A precise construction site in a compact living space: four-season comfort without compromise
At AirGreen , we work weekly in Montreal homes where space matters. In this project located in Rosemont–La Petite-Patrie , we installed a Gree wall-mounted heat pump (R-32 refrigerant) in a bedroom-office overlooking the street. The client's goal: to significantly improve summer comfort, benefit from stable heating support in mid-season and reduce the electricity bill, all without invasive work .
Context and diagnosis: a room exposed to the sun, marked temperature variations
The room has side windows that provide significant solar gain in the afternoon. In winter, the air stratifies and the temperature drops near the floor. After our technical visit, we recommended a wall-mounted heat pump with modulated airflow : the blower automatically adjusts its speed, ensuring even circulation in a small space without unpleasant drafts.
Why Gree's R-32 range?
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High efficiency in air conditioning and low temperature heating.
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Reduced environmental impact compared to R-410A, with an optimized refrigerant charge.
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Quiet and discreetly designed units, ideal for a bedroom-office.
Choice of location: performance, aesthetics and easy maintenance
We positioned the interior head above a wardrobe , a few centimeters below the ceiling and in the immediate vicinity of the window (exterior wall). This positioning meets three requirements:
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Optimal air diffusion : the flow runs along the ceiling before spreading across the entire depth of the room.
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Short path to the outside : a single through-hole allows the refrigeration lines , electrical supply and condensate drain to be grouped together.
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Maintenance : access to the filter and the shutter remains clear despite the presence of the furniture.
We systematically respect the recommended clearances around the unit to avoid any air recirculation that would affect performance. The horizontal alignment has been electronically verified to ensure gravity flow of the drain (no pump required, guaranteeing silence and reliability).
Installation details that make the difference
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Wall-to-wall route : insulated refrigeration lines, discreet white capping matching the window surround.
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Estimated length of the connections : 2 to 3 meters , sufficient to reach the external condenser on the facade without unnecessary loops.
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65 mm drilling with bulkhead and vapor barrier seal to maintain watertightness.
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Dedicated power supply with circuit breaker in accordance with the Quebec Electrical Code ; cable marked and attached.
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Air draft check : orientation of the horizontal flaps to sweep the occupied area of the room while avoiding blowing directly towards the workstation.
Immediate result: a drop of 6 to 8°C in the room on hot days, and a stable maintenance around 21–22°C in mid-season, without over-ventilation.
Everyday performance and comfort
The Gree wall-mounted heat pump (R-32) installed here was sized for a 10–15 m² room typical of Montreal plexes. Its inverter compressor finely adjusts the power:
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Quick air conditioning on returning home then ultra-low speed to maintain the setpoint with minimal consumption .
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Efficient heating down to -25°C (depending on range configuration), ideal for covering the mid-seasons and reducing the need for electric baseboard heaters.
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Low noise level : perfect for working or sleeping in the same room.
AirGreen Best Practices for Bedroom-Offices
1) Airflow management. We pre-set the blowing angle so that the air follows the ceiling before falling gently.
2) Anti-vibration and fixings. The brackets are anchored to the uprights ; we add spacers when the wall requires it.
3) Simplified maintenance. The customer receives a maintenance schedule : filter washing every 4 to 8 weeks during periods of use, annual inspection of the refrigeration circuit by our technicians.
4) Humidity management. In summer, Dry mode helps stabilize humidity and reduce the feeling of heaviness typical of Montreal heat waves.
5) Integration with existing heating. Programming to prioritize the heat pump up to the desired switching threshold, avoiding double operation with baseboards.
Security, compliance and sustainability
Our facilities comply with RBQ and CSA standards. Each brazing operation is carried out under nitrogen to prevent internal oxidation. We carry out:
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Nitrogen leak test ,
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Deep vacuum with vacuum gauge,
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Weighing and validation of the load according to the actual length of the lines,
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Control of superheating and subcooling at commissioning.
These steps ensure seasonal performance and equipment longevity .
Possible grants and savings
High-performance wall-mounted heat pumps with R-32 refrigerant are generally eligible for assistance in Quebec. We assist our customers in verifying the criteria (power, COP/HSPF, minimum heating temperature, certification) and in preparing the files . The savings don't stop at the purchase: judicious use and regular HVAC maintenance consolidate the savings on the bill.
Common Pitfalls to Avoid (and How We Get Around Them)
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Head placed too close to the ceiling : risk of recirculation and loss of capacity. We maintain sufficient clearance and orient the shutters accordingly.
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Poorly designed drain : backflow, odors, pump noise. Here, gravity drainage with controlled slope.
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Lines that are too long or looped : excess consumption and compressor wear. We optimize the route to remain within the range's tolerances.
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Noise reduction : we insert anti-vibration strips and ensure perfect leveling of the support.
What the Rosemont–La Petite-Patrie customer gains
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Immediate comfort in summer and mid-season.
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Reduced consumption thanks to inverter control .
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Neat aesthetics : aligned capping, no unnecessary visible sheath.
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Peace of mind : manufacturer's warranty (parts/compressor) and AirGreen service for annual maintenance.
Our commitment to Greater Montreal
Whether you are in Montreal, Laval, Longueuil, on the North Shore or the South Shore , our teams plan, install and maintain HVAC systems adapted to local architecture: plexes, condominiums, single-family homes and extensions. We bring method , attention to detail and rigorous monitoring for lasting results.
In short
This Gree wall-mounted heat pump installation (R-32) in a bedroom-office in Rosemont–La Petite-Patrie demonstrates that careful and thoughtful work can achieve four-season comfort in a small space, while preserving aesthetics and energy consumption. AirGreen supports each client from sizing to maintenance , for a simple and efficient experience.