Installation of a Gree — R-32 wall-mounted heat pump in Mercier–Hochelaga-Maisonneuve
Careful installation of a Gree R-32 wall-mounted heat pump on a brick facade in Mercier–Hochelaga-Maisonneuve : galvanized supports, electrical disconnection, optimized clearances. AirGreen, HVAC experts for Montreal, Laval, Longueuil, North Shore, South Shore .
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The job on one screen
The article, chapter by chapter
A clean and robust installation on a brick facade, designed to last and for the comfort of a Montreal plex
At AirGreen , we work every day in plexes and condos across Greater Montreal. This project in Mercier–Hochelaga-Maisonneuve features a Gree wall-mounted heat pump (R-32 refrigerant) installed on galvanized wall brackets high up in a typical East Island courtyard. The goal: to provide efficient, quiet, and reliable heating and cooling without encroaching on floor space or obstructing access to the patio.
Why this choice is wise for Montreal, Laval, Longueuil, North Shore and South Shore
Brick buildings with exterior balconies and narrow passageways impose constraints: limited space, close neighbors, harsh winters. The modern R-32 wall-mounted heat pump perfectly meets these local realities: high efficiency, low noise footprint, heating performance in extreme cold, and simple maintenance. For households in Montreal, Laval, Longueuil, the North Shore, and the South Shore , it is a compact HVAC solution that reduces energy costs and improves comfort year-round.
Housing context and construction site constraints
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Building type: Montreal plex with brick facade and balcony at the patio door level.
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Access: interior courtyard, limited access; our teams plan handling and tools accordingly (ladders, harnesses, lighting management for work at the end of the day).
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Height: Outdoor unit mounted on the floor , above snow level and away from debris; excellent protection against winter accumulations.
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Neighborhood: respect clearances for air circulation and minimized noise pollution (choice of wall, fan orientation, mechanical damping).
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Electrical safety: Outdoor disconnect box in the immediate vicinity, in accordance with good HVAC installation practices.
Choice of equipment
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Brand: Gree , recognized for its high-performance and robust murals for the Quebec climate.
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Technology: high-efficiency inverter compressor with R-32 (better environmental performance than R-410A and increased performance).
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Capacity: selection sized according to the volume to be treated and the insulation of the accommodation (main rooms upstairs), in order to avoid over/under-sizing.
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Noise: reduced noise level, relevant for Montreal courtyards and alleys .
Visible installation details and best practices
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Galvanized wall brackets : reinforced load-bearing brackets, anchored in the brick with appropriate sealing, careful leveling and bracing. This solution:
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releases the ground grip ;
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protects against snow, salt and shocks ;
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facilitates defrosting in heating mode.
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Installation height : raised installation for optimal air release and evacuation of defrost water without splashing onto traffic areas.
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Refrigerant connections : short and direct path; continuous anti-UV insulation ; curvature radius respected to protect the compressor.
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Power supply : dedicated external disconnect , waterproof enclosure and sheathed wiring; circuit breaker rating according to nameplate.
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Vibration management : controlled tightening, pads and fixing torque according to the manufacturer's template to prevent transmission to the brick walls.
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Easy maintenance : guard above and around the unit for service access , coil cleaning and diagnostics.
Key steps in the AirGreen process
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Thermal validation and on-site survey (orientation, shading, clearances, structural constraints of the brick).
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Sizing the heat pump and checking the existing electrical circuit.
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Controlled drilling (short crossing towards the interior) with watertight bulkhead.
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Brazing / fittings under nitrogen, nitrogen leak test , then high vacuum < 500 microns.
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Commissioning : heating/air conditioning settings, partial and full load tests.
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Transfer to the customer : explanation of maintenance, defrosting, eco mode and seasonal planning.
Result for the family: discreet comfort and savings
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Reliable heating in the off-season and in cold weather, with optimized defrost cycles.
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Uniform air conditioning in summer, particularly pleasant for the upstairs rooms served by the indoor head.
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Lower energy bills compared to electric baseboard heaters and older R-410A appliances.
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Silence in the inner courtyard thanks to the fan and the thoughtful layout.
What we routinely monitor on brick plexes
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Anchoring : brick requires suitable anchors and seals ; we do not accept improvised fixings.
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Clearances : air inlet/outlet, corners and railings; avoid recirculation of hot/cold air near a balcony.
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Defrost drain : tilt the unit and route the water to avoid creating ice on the access points.
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Wiring : No exposed dangling loops ; everything is secured and protected.
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Aesthetics : alignment, discreet passages and colors consistent with the facade.
Maintenance recommended by AirGreen
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Two cleanings per year (inner head filters and rinsing of the outer coil).
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Winter inspection : snow clearance, frost and drainage check.
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Electrical check : disconnection terminal, tightening of terminals and condition of sheaths.
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Periodic service visit : pressure/temperature measurement, inverter validation, updating of usage recommendations.
Grants and eligibility (to be checked depending on the period)
High-performance R-32 wall-mounted heat pumps with high heating efficiency may be eligible for energy efficiency assistance programs in Quebec. We guide our clients in Montreal, Laval, Longueuil, the North Shore, and the South Shore to prepare applications and maximize assistance when the unit's configuration and performance allow.
Practical advice for your project
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Installation height : favor elevation on brackets to avoid snow and vandalism, especially in alleys.
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Short route : install the outdoor unit near the main room to limit losses and optimize modulation.
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Noise : Choose a quiet range and position the unit away from bedrooms.
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Electricity : provide a dedicated line with disconnection accessible to the technician.
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Winterization : clear the unit after storms; avoid closed shelters which suffocate the unit.
What this installation says about our method
This installation in Mercier–Hochelaga-Maisonneuve illustrates our approach: site analysis , anchoring quality , aesthetic care , testing and documented commissioning . The result is a clean, durable HVAC installation optimized for four-season comfort, compatible with the requirements of a dense and lively neighborhood.
Fast Fair
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Type : Gree single-zone R-32 wall-mounted heat pump .
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Support : galvanized wall brackets on brick, clearances respected.
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Electricity : outdoor disconnect box , dedicated circuit.
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Advantages : high efficiency, very cold heating , efficient air conditioning , low noise .
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Areas served : Montreal, Laval, Longueuil, North Shore, South Shore .
Need a quote?
We offer a 100% free on-site estimate and clear recommendations (capacity, location, options). Our AirGreen team then plans a careful, compliant, and aesthetically pleasing installation, tailored to your brick building or condominium.
Integrated natural keywords: heat pump , wall-mounted air conditioner , HVAC installation , HVAC maintenance , Montreal , Laval , Longueuil , North Shore , South Shore .
The job tools
Two quick checks with real numbers: what heat costs, and what your current heaters add up to in BTU/h.
Conversion: 1 W = 3.412 BTU/h. An indication, not a load calculation: baseboards and furnaces are often stronger than the real need, and they can stay as backup. AirGreen confirms the capacity on site.
How the job unfolds
The main steps of this kind of job at AirGreen. Every house has its quirks: the estimate brings them out.
We look at the room, the outside wall, the line route and where the outdoor unit will go. That is where the capacity gets chosen.
Model, capacity and price, in writing. We also check whether the model qualifies for assistance programs.
Floors and furniture protected, wall plate position marked level, wall opening located.
A single opening, with the slope the drain needs to flow outside.
Set on a stand raised above the snow, with the clearances the manufacturer requires.
Connected, insulated and protected. The opening is then sealed against water, cold air and insects.
A dedicated circuit and an accessible disconnect near the outdoor unit.
Leak test, vacuum, then start-up and a check of heating and cooling.
Remote, modes, filters: we show you the essentials before we leave.
- The on-site estimateWe look at the room, the outside wall, the line route and where the outdoor unit will go. That is where the capacity gets chosen.
- The quoteModel, capacity and price, in writing. We also check whether the model qualifies for assistance programs.
- Getting readyFloors and furniture protected, wall plate position marked level, wall opening located.
- The wall openingA single opening, with the slope the drain needs to flow outside.
- The outdoor unitSet on a stand raised above the snow, with the clearances the manufacturer requires.
- Lines, cable and drainConnected, insulated and protected. The opening is then sealed against water, cold air and insects.
- The electrical workA dedicated circuit and an accessible disconnect near the outdoor unit.
- Tests and start-upLeak test, vacuum, then start-up and a check of heating and cooling.
- The walkthroughRemote, modes, filters: we show you the essentials before we leave.
What we check on a job like this one
Each number is a point we check on site. Switch between summer and winter to watch air and heat move.
In summer, the outdoor unit rejects the house's heat outside.
Generic illustration of this type of installation, not a survey of this job site. Tap a number.
Mounted level on a wall plate, high enough for the air to reach the whole room, with enough space around it to slide the filters out easily.
The refrigerant lines, the communication cable and the drain go through the wall in a single opening, sealed against water, cold air and insects.
Two insulated copper pipes connect the two units. Outside, a line cover can protect them from sun, knocks and weather.
A shut-off switch near the outdoor unit isolates it safely for service. It must stay accessible at all times.
The compressor and the fan. In heating mode it captures heat from the outdoor air, even in winter, and moves it inside.
On the ground or on the wall, it keeps the unit above accumulated snow. The unit stays clear and defrost water can drain away.
The fan needs to blow freely. Storage, a fence or a wall too close, and efficiency drops while noise goes up.
Is your home ready?
Check what applies at your place. A "no" is not a refusal: it is what we sort out during the estimate.
Good habits, once the unit is in place
Six simple habits that keep the unit going. Your list stays on this device.
What to do, season by season
Three habits per season for this unit. They take a few minutes and prevent many calls.
- Clean the indoor unit's filters.
- Clear leaves and debris left on the outdoor unit by winter.
- Test cooling before the first hot days.
- Clean the filters more often when the unit runs a lot.
- Keep plants away from the outdoor unit.
- Check that no water drips from the indoor unit.
- Rake the leaves around the outdoor unit.
- Test heating before the first cold days.
- Book periodic maintenance before winter.
- Keep snow away from the stand and the front of the unit.
- Let the unit defrost: it is normal.
- Never hit the ice on the fins; call us if the unit stays iced up.
The right pages, at the right time
Four statements: true or false?
It all comes down to details you have just seen.
1. In heating mode, the outdoor unit can produce water.
During defrost cycles. That water must drain away without forming ice.
2. You pick the capacity with a simple square-footage rule.
Windows, insulation, orientation and how the room is used all count. Capacity is chosen on site.
3. A multi-zone connects several indoor heads to a single condenser.
One head per room, all on the same condenser. Each room keeps its own temperature.
4. The disconnect can sit behind the patio furniture.
It must stay accessible: it is what shuts the unit off for service.
0 / 4 right answers
What people ask us about this kind of work
Does a wall-mounted heat pump heat in winter?
Wall-mounted or multi-zone: how do I choose?
Where does the outdoor unit go?
Are there grants?
Do I need a permit?
How cold can it heat?
How much can I save?
How is the LogisVert assistance calculated?
Is it noisy?
The outdoor unit is covered in ice: is that normal?
Does AirGreen hold the required licences?
Is the estimate free?
No question matches. Write to us: we answer.
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Text and photo: a real AirGreen Climatisation & Chauffage job. The diagrams are generic illustrations of the type of installation, not a survey of this job site. Sources of the added figures: airgreen.ca product pages (NEEP / AHRI performance), Hydro-Québec (Heat pumps page, LogisVert, read on 13 October 2026), Régie de l’énergie (rate D as of 1 April 2026).