A precise, silent intervention designed for our winters: how we optimize each HVAC installation on an urban terrace without compromising interior comfort.
Client context and objectives
At AirGreen , we are working here in a typical Montreal plex with a wooden terrace overlooking an interior courtyard. The owner wanted a compact heat pump , reliable in the cold, and above all discreet to preserve the tranquility of the neighborhood. We offer a Zephyr outdoor unit, coupled with an indoor wall head, to provide air conditioning in the summer and efficient supplementary heating in mid-season and in very cold weather, according to the parameters of the chosen range.
Choice of device and technical criteria
We selected a latest-generation Zephyr wall-mounted heat pump , sized for an open-plan main living area. Our selection criteria:
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Low temperature operating range for Montreal climate .
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Reduced exterior noise level for a shared courtyard environment.
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Hydrophilic coated heat exchanger limiting the accumulation of humidity and dust.
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Compatibility with the planned refrigeration connection lengths and the existing power supply.
We recommend the Zephyr range for its ease of maintenance, the availability of parts in Montreal, Laval and Longueuil , and an excellent performance/price compromise.
Outdoor installation: stability, clearances and silence
The unit is placed on a raised aluminum support anchored in the terrace: four plates are bolted, with silent blocks under the support points to filter vibrations. This riser:
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keeps the compressor above the snow accumulation;
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ensures proper clearances on the sides and rear for air recirculation;
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facilitates the natural evacuation of defrost water.
We add a protective grille around the battery to limit accidental impacts and plant debris present in the interior courtyard. Airflow remains optimal thanks to a mesh adapted to the pitch of the fins.
Noise management
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Controlled tightening torques on fasteners to avoid structural transmission.
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Check the horizontality of the chassis to prevent any fan-related humming.
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Resonance test at different fan speed steps.
Refrigeration and food processing: short, clean, sustainable
The shortest route is preferred: a single hole in the façade on the terrace side, insulated refrigeration connections (annealed copper tubes) and power cable grouped in a discreet exterior capping matching the joinery. Inside, gravity flow of condensate is possible to the outside; no condensate pump is required, which reduces noise and maintenance.
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Estimated length of connections: 4 to 6 meters.
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Bending radius respected to preserve the section of the tubes.
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Sealing of the crossings with sleeve and UV compatible sealant.
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Grounding and dedicated circuit breaker according to the amperage of the installed Zephyr series.
Rigorous commissioning
Our standard AirGreen protocol includes:
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Flare checked and lubricated, then tightened to the recommended torque.
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Deep vacuum draw down to <500 microns, with back-up test to verify absence of leaks.
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Opening of valves and pressure control in cold and heat mode.
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Measurement of input/output temperature differences and intensities, comparison with charts.
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Recording of parameters in the maintenance logbook given to the customer.
Result: immediate comfort and neat aesthetics
The indoor fan, positioned high up on the living room side, provides a steady flow without drafts. Outside, the raised stand and protective grille blend neatly into the deck, while protecting the equipment from impacts and packed snow. Noise levels remain very low, making it ideal for the interior courtyards of Mercier–Hochelaga-Maisonneuve .
What makes the AirGreen difference
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Precise sizing : we assess the actual need (surface area, insulation, sunlight, infiltration), then validate the appropriate BTU size.
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Compliance with good practices : high vacuum, tightening torques, leak tests and current control.
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Finishes : aligned cappings, clean crossings, stainless steel fixings, controlled condensate slope.
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Follow-up : maintenance reminder and parts availability on the North Shore and the South Shore .
Recommended HVAC maintenance
To maintain performance and warranty:
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Quarterly cleaning of the inner head filters .
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Annual inspection of the outdoor heat exchanger, removal of leaves and dust.
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Checking the electrical and visual tightening of the refrigeration connections.
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Gently rinse the external battery with water (low pressure).
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Winter defrosting and drainage control.
Regular HVAC maintenance maintains seasonal efficiencies and extends compressor life.
Tips for winter in Montreal
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Keep one meter clear in front of the blowing face.
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Do not obstruct the side intake with objects or covers.
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In the event of a storm, carefully clear the snow blown against the base of the support.
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Avoid closed bins around the unit that trap cold air.
Grants and Eligibility
Depending on the Zephyr series selected and its cold performance, the installation may be eligible for current assistance programs. Criteria generally include Energy Star certification, seasonal efficiency, and low-temperature capabilities. We verify the conditions for Montreal, Laval, Longueuil , as well as the North Shore and South Shore , before finalizing the order to optimize the net cost for the customer.
Common pitfalls… and our solutions
Lack of clearance. Narrow decks increase the risk of air recirculation. Our bracket raises the unit and places it away from the railing to ensure unobstructed airflow.
Vibrations in the wooden structure. We combine silent blocks , distributed anchors and tightening torque control to avoid the resonance box effect.
Condensation in summer. The gravity path eliminates the risk of a pump overflowing and eliminates a source of noise.
Sun exposure. Optimized orientation and air circulation limit battery overheating in the afternoon.
When to choose a wall-mounted Zephyr
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Montreal apartments and plexes with needs targeted by area.
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Renovations without existing ducts.
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Looking for a high-performance wall-mounted air conditioner that also provides additional heating.
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Priority to silence and aesthetic sobriety .
Next step
We offer a technical visit to validate BTU power , location , power supply and eligibility for aid . Our team plans the HVAC installation within a realistic timeframe, with short and impeccable work windows, then ensures commissioning and handover with the customer.