Four-season comfort, without compromise: an optimized HVAC installation in a Rosemont plex, designed for the Montreal climate and compact spaces.
Why this installation makes a difference for Montreal housing
The customer context
In a bright apartment in Rosemont–La Petite-Patrie, the demand is clear: efficient heating in winter while cooling in summer , with a discreet and quiet unit. The constraints of a plex: load-bearing walls, molded ceilings, restricted volumes around the cornices, wall penetration limited by the building's configuration.
The chosen equipment: Midea28 (R-454B, very cold)
We are choosing the Midea28 wall-mounted heat pump , a recent range that uses R-454B refrigerant and is designed to maintain its performance down to -30°C . Several power outputs are available (9,000 to 33,000 BTU), which allows the sizing to be adjusted to the actual load of the home. The interior unit, with its sleek white design, blends naturally into the decor and its operation remains quiet, ideal for living rooms.
What this means for the customer
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Stable comfort in heating and air conditioning, with a uniform air flow thanks to the motorized shutter.
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Low consumption linked to the inverter and new generation fluid.
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Eligibility for grant programs in effect in Quebec when the efficiency criteria are met (useful for Montreal, Laval , Longueuil , North Shore and South Shore ).
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Easy maintenance , easily accessible and washable filters.
AirGreen installation guide: method, finishes and usage tips
Precise placement under the cornice
The indoor unit is positioned at the top , under a molded cornice. We ensure the clearances prescribed by the manufacturer to preserve the air intake and avoid any hot recirculation. The wall support is laser-calibrated to obtain a neat slope towards the condensate evacuation point.
Short and clean refrigeration route
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Single hole on right side of unit, softened angle to protect insulation.
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Refrigerant connections and communication cable covered in white , to blend into the wall.
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Gravity drainage (no pump required), which reduces noise , maintenance risks and electricity consumption.
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Drilling seal treated with silicone and air barrier foam to eliminate any air or moisture infiltration.
Air quality and silence
The Midea28 incorporates progressive ventilation that limits temperature fluctuations. The airflow is directed to sweep the room without direct airflow toward sleeping areas. Interior noise levels remain very low, an advantage in open-plan apartments.
Responsible sizing
Our technical advisors perform load calculations based on the actual surface area, losses (walls, glazing, infiltration), and orientation. A 9,000 or 12,000 BTU is often sufficient for a well-insulated, medium-sized open space; additional rooms or a large living area may require more. This precise sizing prevents short-cycling, limits consumption, and extends the compressor's lifespan.
Measurable result
After commissioning:
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Refrigeration overpressure and overheating checked according to Midea28 range specifications.
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Nitrogen leak check, deep vacuum , then weighing of the charger when required.
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Hot/cold functional test , verification of drain slopes and flow.
Finishing details that matter
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Flush-fitting cladding matching the wall for an impeccable aesthetic signature.
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Radius of curvature of the connections respected in order to avoid pressure losses.
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Anti-vibration mountings on the support, for longevity and silence .
Tips for using smart comfort
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When heating, maintain a stable setting ; the inverter will do the rest and avoid overconsumption.
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Clean filters every 4 to 8 weeks depending on occupancy. A clean filter = optimal airflow and performance .
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In summer, use Dehumidification mode on humid days; the feeling of comfort increases even with a slightly higher setting.
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Schedule an annual HVAC maintenance : refrigerant check, ventilation, electrical balances, gentle battery cleaning. This guarantees long-lasting performance .
Points of attention in Montreal plexes
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Party walls and the presence of structural elements sometimes require a very compact lateral layout : we adapt the position of the head to optimize air intake , even near a cornice.
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Drain management : whenever a natural slope is possible, choose gravity for maximum reliability. We only install a condensate pump when the configuration requires it.
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Through opening : always insulated and air barrier reconstituted to prevent thermal bridges and humidity.
Grants and regional scope
In Greater Montreal, several provincial and utility programs encourage energy efficiency . Recent ranges such as Midea28 (R-454B) are generally eligible when efficiency and cold weather performance thresholds are met. Our team assists with the preparation of files and operates in Montreal , Laval , Longueuil , as well as on the North Shore and the South Shore .
Why AirGreen for your HVAC system?
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Precise diagnosis and recommendations adapted to the building envelope.
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Certified installation teams , rigorous commissioning procedures.
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Responsive after-sales service : maintenance, troubleshooting, original parts.
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Transparency on power selection, operating costs and schedules.
Quick FAQ
Which power should I choose?
We determine it from a thermal balance . Too powerful = discomfort and short cycles; too weak = underheating and premature wear.
What if I want to expand to other rooms?
The Midea28 can be integrated into multi-zone solutions with multiple heads if the project requires it. We then size the outdoor condenser accordingly.
Is it noisy?
The noise levels of the indoor unit are low; outdoors, we choose the location and anti-vibration supports to preserve peace and quiet.
Conclusion
This Midea28 wall-mounted heat pump installation in Rosemont–La Petite-Patrie exemplifies the AirGreen philosophy: precise engineering , meticulous finishing , and comprehensive support . The result: stable comfort , energy savings , and discreet integration, perfectly suited to Montreal plexes and condos.