Two side condensers above a garage door: a clean, safe and quiet urban installation
In this brick building in Rosemont–La Petite-Patrie , we are working on a specific project: optimizing the comfort of two neighboring apartments without cluttering the courtyard. We are installing two compact outdoor units side by side on galvanized wall brackets , just above a garage door. One of the units is a Sharp (recent wall-mounted with R-32 refrigerant), the other a modern wall-mounted Gree . The objective: to provide efficient heating at low temperatures and stable air conditioning all summer long, with a discreet HVAC installation that respects clearances, safety regulations and co-ownership life.
Architectural context and site constraints
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Brick facade with concrete lintel above the garage: robust support but requiring suitable mechanical anchors (expansion dowels and sealing).
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Useful height of approximately 2.2–2.4 m above the finished parking floor: perfect for avoiding vehicle impacts and snow accumulation.
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Limited lateral space between a window and the garage ceiling drop: we choose long brackets to clear the back of the machines and promote airflow.
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Existing technical routes : passage of white ducts (capping) for the refrigerant lines and horizontal black electrical conduit for the power supply, connected to an external disconnect switch .
Technological choice: recent R-32 walls
Both units are modern, single-zone wall-mounted heat pumps that meet current efficiency requirements. The Sharp unit provides stable comfort at low temperatures, with an inverter compressor and smart defrost. The neighboring Gree unit offers comparable efficiency, ideal for a second unit on the same floor. This duo allows each occupant to manage their energy consumption independently, while maintaining a uniform appearance on the courtyard side.
Salient installation details
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Supports : pairs of galvanized steel wall brackets , sized for static and dynamic load (wind), with anti-vibration mats under the sole.
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Clearances : 30–40 cm at the rear and above, horizontal spacing between condensers to avoid recirculation of hot air in air conditioning mode and interference from defrosts in heating mode.
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Openings : sealed wall penetrations with vapor barrier and sleeve, gravity slope towards the outside.
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Drainage : gravity drainage prioritized; if unfavorable internal slope, silent condensate pump optional (not required here).
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Refrigeration connections : insulated tubes of adequate gauge, nitrogen brazed, nitrogen leak test 300–400 psi, deep vacuum < 500 microns, stabilization then opening of the fluid.
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Electricity : dedicated line from the panel, sized circuit breaker , visible disconnection box between the two condensers, compliance with clearances and routing.
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Finish : white capping on the concrete drop, clean descent on the window side, alignment of the supports for a harmonized facade.
Why raise above a garage door?
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Protection against impacts (vehicles, snow removal) and against blown snow .
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Acoustics : at this height, sound propagation is towards the courtyard, limiting the nuisance for the ground floor.
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Easy HVAC maintenance : sufficient clearance to work under the tray and direct access to the disconnection.
Measurable results, winter comfort and practical AirGreen advice
Comfort and performance in Montreal's climate
In Montreal , a good wall-mounted system must remain efficient around -20°C and handle lower cold peaks. Recent Sharp and Gree R-32 wall-mounted systems meet these criteria, with high seasonal coefficients and fine compressor modulation. Both units benefit from:
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stable heating , limiting the use of electrical backup;
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uniform air conditioning without drafts;
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better controlled consumption thanks to the inverter.
Recommended maintenance
To maintain performance:
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Cleaning the internal filters every 2 to 3 months during the season.
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Annual inspection by our team: checking the refrigeration circuit, electrical connections, drain and defrost settings.
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In winter, clear the front grilles in case of storms to prevent frost from exceeding normal defrost cycles.
Best practices that we systematically apply
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Noise study and choice of location for neighbors: positioning away from bedrooms.
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Prevention of recirculation : sufficient spacing between the two condensers and compliance with manufacturer clearances .
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Vibration management : anti-vibration mounts and compliant tightening torque.
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Durable finish : stainless steel screws, capping slope, polyurethane sealing.
Grants and Eligibility
Recent wall-mounted heat pumps , particularly R-32 and with certified performance, are generally eligible for assistance programs in effect in Quebec. Eligibility depends on the exact performance (heating power in extreme cold, certifications). At AirGreen , we validate serial numbers and technical data sheets to guide you and prepare the file, whether you are in Montreal, Laval, Longueuil, North Shore or South Shore .
Common mistakes to avoid (feedback)
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Undersize the indoor unit for a high-ceilinged space: the machine will run too fast, creating temperature variations.
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Gluing two condensers together without a gap: cross heating, increased noise, longer defrosting.
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Forgetting the slope of the drain : droplets in spring, stains on the masonry.
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Neglecting the external disconnection : electrical non-compliance and complicated maintenance.
What our customer appreciates after commissioning
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Silent in night mode, even when both systems are running.
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Fast thermal response during early morning restarts.
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Careful aesthetics : straight lines, aligned cable ducts , neutral color that blends into the facade.
What if your building looks like this?
Whether you are in a plex in Rosemont, a condo in Ville-Marie , a townhouse in Saint-Laurent or a semi-detached in Laval , this mounting on brackets above a garage is often the most rational solution. We size the heat pump based on actual heat losses, we offer Sharp , Gree , Fujitsu or Midea according to your priorities (silence, budget, extreme cold, connectivity), then we deliver a clean, tested and guaranteed HVAC installation .
AirGreen Guarantee and Follow-up
Our facilities include:
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registration of manufacturer warranties ;
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an AirGreen labor guarantee ;
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the first recommended maintenance visit , with automatic reminder;
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tailored usage tips to reduce your electricity bill.
Next step
A consultant comes free of charge to assess the length of refrigeration lines , the optimal capping route , the location of the disconnection and the drainage strategy ( gravity or pump). We then provide a clear quote , including performance options for extreme cold and an estimate of the financial assistance applicable in Montreal, Laval, Longueuil, North Shore, South Shore .
Service keywords : heat pump , wall-mounted air conditioner , HVAC installation , HVAC maintenance , Montreal , Laval , Longueuil , North Shore , South Shore .