A precise construction site in a passageway: uniform comfort without compromising circulation
At AirGreen , we are working on a single-family home in Brossard (South Shore) . The owners' objective is clear: to cool the upper floor in summer , heat efficiently in the off-season and in cold weather , and stabilize the temperature of a corridor at the top of the stairs that leads to the bedrooms. The configuration imposes a constraint: the indoor unit must be installed above a busy staircase landing , with doors and passageways nearby. We offer a Midea wall-mounted heat pump – Midea28 range ( R-454B refrigerant, extreme cold performance), calibrated to provide silence , efficiency and consistent comfort throughout the entire floor.
Why a Midea wall-mounted heat pump (Midea28 range) here?
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Extreme cold : the Midea28 range maintains a solid capacity down to −30°C , an asset for Greater Montreal.
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High efficiency : advantageous seasonal coefficients, tangible energy savings compared to convectors and old R-410A air conditioners.
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Fine comfort : inverter modulation , intelligent defrosting , gentle blowing ideal at the top of the stairs (no aggressive air current towards the bedrooms).
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Next-generation refrigerant (R-454B) : lower GWP/PRP than R-410A, better efficiency and prepared for upcoming standards .
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Silence : noticeable “quiet” mode, appreciated in night areas.
Load study and sizing
Capacity calculations and choices
We evaluate the surface area of the floor, the orientation of the rooms, the quality of the envelope and the solar gain. The served area includes landing + corridors + access to the bedrooms . The significant need in summer is concentrated in the late afternoon periods; in winter, the need for heating is felt especially during losses through the stairs. We retain a capacity range of 12,000 to 15,000 BTU (depending on the final configuration), which allows:
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a rapid drop in temperature during peaks,
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low-speed modulation while maintaining, for optimal savings.
Airflow and landing placement
Positioning high above the stair landing has two advantages:
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Natural diffusion : the air flow goes down the stairs and is distributed towards the bedrooms;
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Safety and clearance : the device is out of reach and does not interfere with door opening.
We adjust the angle of the shutter to prevent any direct blowing onto passageways. The fan speeds are set so that the noise level remains consistent with a nighttime area.
Installation details: clean, discreet and durable
Refrigerated drilling and paths
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Precise drilling in the upper part, with a slight slope for managing the condensate drain .
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Capped route ( white capping , matching the woodwork) to the exterior exit, minimizing the visual impact in the corridor.
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High density insulated annealed copper refrigeration lines , taped and sealed at wall penetrations (air barrier).
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Optimized total length (≈ 6–10 m depending on the facade), in order to maintain full performance and facilitate maintenance .
Condensate management
Above a staircase, gravity is not always possible. We therefore integrate a compact and silent condensate pump hidden behind the casing, with an anti-vibration service line and integrated siphon . The discharge is made outside on the facade side, protected against frost and designed to avoid any runoff onto the cladding.
Outdoor condenser and protections
Even if the compressor does not appear in the photo, we apply our AirGreen standard:
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Robust wall support or base on slab depending on the facade, anti-vibration silent blocks ;
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Regulatory clearance for optimal air sweeping ;
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Snow cutter (if exposed) and leaf guard ;
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RBQ certified exterior circuit breaker and electrical routing .
Electricity and compliance
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Dedicated power supply compliant with the Quebec Electrical Code , correlated to the Midea nameplate;
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Circuit breaker calibration and conductor section validated;
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Communication between protected units;
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Nitrogen leak tests , deep vacuum (≤ 500 microns), dehydration control.
Commissioning and fine-tuning
Key steps
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Refrigeration check (pressures, suction/discharge temperatures, superheat/subcooling).
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Remote control pairing and Auto/Heat/Cool/Dehumidify mode configuration.
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Shutter calibration to sweep the landing without blowing directly towards the doors.
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Acoustic measurement and speed adjustment for low noise levels at night.
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Condensate test under simulated load.
Result
The landing and adjoining bedrooms gain 2 to 3°C in uniformity during heatwaves, and the staircase no longer “pulls” cold from the bedrooms in winter. Perceived comfort increases significantly, with controlled electricity consumption thanks to modulation.
Grants, Eligibility and Responsible Choices
In Greater Montreal ( Montreal, Laval, Longueuil, North Shore, South Shore ), high-efficiency wall-mounted heat pumps like the Midea – Midea28 range (R-454B) are generally eligible for current incentive programs when efficiency and performance criteria in extreme cold are met. We support our customers for:
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check eligibility (model, power, performance thresholds),
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assemble the evidence (detailed invoices, photos, AHRI numbers),
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submit applications on time.
HVAC maintenance and system sustainability
AirGreen Best Practices
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Annual cleaning of the evaporator battery , the turbine-fan and the filters ;
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Checking the condensate pump and rinsing the discharge;
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Refrigeration load control and inspection of external covers ;
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Updated seasonal settings (shutter, speeds).
Regular HVAC maintenance ensures efficiency , air quality and longevity . We offer maintenance plans with annual reminders, particularly relevant for installations in high-traffic areas such as stair landings .
Daily usage tips
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In summer , stabilize at 23–24°C and favor Dry mode on heavy days to dehumidify without overcooling.
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In winter , use Heat mode with Auto ventilation ; avoid frequent setpoint variations .
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Maintain clearance under the unit (no high shelves or decorations directly in the jet).
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Clean filters every 4 to 8 weeks depending on usage.
What makes AirGreen different in Brossard
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HVAC installation expertise in constrained spaces (staircases, mezzanines, corridors).
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Aesthetics : matching capping , discreet route, clean sockets and cuts.
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Safety : safe working methods at height , protection of steps and passageways.
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Complete support : from sizing to subsidies , including commissioning and maintenance .
Are you considering a wall-mounted heat pump in Brossard, Longueuil, Montreal, Laval, or on the North Shore ? Our team will travel quickly, provide the right size , and deliver a careful installation that respects your interior.
Express FAQ
A unit above a staircase, is it noisy?
No. Well sized and modulated at low revs , the Midea28 remains very discreet . The flap adjustment prevents air turbulence.
Is the condensate pump reliable?
Yes, when chosen for flow rate , installed with anti-vibration and maintained . We test each pump upon commissioning.
What if, later, I want a second head for a bedroom?
We offer R-32/R-454B compatible multi-zone solutions according to your needs; we evaluate the total capacity and balancing room by room.
Project review
This HVAC installation in Brossard demonstrates that a well-designed wall-mounted heat pump can transform a circulation space into a core of comfort for the entire floor. The Midea – Midea28 range provides efficiency , silence and thermal stability , with exemplary visual integration . At AirGreen, we deliver clean, durable and compliant work , ready for Quebec winters and humid summers .