A well-positioned indoor heat pump makes all the difference: under a skylight, this Sharp heat pump brings precise comfort to a room prone to temperature fluctuations. Here's how we transformed a typical Rosemont living space into a quiet, energy-efficient, and perfectly controlled comfort zone.
Instant comfort in a room with a skylight: our approach
Rooms lit by a skylight heat up quickly in summer and cool down as soon as the sun disappears. Here, we installed a recent Sharp wall-mounted heat pump ( R-32 refrigerant) to stabilize the temperature, dehumidify efficiently, and ensure reliable heating in cold weather. The positioning under the skylight is no accident: it captures the column of hot air and prevents stratification thanks to a finely tuned air sweep.
The customer context and the performance objective
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Upper-floor condo in Rosemont–La Petite-Patrie with white ceiling and central skylight .
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Priority need: targeted cooling in summer, maintenance at 21–22°C in mid-season and support for additional heating in winter.
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Constraints: finished walls, refined aesthetics, desire for minimal noise level .
Why Sharp for this project?
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New generation R-32 wall-mounted range, high efficiency and better environmental impact than R-410A.
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Stable operation at low temperatures (depending on the size chosen) and defrosting optimized for Montreal.
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Precise control of the shutter and speed, useful for breaking the “cushion” of hot air accumulated under the canopy.
HVAC installation details: cleanliness of the route and daily silence
Head implantation
The head is centered below the skylight, at a height that allows for horizontal sweeping over the living area. We adjust the angle of the louver to direct air along the ceiling before dropping back down onto the occupied area—the most comfortable method for high rooms.
Refrigeration drilling and connections
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Compact wall crossing with discreet exit to the outside.
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Insulated copper connections, white trunking matching the wall for a minimalist look.
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Interior/exterior sealing (mastic + vapor barrier) to prevent any infiltration of air or humidity.
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Valves tightened to the torque, deep vacuum , leak test then reload as needed depending on the actual length.
Condensate management
The drainage slope is designed for quiet gravity flow . When required by the architecture, we integrate a hidden mini-condensate pump, with vibration absorbers and easy maintenance access. Here, the layout allows for clean gravity flow: no additional noise, no specific maintenance.
Power supply
Connection to a dedicated circuit compliant with the unit's rating, recommended residual current device (RCD), and aesthetically pleasing sheathing up to the connection point. We validate the voltage drop and the panel footprint to avoid any unwanted tripping during winter peaks.
Commissioning and configuration
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Checking pressures , superheat and subcooling.
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Calibration of the air probe to compensate for solar input from the skylight.
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Programming of time scenes (if remote control/Wi-Fi allows): lowering during the day, comfort on return, silent night mode.
What the owner earns in Rosemont (and throughout Greater Montreal)
Year-round comfort
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Summer : rapid cooling of occasional overheating, gentle dehumidification for a cooler feeling.
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Winter : contribution to heating with an advantageous COP in moderate temperatures, reduction of the additional bill.
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Mid-season : precise adjustment without starting the central heating.
Aesthetics and silence
The Sharp's sleek facade blends seamlessly into a white wall without creating a visual break. The bearings are insulated, and the fan speed is modulated to remain virtually inaudible in the evening.
Energy efficiency and R-32 refrigerant
R-32 offers better seasonal performance and reduced climate impact compared to older generations. When properly sized, it promotes real savings on your bill.
Sizing: the key to a sustainable installation
Choosing the right power (BTU)
In a room under a glass roof, solar gain increases the sensible load. We take into account:
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orientation and glazed surface,
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roof insulation,
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ceiling height,
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possible infiltrations around the glass roof.
The result: power that is neither oversized (short cycles, noise, wear) nor undersized (unsatisfactory comfort during heat waves). This precision explains the thermal stability obtained from the first week of use.
Multi-zone or single-zone?
When other rooms need to be served (bedrooms, office), we offer a Sharp MultiZone Heat Pump or additional heads – always with a careful eye on the total length of the connections , the manometric height and the distribution of loads per space.
Good HVAC Operation and Maintenance Practices
Daily use
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Leave the head in auto mode for the shutter angle as the sun rotates.
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During a heatwave, start early to avoid the room getting hot.
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Avoid directing the flow directly toward the occupant for prolonged comfort.
Annual interview
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Filters : monthly cleaning in summer, bimonthly the rest of the year.
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Evaporator and condensate tray : annual professional sanitation to prevent odors and loss of performance.
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Regular checks of the drain slope and the condition of the exterior chute, especially after freezing/thawing.
These actions maintain performance, extend the life of the compressor and preserve the manufacturer's warranty .
Potential Grants and Eligibility
In Greater Montreal ( Montreal , Laval , Longueuil , North Shore , South Shore ), recent high-efficiency wall-mounted heat pumps may be eligible for assistance programs based on power, certification and cold performance. We verify for you: exact model, installation requirements, documentation and proof of performance. The goal: to maximize your return on investment while respecting technical frameworks.
What we deliver, beyond the machine
Finish and guarantees
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Clean and symmetrical finishes, aligned visuals, careful seals.
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Training in use: ventilation scenarios, night settings, simple filter maintenance.
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Photo file and technical sheet of the installation, serial numbers, and duly registered guarantees .
Measurable result
From the first days, the owner noticed:
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a uniform temperature despite the glass roof,
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controlled humidity,
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a reduction in noise compared to an old portable wall-mounted air conditioner .
Expert advice: Avoid these common mistakes
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Place your head too low under a glass roof: the flow hits the occupants and loses its reach.
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Neglecting the drain : an insufficient slope leads to odors and overflows.
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Oversize the power: short cycles, less dehumidification, discomfort.
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Ignore the sealing of the crossing: cold air infiltration and energy loss in winter.
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Forgetting the dedicated circuit : panel trips and reduced reliability.
At AirGreen, we frame each step so that the HVAC installation remains invisible on a daily basis... except for the comfort it provides.
In short
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Location : Rosemont–La Petite-Patrie (Montreal)
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Equipment : Sharp, wall-mounted heat pump (R-32 range)
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Strong points : positioning under a skylight, discreet route, gravity drain, silence and high seasonal efficiency
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Added value : usage advice, simplified maintenance, verification of eligibility for subsidies according to the model chosen