Installation of a Gree Vireo R32 wall-mounted heat pump in Saint-Laurent
Two Gree Vireo R32 wall-mounted heat pumps installed on a flat roof in Saint-Laurent: galvanized supports, sheathed connections, performance in extreme cold and AirGreen HVAC maintenance for all of Greater Montreal .
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 flat-roof units for customized comfort, installed with a professional finish and designed for the climate of Greater Montreal
Project background
At AirGreen , we are modernizing the comfort of a lightweight building in Saint-Laurent (Montreal) by adding two Gree Vireo R32 wall-mounted heat pumps dedicated to separate zones. The goal: precise air conditioning in the summer, efficient heating until the bitter cold in the winter, while controlling electricity consumption.
Why the Gree Vireo R32 for this type of building
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R-32 refrigerant : better energy efficiency and reduced charge compared to R-410A.
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Low temperature operating range (Vireo R32 series) for the Montreal climate .
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9k to 24k BTU formats to adapt to each area (office, meeting room, light workshop).
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Low noise levels indoors and outdoors – essential in a tertiary environment.
Installation details – gravelled flat roof
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Location : two outdoor condensers aligned on a flat roof covered with gravel, away from traffic areas.
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Supports : galvanized steel frame on treated wooden soles , distributing the load and avoiding any pressure points on the membrane.
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Connections : insulated copper refrigerant connections, sheathed and secured; short route to the mechanical crossing to limit pressure losses.
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Power : Outdoor disconnect boxes and CSA approved cables, dedicated circuits to the electrical panel.
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Condensate management : gravity drainage on the interior side; slope ensured and insulation of sections in the cold zone to prevent frost.
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Protection : grid guards on exchangers, torque-measured tightening of flare fittings, nitrogen test and deep vacuum before loading, then control with electronic detector.
Sizing and expected performance
We size each wall-mounted heat pump based on sensible/latent loads (occupancy, solar gain, ventilation). On typical office spaces, the 12,000 and 18,000 BTU steps cover the majority of needs. As supplemental heating, the Vireo R32 maintains an advantageous COP in the negative temperatures frequently found in Montreal , Laval and the North/South Shore .
Acoustics and vibrations
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Silent blocks integrated into the supports.
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Compliant clearances to prevent any re-aspiration of air and limit wind turbulence.
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Sealed wall passage with vapor barrier sleeve and membrane-compatible mastic.
Security and Compliance
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RBQ , Quebec Electrical Code and manufacturer's recommendations respected.
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Defrosts checked in heating mode; clear slope for drainage.
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Clear labeling of circuits and grounding of each unit.
Result for the customer
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Zoned comfort : each space regulates its temperature independently.
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Energy efficiency : inverter motors and R-32 reduce annual bills.
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Simplified HVAC maintenance : easy access to both units and connections, washable interior filters, AirGreen preventive maintenance plan.
Recommended maintenance (AirGreen annual plan)
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Cleaning of batteries and fans (int./ext.), pressure control, leak test and parameter update.
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Checking the roof fixings , the condition of the soles and the mechanical tightening after the freeze-thaw cycle.
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Calibration of remote controls and usage reminder to optimize heat pump mode in mid-season.
Grants and Eligibility
Depending on the configuration (certified performance, operating ranges in extreme cold and Energy Star ), the installation may be eligible for local assistance . We check eligibility for you in Montreal , Laval , Longueuil , North Shore and South Shore , and prepare the necessary documents.
What more we bring
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Thermal analysis before choosing a device.
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Careful HVAC installation in an occupied environment, coordinated deadlines to minimize business interruption.
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AirGreen labor warranty and long-term support (parts depending on manufacturer).
Your wall-mounted heat pump project in Greater Montreal
Whether you manage a duplex, a condo or a commercial building, our teams carry out installations on flat roofs , facades or on the ground, with the same high standards. Need a quick quote for a Gree Vireo R32 or a Sharp , Fujitsu or Midea alternative? We advise you on the best solution for Montreal , Laval , Longueuil , the North Shore and the South Shore .
Key points of this achievement
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Two Gree Vireo R32 wall-mounted heat pumps , independent zones.
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Installation on galvanized supports with soles, clean crossings and dedicated cabling .
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Optimization of performance in winter supplementary heating and precise air conditioning in summer.
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Easy maintenance access and durability of the roof fixing.
Next step
Contact AirGreen for an on-site technical assessment : loads, BTU selection, connection routes, installation schedule, and maintenance options. We deliver a clean, documented site ready for the following season.
Useful keywords: heat pump , wall-mounted heat pump , HVAC installation , HVAC maintenance , Montreal , Laval , Longueuil , North Shore , South Shore , Gree Vireo R32 .
How it goes, from the first call to the end
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.
And 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.
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.
Which type of equipment for your project?
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Four mistakes we do not make
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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).