Installation of a Gree (wall-mounted residential range) wall-mounted heat pump in Villeray–Saint-Michel–Parc-Extension
Exterior installation of double Gree wall-mounted heat pumps on stainless steel brackets in Villeray–Saint-Michel–Parc-Extension: robust support, discreet cladding, complete commissioning. AirGreen, HVAC experts in Montreal, Laval, Longueuil, North Shore, South Shore.
Take a tour of the installation
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.
Two condensers on stainless steel wall brackets: a compact and durable configuration for a Montreal plex
At AirGreen , we adapt each HVAC installation to the morphology of Montreal's plexes. In Villeray–Saint-Michel–Parc-Extension, we are carrying out a double exterior installation: two Gree wall-mounted condensers installed side by side on galvanized/stainless steel brackets , fixed in the solid brick under a balcony. The owner's objective: to modernize the summer and off-season comfort of two dwellings, free up yard space, reduce noise transmitted to the neighborhood and protect the units from snow accumulations.
Client context and objectives
The building is a typical brick apartment building, with a long balcony upstairs, a narrow courtyard, and shared circulation. The expectations are clear:
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Stable comfort for two apartments, each served by a dedicated wall-mounted heat pump ( two-zone / two mono-split configuration).
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Sound discretion on the stage side.
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Zero encroachment on the ground to preserve the passage and the bicycle corner.
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Increased longevity despite freeze/thaw cycles.
We use Gree outdoor units from the residential wall-mounted range (typical capacity per dwelling: 9,000 to 12,000 BTU depending on the calculated loads), renowned for their seasonal efficiency and their resistance to the cold of Greater Montreal.
The technical choices that make the difference
Support: sized brackets and anchoring in the brick
Support determines reliability. We select heavy brackets with large plates, mechanically anchored in the brick (and not in the joint), respecting the center distances and the load-bearing capacity. Key points:
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Load and overhang validated for each device, margin included for frost and wind.
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Level and anti-vibration : pads under each condenser sole; controlled tightening torque.
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Clearances around the ventilation vents and at the rear to prevent recirculation of cold air during heating.
Under the balcony, this approach protects the machines from snow and direct runoff, while maintaining clear technical access.
Facade installation: easy ventilation and maintenance
Installing two condensers side by side requires managing the air intake/discharge :
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Center distance between machines respected to avoid thermal interaction.
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Unobstructed air discharge under the balcony soffit.
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Sufficient height to allow free passage and protect against shovel blows in winter.
We provide a simple access hatch (clear top, stainless steel screws) for maintenance, pressure reading and wiring checks.
Refrigeration and electrical routing
Each device powers a dedicated internal head. Our practices:
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Drillings through the brick with a slight slope towards the outside, with vapor barrier and elastomeric sealing.
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Vertical aluminum cladding matching the brick for refrigerant connections and condensate drain in air conditioning mode.
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14/4 cable (communication/power) in rigid sheath with stainless steel flanges; external disconnect switch within easy reach.
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Dedicated circuit breakers for the electrical panel, clearly identified per dwelling.
The short route to the inner heads limits pressure losses and fluid top-ups, which optimizes energy efficiency .
Condensate and frost management
The drains exit behind each condenser and follow the cowling. Points of attention:
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Continuous slope and insulation of cold sections to prevent freezing.
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Tips protected against splashes and insect nests.
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Under the balcony, natural drainage reduces icing; however, we maintain clearance under the frame for evacuation during defrost cycles.
Instrumented commissioning
The performance of a heat pump depends on its commissioning. Our protocol:
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Nitrogen test and electronic leak detection.
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Deep vacuum (controlled microns) to dry the circuit.
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Opening of valves, stabilization, reading of parameters at the manifold.
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Supply/return temperatures , intensities , instantaneous consumption and temperature difference per dwelling.
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Adjustable fan speeds and sweep for draft-free comfort.
Results: comfort, silence and clear facade
Comfort per accommodation
Each apartment benefits from independent control : stable setpoint, continuous modulation, and auxiliary heating reduced to a minimum during the off-season. In summer, the indoor units maintain a comfortable humidity level, improving the feeling of freshness without over-ventilating.
Controlled noise
The Gree units in this wall-mounted range offer low noise levels . The high installation on brackets reduces structural transmission to the brick and moves the sound source away from occupants in the courtyard. The distance between machines limits the cumulative nuisance.
Aesthetics and freed up space
No plinth on the ground, no obstacle to traffic in the courtyard. The simple cladding and the alignment of the brackets give a clean and rational facade.
Grants and operations in Quebec
In Greater Montreal (Montreal, Laval, Longueuil, North Shore, South Shore), high-efficiency wall-mounted heat pumps may be eligible for financial assistance programs when the certification criteria are met (cooling performance, seasonal efficiency, proper pairing of components). We assist owners in verifying AHRI numbers , collecting evidence and submitting applications.
AirGreen tips for a facade with bracketed condensers
Good usage practices
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Stable setpoints rather than temperature fluctuations.
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Clear the ventilation openings (no objects leaning against them, no hanging bins).
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In winter, avoid blocking the underside of the machines with storage.
HVAC Maintenance
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Gentle rinsing of outdoor heat exchangers in spring; be careful of debris brought in from the balcony.
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Clean the interior head filters every 4 to 8 weeks during peak season.
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Annual inspection : tightening of screws, condition of silent blocks, checking of refrigeration parameters and drain.
Mistakes to avoid
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Undersized brackets or brackets anchored in the joint : risk of tearing.
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Machines stuck together: recirculation and loss of efficiency.
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Forgetting UV protection and line insulation: premature aging and parasitic condensation.
Why entrust your project to AirGreen?
Our team is familiar with the constraints of plexes : protruding balconies, short facade distances, close proximity. We deliver:
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Load study and choice of capacity (9K, 12K, 15K… depending on actual needs).
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Clean and safe HVAC support engineering and installation .
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Certified commissioning with reading of values.
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Maintenance monitoring and assistance for grants .
In Montreal, Laval, Longueuil, North Shore and South Shore , this approach guarantees discreet, efficient and easy-to-maintain wall-mounted heat pumps , without sacrificing the aesthetics of the facade.
The big day, step by step
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 would it look like at your place?
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.
Four mistakes we do not make
Flip each card to see what we do instead.
Your own project, step by step
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.
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.
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).