Four-season comfort in a Montreal duplex: a neat, discreet installation ready for the cold
At AirGreen , we have just installed a Midea Midea28 wall-mounted heat pump in a typical duplex in Rosemont–La Petite-Patrie . The client's goal: to stabilize the temperature of the main rooms, reduce operating costs and benefit from quiet operation, summer and winter, without major work. Our mission: to offer a recent system using R-454B refrigerant , efficient down to -30 °C , and to integrate it neatly into the interior architecture while preparing for future maintenance.
Buildings and Needs: A Real Case of Greater Montreal
The property features warm-toned painted gypsum interior walls, standard ceilings of approximately 2.4 m, and an easily accessible courtyard side façade. The owner was looking for:
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Immediate comfort in the living area (living room/dining room) with well-distributed airflow;
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An energy-efficient system eligible for current grant programs;
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Discreet integration to preserve interior aesthetics.
We recommended the Midea28 (R-454B wall-mounted range) in single zone , a choice recognized for its reliable heating in the Montreal climate , its responsive inverter , and its excellent low-speed modulation for mid-seasons.
What was installed: technical description and finishes
Inner head positioning
The wall head is fixed at the top , centered on the load-bearing wall, in order to exploit the natural draft and avoid dead zones near the ceiling. This placement guarantees:
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Even diffusion thanks to the large motorized shutter;
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An accurate reading of the ambient temperature;
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Easy access for regular maintenance (filters, inspection).
Refrigeration path and condensate drainage
The connection bundle (refrigerant, power supply, drain) exits at the right end of the head and runs along the wall in an insulated flexible sheath . This configuration:
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Reduces drilling length;
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Protects pipe insulation from condensation;
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Allows gravity flow of condensate to the outside, eliminating the need for a pump and improving reliability.
Externally, the connection is made with brazing under nitrogen and a rigorous high vacuum < 500 microns, an essential prerequisite to preserve the oil, limit residual humidity and ensure the longevity of the inverter compressor.
Power supply and protections
We connected the unit to a dedicated circuit with a compliant circuit breaker, respecting the polarity, grounding, and maximum lengths prescribed by the manufacturer. An external service switch ensures a safe disconnection during maintenance work. The interconnecting wiring meets the required gauges, with crimped and tested ferrules.
Why the Midea28 for Rosemont–La Petite-Patrie
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R-454B refrigerant : lower GWP than R-410A, better seasonal efficiency and compatibility with current environmental requirements.
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Reliable heating down to −30°C : a concrete response to the frequent cold waves in Greater Montreal .
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Silence and modulation : the DC inverter compressor maintains the temperature smoothly, limits consumption peaks and improves acoustic comfort.
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Filtration and air quality : washable filters and easy access for routine HVAC maintenance .
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Remote control and smart modes : precise setpoint control, automatic sweeping, humidity management and anti-cold draft functions.
Grants and financial benefits
Recent wall-mounted heat pumps like the Midea28 are generally eligible for provincial and municipal financial assistance when efficiency criteria are met. We support our customers in Montreal, Laval, Longueuil, North Shore and South Shore in pre-qualification , collecting proof of installation and submitting files . The goal: to accelerate the return on investment and secure access to available amounts.
Construction progress: AirGreen method
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Technical visit : length measurements, drilling points, verification of the location of the electrical panel, assessment of the gravity drainage slope.
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Drilling and sealing : clean core drilling with watertight bulkhead , anti-friction protectors for connections, and caulking in neutral colors.
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Installation and leveling : drilling template, dowels adapted to the substrate, firmly anchored flange, bubble control .
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Connections : calibrated flares, tightening torque with a dynamometer , brazing under nitrogen on the outside, nitrogen leak test.
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High vacuum : deep vacuum, stabilization, closure and fluid release according to the manufacturer's procedure.
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Start-up and setup : checking superheat/subcooling , intensity, noise, and customer training on seasonal maintenance.
Result: immediate comfort and controlled aesthetics
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Stable temperature in the living area, even during rapid variations in spring and autumn;
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Reduced noise level thanks to the cushioned head support and the optimized blowing profile;
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Discreet installation : the path to the right of the unit remains simple; on request, we offer decorative covers coordinated with the wall colors for an even more integrated look.
Good practices for use and maintenance
To get the most out of your heat pump :
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Maintain a constant setpoint (21–23°C) rather than large deviations;
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Clean filters every 4 to 8 weeks depending on occupancy and the presence of animals;
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Clear the outdoor unit of snow and debris, check the drain for dripping ;
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Schedule annual HVAC maintenance : electrical inspection, sensors, communication, static pressure, gentle cleaning of batteries.
These actions extend the life of the system, maintain energy efficiency and ensure constant comfort.
Tips for duplex and triplex owners in Montreal
In typical buildings in Rosemont , Villeray or Le Plateau , a well-placed wall-mounted heat pump can often cover two adjacent rooms thanks to sweeping and controlled stratification . When the home is more compartmentalized, we offer MultiZone Midea or Gree configurations to power 2 to 3 indoor heads, while streamlining the wiring and optimizing the refrigeration lengths .
Why AirGreen
We serve households in Montreal, Laval, Longueuil, the North Shore and the South Shore every day with certified installations, realistic deadlines and complete documentation for assistance programs. Our strength:
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Equipment selection aligned with actual usage profiles;
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Compliant, tested and measured HVAC installation ;
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Support for subsidies and maintenance;
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Accessible and transparent after-sales service .
Conclusion
This Midea Midea28 wall-mounted heat pump installation in Rosemont–La Petite-Patrie illustrates our approach: precise sizing , a clean route with gravity drain , meticulous configuration and commissioning validated by measurements. The result is four-season comfort , energy savings and careful integration that respects the interior aesthetics.
AirGreen — your trusted HVAC partner in Greater Montreal.