Installation of a Midea28 (R-454B) wall-mounted heat pump in Chomedey, Laval
HVAC installation of a Midea28 wall-mounted heat pump (R-454B) on a balcony in Chomedey, Laval: raised aluminum support, waterproof disconnect switch, protected connections and four-season comfort, in compliance with co-ownership requirements.
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.
Four-season comfort for a condo with a balcony: careful installation on raised support, controlled silence and optimized performance in extreme cold.
Project context: a condo in Chomedey with a sheltered balcony
At AirGreen , we are working on a recent condo in Chomedey (Laval) , with a concrete balcony, metal railings and limited lateral clearances. The client's objective is clear: efficient heating in winter, cooling in summer, discreet acoustic level and HVAC installation compliant with co-ownership rules. We selected a Midea28 wall-mounted heat pump with R-454B refrigerant , a recent, efficient solution adapted to the climate of Greater Montreal.
Why Midea28 (R-454B) for this type of housing
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R-454B : new generation fluid with lower GWP than R-410A, meeting current transition requirements.
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Reliable heating down to approximately −30°C (XLTH range), suitable for cold peaks in Laval.
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Wide modulation inverter to smooth consumption and maintain a stable temperature .
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Careful acoustics of the outdoor unit, a key criterion in co-ownership.
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Wi-Fi control : scenarios for lowering the setpoint during the day and resuming it before arrival.
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Compatibility with energy efficiency programs when performance indices are met and installation is carried out by qualified contractors .
Site study: constraints and choice of location
Outdoor installation. The condensing unit is placed on the balcony , under an upper slab which protects from snow and driving rain. This position:
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respect the distance from the guardrail to ensure air suction;
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limits visibility from the street and reduces exposure to wind ;
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facilitates HVAC maintenance and service interventions.
Technical clearances. We comply with the manufacturer's prescribed side and top clearances to prevent the recycling of hot air for heating and ensure optimal defrosting .
Electricity. A waterproof external disconnect switch is installed nearby, on a rigid support, for safety and compliance. The power cable follows a protected route, with service loops and stainless steel anchor points.
Support and anti-vibration: stability and longevity
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Raised aluminum support (modular crosspieces) anchored to the concrete balcony, with anti-vibration feet .
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Height calculated to maintain ground clearance , facilitate the evacuation of defrosting condensate and prevent water accumulation.
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Controlled torque tightening to limit vibration transmission to the balcony structure and surrounding area.
Refrigeration connections and sealing
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Insulated closed-cell copper connections , optimized routing along the side post then towards the technical wall.
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UV protection of stainless steel insulators and collars ; contact points avoided to eliminate the risk of abrasion .
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Estimated total length between 5 and 8 meters , controlled adaptation to manufacturer preloads.
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Brazing under nitrogen , pressure test (dry nitrogen), deep vacuum then release of the fluid; protocol documented in our commissioning sheet.
Condensate and defrost management
Although the main condensate comes from the indoor head in air conditioning mode (managed by gravity to the outside), the outdoor unit produces water during winter defrosting . The raised support, the orientation and the slight slope of the balcony allow easy drainage, without stagnation under the unit.
Interior: wall-mounted headboard, comfort and discretion
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Interior head positioned high up in the living area, away from parking areas (sofa, TV corner) to avoid direct airflow .
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Automatic sweeping : even distribution of air and reduction of temperature gradients between rooms.
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Easily accessible filters for quick maintenance by the occupant.
Installation process (AirGreen method)
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Protection of common areas and balconies (tarpaulins, wall corners, elevators if applicable).
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Tracing of drillings and verification of networks (electricity, structure).
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Clean drilling with dust collection and vapor barrier at the wall passage.
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Installation of the aluminum support, leveling, anchors suitable for concrete, anti-vibration pads.
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Passage and connection of lines, nitrogen brazing , pressure and vacuum tests.
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Opening of valves , powering up, functional tests (Delta T, intensity, noise, forced defrosting if required).
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Wi-Fi setup and mobile app training.
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Handover of the premises and recording of the commissioning report.
Typical duration: half a day for a single-head with easy access to the balcony.
Actual performance and acoustic comfort in co-ownership
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In heating, the Midea28 maintains useful capacity in negative temperatures; compressor-fan modulation reduces sound peaks .
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In air conditioning, the Inverter algorithm limits ON/OFF cycles and promotes a low noise level on the balcony, which is appreciated by the neighbors.
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Factory skids and propeller tuning minimize harmonics; we validate the suction/discharge static pressure to avoid air recycling behind the guardrail.
Neat finish and co-ownership compliance
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Aligned paths , properly spaced collars, color consistent with the facade elements.
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Clear labeling : associated circuit breaker, nominal current, serial numbers.
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Compliance with noise, aesthetic and safety requirements imposed by the union (location, drilling, template).
Recommended HVAC maintenance
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Clean filters every 4–6 weeks during use.
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Annual inspection : heat exchange, electrical tightening, defrost flow, condition of UV insulation.
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Gentle washing of the condenser and disinfection of the evaporator to preserve air quality .
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Checking for application updates and rereading diagnostics (codes, history).
Regular HVAC maintenance stabilizes SEER/HSPF efficiencies and extends lifespan.
Technical highlights of this installation
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Type : single-zone wall-mounted heat pump ( heat pump = heating + air conditioning).
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Brand / Range : Midea28 (R-454B) .
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Installation : concrete balcony, raised aluminum support with anti-vibration .
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Power supply : dedicated circuit, waterproof disconnect switch nearby.
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Connections : UV insulated copper, ~ 5–8 m , N₂ brazing, high vacuum.
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Condensate : gravity drain from the head; external defrosting managed by riser and natural slope.
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Acoustics : co-ownership compliance, inverter cycle and mechanical separation.
Grants and Eligibility
In the Montreal, Laval, Longueuil, North Shore and South Shore regions , recent high-efficiency, new-generation fluid heat pumps may be eligible for incentives when official criteria (performance indices, minimum operating temperature, installation by accredited professionals) are met. We support our clients in verifying eligibility , preparing proof of commissioning and submitting applications.
Daily usage tips
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In severe winter, use Heat mode with Auto fan ; avoid excessively high settings which cause frequent defrosting.
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In summer, aim for a difference of 6–7°C with the outside, with the shutters sweeping to homogenize the air.
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Activate connected scenes : lowering by 1–2°C when away, restarting before returning.
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Keep the balcony grilles clear (no objects in front of the condenser).
Result
The condo benefits from stable comfort and a discreet installation that meets the constraints of co-ownership. The raised support , the waterproof disconnector and the protected routing of the connections ensure reliability and security . In Chomedey as elsewhere in Greater Montreal, our AirGreen approach combines precise sizing , clean execution and local service .
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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Every house has its constraints. We see them before we install.
The on-site estimate is free and the quote follows within 24 hours.
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).