Under a patio, four-season comfort: a clean, protected installation designed for the Laval climate
HVAC integration by AirGreen: performance, silence and uncompromising service access
At AirGreen , we have just completed the installation of a Sharp wall-mounted heat pump in the Chomedey area of Laval . The project is located under a wooden patio of a single-family home: a perfect context to illustrate our expertise in HVAC installation in semi-sheltered areas where the management of clearances , drainage and maintenance requires real technical thought.
The choice of equipment: Sharp, reliability and comfort
The Sharp wall-mounted heat pump selected here is part of the recent R-32 “Eco Inverter” series. It is distinguished by:
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a finely modulated inverter compressor to stabilize temperature and reduce consumption peaks;
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Sharp Plasmacluster™ technology for healthier indoor air;
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low noise level in heating and air conditioning mode.
The mini-split format is ideal for residential renovations in Montreal, Laval, Longueuil, North Shore and South Shore : minimally invasive, quick to install, very energy efficient , and compatible with several grant programs depending on the configuration and certified performance.
Site context: wooden substructure, coated cladding, soft ground
The condenser is installed against a plastered wall under a patio floor . The environment requires:
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vertical clearance under soffit/floor to ensure suction and discharge;
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natural protection against rain and snow which extends the life of the components;
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loose soil (earth, wood chips, gravel) requiring support independent of the ground to avoid settlement.
Support and anchors: stability and silence first
We have chosen a wall support made of galvanized brackets with anti-vibration pads . These elements:
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stiffen the installation and eliminate vibration transmissions to the structure;
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elevate the condenser to protect it from the accumulation of ice, leaves and water;
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facilitate visual inspection and clearance of seasonal debris.
The anchors are sized for the weight of the device and dynamic loads (thawing/frosting, gusts, micro-vibrations). A laser level was used to ensure the horizontality of the chassis, a key condition for fan performance and internal flow.
Refrigeration and power supply: cleanliness, accessibility, sustainability
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Refrigerant lines and cables run in a vertical technical cover matching the facade, with curvature radii respected to preserve the integrity of the insulation and limit losses.
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Outdoor disconnection box placed within easy reach, waterproof and certified , to secure any intervention.
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Service loop provided behind the casing to allow vacuuming and possible operations without excessive traction on the expanders.
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Careful jointing and sealing at the wall crossing to prevent any infiltration of air or humidity.
Condensate management: gravity-fed, simple and reliable
The station was designed to be gravity-fed , with a dedicated drain pipe exiting at the base of the condenser. Our precautions:
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continuous slope to avoid water pockets;
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outlet positioned to flow away from the base and circulation areas;
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winter recommendations to the owner (monitoring ice accumulations and clearing the orifice after storms).
When the context requires it (long length, rises), we install heated condensate pumps . Here, gravity is sufficient, which simplifies maintenance and reduces mechanical risk.
Air clearances: guaranteed performance under the patio
Under a patio, the challenge is to avoid any recirculation of hot air in winter or hot air being expelled in summer. We therefore have:
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respected the side and rear clearances prescribed by Sharp;
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left a free plenum above and in front of the unit to ensure efficient air sweeping ;
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oriented the unit to avoid obstacles (joists, risers, trays) in the discharge path.
Commissioning: AirGreen method
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Brazing under nitrogen (if necessary) and nitrogen leak test .
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Deep vacuum with micronmeter until stabilization.
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Electrical check : continuities, polarities, terminal tightening torque.
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Power-up and functional tests : delta-T, intensity, inverter behavior.
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Calibration of the remote control and complete explanation to the customer (modes, maintenance, energy optimization).
Result: comfort, silence and controlled consumption
The customer now benefits from:
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reliable heating during the off-season and winter (depending on the temperature range of the installed model);
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efficient and quiet air conditioning for humid summers;
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better indoor air quality thanks to Plasmacluster™ (depending on the indoor head used);
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a significant reduction in costs compared to traditional electric convectors.
AirGreen Recommended HVAC Maintenance
To maintain seasonal performance :
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Clean/vacuum the inner head filters every 1 to 3 months depending on usage;
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Annual inspection : heat exchange, connections, condensates, pressures and probes;
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Clearing the exterior perimeter (leaves, snow, objects) and checking the anti-vibration pads ;
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Natural de-icing : never break the ice with a tool; let the automatic de-icing do its job.
What this installation teaches owners in the greater Montreal area
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A semi-sheltered location (under a patio) is suitable if it respects air clearances and service access .
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Wall brackets remain the best option on unstable ground .
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A correctly sized technical cover protects the insulation, improves aesthetics and facilitates service .
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External disconnection is essential for safety and compliance.
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Wall-mounted heat pump = versatility : economical heating and quality air conditioning for Montreal, Laval, Longueuil, North Shore, South Shore .
Why AirGreen
We combine practical engineering , rigorous execution and teaching owners. Each project receives a tailor-made treatment : calculation of lengths, choice of supports, condensate strategy, optimization of performance and aesthetics . Our goal: to deliver an HVAC system that works at its best from day one and remains easy to maintain for years to come.