Installation of a Gree Monozone R32 series wall-mounted heat pump in Le Sud-Ouest (Montreal)
Installation of a Gree wall-mounted heat pump on brackets in Le Sud-Ouest (Montreal): exterior disconnect switch, optimized clearances and careful commissioning. AirGreen HVAC installation for Montreal, Laval, Longueuil, North Shore and 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.
A suspended HVAC installation, designed for Montreal winters
At AirGreen , we prioritize robust, clean, and durable HVAC installations, adapted to the realities of Montreal's buildings. On this project in the Southwest , we are installing a Gree wall-mounted heat pump ( R32 single-zone system) whose outdoor condenser is attached to the brick wall on galvanized brackets . The client's objective is clear: to achieve four-season comfort while protecting the equipment from snow, shocks, and water splashes from the ground. The result is a raised, quiet, and easy-to-maintain installation, with a dedicated power supply and an optimized refrigeration path.
The Gree choice for a tight urban context
The Gree residential range offers fine inverter modulation, quiet operation and the use of R32 refrigerant, appreciated for its efficiency and lower load per kW. In a dense environment like the Southwest , these advantages are sought after:
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High seasonal efficiency : the machine precisely adjusts its power to actual needs, limiting cycles and consumption.
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Controlled noise level : beneficial for the occupant… and for the nearby neighbor.
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Simple maintenance : clear access to essential components, washable filters inside, and carefully designed exterior clearances.
Brick anchoring: stability and longevity
We fix the condenser to galvanized wall brackets with silent blocks under the side members. This approach:
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keeps the unit above the snow line and runoff;
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limits vibrations transmitted to the wall;
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clears ground clearance for snow removal and prevents ice buildup under the chassis.
The anchors are sized for solid brick and protected against infiltration: suitable dowels, sealing washers and external sealant. Precise level control ensures correct drainage during defrost cycles.
Air clearances and immediate environment
The front of the fan remains completely free on the front axis; the sides and the rear respect the manufacturer's minimum distances to avoid any air recycling . The presence of a nearby exhaust vent is taken into account: we direct the flow and choose the position of the device so as to avoid hot and humid discharges affecting the heat exchange.
Power supply: safety and accessibility
We install an outdoor disconnect switch within easy reach, compliant with the Quebec Electrical Code , connected by a UV-resistant conduit. The circuit is dedicated from the main panel, with appropriate rating and protection. This configuration facilitates service and secures any subsequent work.
Short and clean refrigeration route
The wall-to-wall connection is located behind the condenser to reduce line length and protect the insulation. Inside, the wall-mounted header is positioned to distribute air into the main living area; outside, the connections are covered from the outlet, protected from UV rays and impacts. The indoor unit's condensate drain is gravity- driven outwards, with a constant slope and discreet outlet.
Meticulous commissioning
Our technicians carry out commissioning in five stages:
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Deep vacuum , vacuum stability control.
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Checking leaks/pressure , mechanical and electrical tightening.
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Performance measurements : blown temperatures, intensity, inverter reaction.
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Comfort settings: auto speed, auto restart, shutter memorization.
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Customer discount : operating instructions, HVAC maintenance schedule, seasonal advice.
Concrete result for the occupier
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Efficient heating in mid-season and on moderately cold days, relieving the strain on electric baseboards.
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Uniform air conditioning in summer, with humidity management that allows for reasonable settings.
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Silence and energy sobriety , thanks to continuous modulation.
Results, savings and best practices
What we have specifically taken care of here
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Raised height on brackets: clearance under the appliance for melting frost, protection against packed snow and splashes.
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Air clearances respected despite an urban context: no obstacle in front of the fan, clear around the sides.
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Controlled vibrations : silent blocks, distributed anchoring, controlled tightening torque.
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Well-positioned external disconnect switch : safe and accessible.
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Short refrigeration path : minimized losses, preserved aesthetics.
Tips for using a heat pump in a house or apartment complex
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Stable setpoint : leaving the inverter working continuously avoids overconsumption.
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For heating, turn the shutter slightly downwards ; for air conditioning, use a wide sweep to even out the temperature.
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Filters : Rinse every 4–8 weeks depending on dust and animals.
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Exterior clearance : keep the underside free of snow/ice, do not store objects in front of the grille.
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Defrosting : It is normal to hear the appliance changing speed in cold, humid weather; avoid turning off/restarting during these phases.
HVAC Maintenance: Maintaining Performance Year After Year
We offer HVAC maintenance visits in Montreal , Laval , Longueuil , on the North Shore and the South Shore :
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Thorough cleaning of the evaporator and indoor head fan , gentle disinfection.
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Checking the gravity drain (slope, obstructions) and the exit point.
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Condenser inspection: fins, supports, tightening, condition of covers and routing.
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Electrical controls and sensors, updating optimization parameters.
Annual maintenance stabilizes seasonal performance and extends component life.
Grants: when and how to benefit from them
High-efficiency wall-mounted heat pumps may be eligible for assistance programs when their low-temperature heating performance meets current standards. We guide our clients through the eligibility analysis, file preparation (technical data sheet, certifications), and work planning process to maximize return on investment.
Common mistakes… that we avoid
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Mounting a condenser too close to the ground , exposed to snow or ice;
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Undersize or oversize the power;
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Neglecting the slope of the condensate drain or the sealing of the drilling;
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Install without an accessible disconnect switch or with insufficient air clearances;
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Leave visible connections without UV protection .
Why AirGreen in the Southwest and throughout Greater Montreal
Our strength lies in the combination of three requirements: serious sizing , impeccable finish and responsive local service . We intervene every week in Montreal , Laval , Longueuil , on the North Shore and the South Shore for heat pump or wall-mounted air conditioner projects, whether for century-old brick homes, renovated plexes or recent condominiums.
In summary
This HVAC installation of a Gree wall-mounted heat pump on brackets in the Southwest offers an economical , quiet , and weather-protected system. The respected clearances, dedicated power supply, and rigorous commissioning result in immediate comfort and controlled operating costs—exactly what urban homeowners are looking for.
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).