mounted heat pump in Chomedey (Laval)
Construction site in Chomedey: HVAC installation of a Midea28 wall-mounted heat pump (R-454B, −30 °C) on a brick facade, anti-vibration brackets, discreet capping and a dedicated 240 V circuit. AirGreen: HVAC expertise in Greater Montreal.
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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 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 article, chapter by chapter
The comfort of a third-floor apartment requires impeccable HVAC installation . Here, we're installing a Midea28 wall-mounted heat pump (R-454B, −30°C) on the brick facade of a residential building in Chomedey, coordinating motorized access, structural anchors, and finishes specific to a condominium.
A high-rise construction site, mastered from the first attempt
Access to the façade is via a spider lift, allowing work to be carried out at a height of nearly 10 m above the ground, without disturbing the parking lot or tenants. Our team secures the perimeter, anchors the walls in the brick with chemical resin, and installs galvanized wall brackets with anti-vibration pads to protect the masonry and reduce noise transmission.
What we install
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Midea28 R-454B outdoor unit (extreme cold −30°C ), quiet and designed for the climate of Greater Montreal .
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12,000 BTU indoor wall head suitable for an open living area of approximately 450–650 sq. ft.
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High density insulated 1/4–3/8 copper refrigerant lines, effective length ~7–9 m due to height and discreet routing.
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Brown-beige formwork (capping) to blend the connections into the wood/brick relief.
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Gravity drain with weather stripping; no condensate pump required thanks to the height and direct outlet to the outside.
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External disconnect switch and dedicated 240 V circuit (15 A) protected at the panel, in accordance with the Quebec Electrical Code.
Why the Midea28 for Laval
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New generation R-454B refrigerant, reducing the environmental footprint.
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High seasonal efficiency and stable performance in extreme cold, ideal for Laval , Montreal , Longueuil , North Shore and South Shore .
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Optimized defrosting, useful when the unit is installed high up, sheltered from snow banks, but exposed to the wind.
Key steps of our AirGreen method
1) Survey and passage plan
Identification of partitions, location of studs, electrical outlets and clear paths to avoid water pipes and ventilation stacks. We validate the required clearances around the condenser (supply and return) and the point of drilling through the brick (controlled diameter, vapor barrier and sealing with polyurethane mastic).
2) Durable anchors and supports
The brackets are sized for load and wind resistance. Stainless steel anchors with sieve and resin; installation of an anti-vibration mat under the unit; minimum slope for frost dripping during defrost cycles.
3) Refrigeration connections and sealing
Controlled bending, nitrogen brazing, nitrogen testing then deep vacuum (< 500 microns) with strength test. Continuous insulation, butyl tape in the capping to prevent water and air ingress.
4) Power supply and protections
Install a disconnect switch within easy reach, UV-rated outdoor cable, waterproof cable glands. At the panel: double-pole circuit breaker, circuit identification and voltage drop measurement.
5) Commissioning and fine adjustments
After opening the valves, we check superheat/subcooling, sensors, dampers, and airflow. We calibrate the setpoint to limit short cycles, explain filter maintenance, and schedule annual HVAC maintenance (exchanger cleaning, insulation testing, condensate check).
Site constraints and solutions provided
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Height and safety : marked perimeter, basket stabilized on four supports, weather checked to avoid gusts.
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Mixed brick/wood facade : choice of matching capping and a compact path for a discreet finish.
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Occupied building : drilling at agreed times, HEPA vacuum cleaners to limit dust and sound level meter to check the night-time impact on adjacent dwellings.
Result for the customer
The living space quickly reaches the setpoint, with a contained noise level both inside and outside. For heating, the Midea28 easily covers the mid-season and withstands winter cold, while reducing the energy bill compared to electric baseboard heaters. The installation respects the clearances, masonry, and aesthetics of the condominium.
AirGreen Expert Advice for Brick Buildings
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Favor structural anchors with resin and screen in the joints, never on fragile or crumbling brick.
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Plan the angle of the drain when tracing to maintain gravity; a pump is a last resort on the facade.
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Limit the length of lines : the shorter it is, the more stable the yield; group the drilling, head and condenser on the same axis.
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Anticipate future access : clearances for maintenance, capping path not obstructed by gutters or cables.
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Plan the power supply : dedicated circuit to the panel, clear marking and disconnector accessible to the technician.
Maintenance and warranties
Annual HVAC maintenance extends the lifespan: chemical cleaning of the evaporator, checking fans, tightening connections, inspecting supports and sealing. Manufacturer warranties apply in full when maintenance is documented and the installation complies with industry standards.
And what about subsidies?
Depending on the programs in effect, a high-efficiency heat pump installed by a licensed contractor may be eligible for financial assistance. We guide our clients in Greater Montreal (Montreal, Laval , Longueuil , North Shore , South Shore ) to prepare files and maximize savings.
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).