Discreet comfort and consistent performance in a Montreal apartment
At AirGreen , we install HVAC solutions that blend seamlessly into the aesthetics of Montreal homes while maximizing comfort in both summer and winter. This project showcases a Sharp ZU1 wall-mounted heat pump installed in an apartment in Rosemont–La Petite-Patrie , atop a pale yellow wall, beneath a ceiling molding. The compact and quiet unit replaces spot cooling by fans and energy-intensive electric heating. The result: a continuously cooled living space, lower bills, and a barely perceptible noise level.
Project context and client objectives
The client wishes to:
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maintain a stable temperature in the open area (living/dining room);
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reduce operating costs compared to electric convectors;
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benefit from a discreet and easy-to-maintain device;
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avoid intrusive work in a Montreal home with neat moldings.
We offer the Sharp ZU1 , a recent wall-mounted heat pump with R-32 refrigerant, recognized for its efficiency and reliability in cold climates. The single-zone solution is sufficient for the targeted area, with a capacity sized to cover summer heat peaks and heating support during the off-season.
Implementation details: clean and optimized integration
Positioning. The interior head is installed a few centimeters below the ceiling, centered in relation to the air volume to be treated. The existing molding requires precise installation to maintain visual alignment. The motorized shutter directs the airflow in a horizontal sweep to evenly distribute the tempered air throughout the open area, without blowing directly onto the sofa.
Wall crossing. We make a rear left hole (65 mm) to route:
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pre-flared and insulated refrigerant connections;
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the communication/power cable;
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gravity condensate drainage with continuous slope towards the outside.
Route and finish. The route is deliberately short to reduce pressure losses and improve the actual COP. Outside, the lines are protected by a white finishing cover (capping) matching the light-colored facades of the building. The seals are watertight (polyurethane sealant + vapor barrier) to prevent any infiltration of air or moisture.
Level and vibration. The installation is adjusted to the level to prevent water from stagnating in the condensate tray. Anti-vibration pads and controlled tightening of the anchors limit sound transmission to the lightweight walls typical of Montreal plexes.
AirGreen Method: Refrigeration Rigor and Site Cleanliness
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Flares and tightening torque to Sharp specifications; light lubrication, visual inspection and gauge testing.
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Nitrogen test (pressure test) followed by a deep vacuum down to ≤ 500 microns , stable hold to validate the seal.
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Opening of valves and commissioning according to the manufacturer's procedure; checking of intensities , supply/return temperatures and superheating/subcooling .
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End-of-work cleaning : no visible dust, intact moldings, discreet touch-ups if necessary.
Why the Sharp ZU1 in this type of housing?
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R-32 Efficiency. R-32 fluid allows for high efficiencies with moderate load; it promotes solid performance in northern climates.
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Acoustic comfort. The ZU1 series is distinguished by its quiet operation on the interior side, ideal for living rooms.
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Air quality. Easily accessible filters and Sharp's signature Plasmacluster purification technology contribute to a healthy atmosphere.
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Aesthetic and compact. The discreet design matches interior finishes (moldings, painted ceilings), without weighing down the decor.
Sizing: What we take into account
We size the capacity (BTU) based on:
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of the actual surface area of the open area;
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orientation and solar gains;
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insulation and infiltrations typical of plexes;
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of use (occupancy, internal appliances, open kitchen).
This approach avoids undersizing (overloaded equipment, premature wear) as well as oversizing (short cycles, discomfort, noise). We favor long and stable operation to maximize seasonal efficiency.
Results observed after commissioning
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Rapid cooling of the living room, with a uniform sensation thanks to the sweeping of the shutter.
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Immediate reduction in perceived noise compared to portable fans.
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Controlled electricity consumption : modulation of the compressor and fan frequency to use only the energy needed.
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Effective additional heating during the off-season, limiting the use of electric baseboards.
Tips for use for lasting comfort
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Set a stable temperature (e.g. 23°C in summer, 21°C in the off-season); avoid sudden variations.
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Keep interior doors ajar for better air circulation.
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Clean filters every 4 to 8 weeks during periods of heavy use.
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In heating mode, leave the flap facing down so that the hot air mixes properly.
HVAC Maintenance: The Key to Longevity
At AirGreen, we recommend annual HVAC maintenance including:
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removal and deep cleaning of the evaporator and blower (biofilm, dust);
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checking electrical connections and tightening;
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checking the condensate flow rate and unit level ;
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inspection of flares and lines outside (fixings, UV);
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temperature and pressure readings to validate performance.
This maintenance prevents odors, maintains performance and extends the life of the system.
Grants and Eligibility
Recent and efficient wall-mounted heat pumps may be eligible for energy efficiency programs in Quebec. Eligibility depends on the power , certified performance , and operating range in cold climates . We assist our customers in verifying model compliance and gathering the required documents (detailed invoices, serial numbers, photos).
Common Mistakes to Avoid (and How We Prevent Them)
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Incorrect head location → we validate the clearances and the blowing axis to avoid dead zones.
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Drainage without slope → we impose a continuous slope towards the outside, tested with water.
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Connections too long → we optimize the route to reduce losses, limit fluid noise and facilitate maintenance.
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Leaky holes → we apply a durable seal that is resistant to freeze-thaw cycles.
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Undersizing → we carry out a simplified load calculation adapted to the reality of Montreal buildings.
Why AirGreen for your HVAC installation in Montreal, Laval, Longueuil, North Shore and South Shore?
We combine detailed engineering , clean execution and responsive after-sales service . Each HVAC installation is documented: photos, commissioning measurements, personalized advice. Our goal: a silent , efficient and durable system, perfectly integrated into your interior.
In short
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Sharp ZU1 wall-mounted heat pump installed in Rosemont–La Petite-Patrie ; carefully installed under ceiling molding.
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Short route , gravity drain , clean external capping ; pressure tests and deep vacuum before commissioning.
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Immediate comfort, reduced consumption and simplified maintenance with AirGreen support.
Next steps
Are you exploring a heat pump for a condo, plex or house in Greater Montreal ? We assess your space, recommend the appropriate capacity (BTU) and plan a clean and fast HVAC installation , throughout Montreal , Laval , Longueuil , on the North Shore and the South Shore .