Outdoor unit on brackets, under a brick balcony: careful integration and four-season performance in a HoMa plex
Project context and objectives
In a typical plex in Mercier–Hochelaga-Maisonneuve , we deployed a complete HVAC installation around a Goodman wall-mounted heat pump (single-zone) intended to:
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efficiently air-condition the main floor in the summer,
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provide modulating supplemental heating in spring and autumn,
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preserve the aesthetics of the brick rear facade,
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reduce the transmission of vibrations to the wooden structure of the balcony,
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guarantee simple and safe maintenance.
The client was looking for a reliable solution with a controlled operating cost , capable of integrating into the habits of a Montreal home with stacked balconies and common circulation. We proposed a short configuration in refrigeration connections, with an outdoor unit on metal brackets and a gravity drain path , to maximize efficiency and durability.
Why choose a Goodman wall-mounted heat pump?
The Goodman wall range is recognized for:
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compressor modulation allowing stable comfort without overheating or short cycles,
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proven components, easy access for maintenance, and excellent parts availability ,
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compatibility with the needs of apartments and plexes in Greater Montreal , where compact routes and robust fixings are preferred.
Depending on the surface area served and the level of insulation, the usual powers (from 9,000 to 24,000 BTU ) cover the majority of 3.5 to 6.5 configurations. Our team systematically sizes the capacity based on actual thermal loads (orientation, glazing, sealing, infiltration), in order to avoid oversizing which degrades comfort and seasonal efficiency.
Installation of the outdoor unit: wall brackets and vibration management
Choice of support
The outdoor unit is fixed on galvanized brackets anchored in the brick with appropriate dowels and sealing. The reasons for this choice:
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ground clearance : the unit remains out of reach of snow, leaves and running water,
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protection : the balcony overhang creates a micro-shelter which limits the direct snow load and bad weather,
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maintenance : accessibility for cleaning the exchanger and pressure measurements is facilitated.
We insert high-resilience anti-vibration pads between the unit and the brackets to reduce the transmission of low frequencies into the masonry and wooden structure of the balcony.
Respect for clearances
Rear, side and front clearances are respected to ensure optimal airflow for both air conditioning and heating (defrosting). The discharge axis is oriented to avoid any air recycling against the underside of the balcony.
Refrigeration connections and capping: short route, minimal losses
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Wall crossing as close as possible to the interior head in order to limit the linear length and pressure losses.
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High density continuous insulation on both lines (liquid/gas) with UV tape and matching outer capping to protect the copper and communication cable.
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Dedicated service loop near the unit to allow future operations (pressure reading, maintenance).
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Bending radius respected to preserve the integrity of the tubes.
Condensate management and winter behavior
The elevated installation allows for a gravity drain with a controlled slope towards the outside. In cold weather:
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defrost water is channeled away from masonry and traffic,
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a clearance under the unit prevents the formation of an ice pile.
The customer receives clear instructions to clear the area in winter and maintain free airflow.
Architectural integration and envelope protection
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Clean drilling with vapor barrier and collars; airtightness is restored to prevent infiltration and thermal bridges.
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Fixings positioned to respect the brickwork and joints, without weakening the masonry.
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Water drip provided under the base to direct runoff away from the facing.
Commissioning and quality controls
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Extended vacuum , leak testing and pressure stabilization.
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Polarity control and dedicated electrical protection gauge .
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Checking sound levels , fan speed and supply/return temperatures.
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Initial setup (modes, oscillation, night silence) and delivery of an HVAC maintenance protocol to the owner.
Results measured after start-up
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Air conditioning : rapid temperature reduction, with stable performance thanks to the short path and the absence of recirculation of outside air.
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Additional heating : gradual and even temperature increase, fine modulation limiting setpoint variations.
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Acoustics : Anti-vibration pads and the direction of the rejection preserve tranquility on the balcony and inside.
Best practices provided to the customer
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Clear snow and clear the unit in winter, especially in front of the discharge grille.
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Clean the external exchanger with fresh water in spring (low pressure, power off).
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Indoors: Wash filters every 4 to 8 weeks depending on use; avoid blocking the blower opening with curtains/tall furniture.
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Recommended guidelines : 23–24°C in summer, ~21°C in winter for a good comfort/energy balance.
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Schedule annual maintenance : electrical check, pressures, evaporator/condenser cleaning, drain check.
Common pitfalls in Montreal plexes — and our solutions
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Oversizing an inner head: short cycles and discomfort; we size according to the actual load .
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Undersized brackets : vibration risk; we use certified supports and anchors suitable for solid brick or blocks .
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Air recycling under low balcony: we adjust the height and orientation for free discharge.
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Approximate drainage : insufficient slopes or frost; we provide a direct route and, if necessary, a protected heating cable .
Grants and eligibilities (Montreal, Laval, Longueuil, North Shore, South Shore)
Wall-mounted heat pumps that meet cold climate efficiency criteria may be eligible for provincial and federal programs. Our team:
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checks the eligibility of the chosen system,
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gathers supporting documents (quote, commissioning certificate, proof of installation),
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supports the client until the submission of requests and monitoring of deadlines.
What makes AirGreen different?
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Thermal study and impartial advice on capacity and location.
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Finish : aligned cappings, stainless steel screws, clean seals, respect for the masonry .
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Local responsiveness throughout Greater Montreal ( Montreal , Laval , Longueuil , North Shore , South Shore ).
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After-sales service : maintenance reminders, parts availability, technicians trained in extreme cold protocols.
Frequently Asked Questions (selection)
Isn't a unit under a balcony suffocating?
No, if the clearances and discharge orientation are respected. We validate the height , lateral space and the absence of obstacles to avoid air recycling.
What happens during defrosting in winter?
The unit reverses its cycle briefly to melt the frost. We provide clear drainage and clearance under the unit to prevent ice buildup.
Can I add a second inner head later?
On a single-zone system , a second independent head with its own condenser can be installed if the electricity and the facade allow it. To serve several rooms via a single condenser, we offer suitable multi-zone solutions .
Conclusion
This HVAC installation of a Goodman wall-mounted heat pump in Mercier–Hochelaga-Maisonneuve illustrates AirGreen 's expertise in Montreal plexes: robust brackets , anti-vibration , short path , gravity drain and strict compliance with clearances. The result: four-season comfort , silence , preserved aesthetics and simple maintenance. For a clear and fast quote in Montreal, Laval, Longueuil, North Shore or South Shore , our team will support you from the study to the subsidies .
Need an on-site assessment? We offer the right capacity, the best location, and a flexible installation schedule, all with the meticulous workmanship we're known for.