Installation of a Gree Vireo R32 wall-mounted heat pump in Villeray–Saint-Michel–Parc-Extension
HVAC installation of a Gree Vireo R32 wall-mounted heat pump in Villeray–Saint-Michel–Parc-Extension: back-to-back installation, short lines, gravity condensate and measured commissioning (~10–12 °C in blowing). Interventions Montreal, Laval, Longueuil, North Shore, South Shore.
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.
Immediate comfort, precise adjustments and R-32 efficiency in a Montreal plex
In a typical Villeray–Saint-Michel–Parc-Extension apartment, we are installing a Gree Vireo R32 wall-mounted heat pump to provide rapid cooling in the summer and stable supplemental heating in the mid-season. Our goal: a clean, quiet, and easy-to-maintain HVAC system , perfectly suited to the constraints of plexes and condominiums in Greater Montreal .
Client context and objectives
The owner was looking for:
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Responsive comfort for the main living area (living room + open dining room).
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An efficient R-32 solution, compatible with energy efficiency trends.
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A discreet installation that does not alter the interior architecture or the facade.
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Simplified maintenance and very low noise level.
We recommend the Gree Vireo R32 for its balance of performance, silence and control options (fine modes, timer, Wi-Fi depending on configuration). The operating range is suitable for hot summers and cool mid-seasons in Montreal , Laval and Longueuil .
Installation details – controlled back-to-back and careful finishing
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Configuration : Back-to-back installation. The interior head is fixed close to the ceiling to optimize air stratification; direct passage at the rear to the outside.
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Drilling : 65 mm core with slight slope for drainage; waterproof filling with vapor barrier and air barrier compatible mastic.
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Refrigeration lines : short length (≈ 3 to 5 m) limiting pressure losses; brazing under nitrogen , high-density continuous insulation, anti-abrasion collars.
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Condensate drainage : gravity , insulated pipe to prevent condensation on cold walls; discreet outlet with non-return spout.
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Electricity : dedicated power supply, calibrated circuit breaker; external disconnect switch near the condenser.
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Outdoor unit : fixed on galvanized wall brackets with silent blocks ; clearances respected for effective defrosting in winter; anchoring compliant with the support.
Performance checks at commissioning
After deep vacuuming and leak testing, we validate the pressure stability and compressor intensity. In air conditioning mode, the blown air temperature measured at the outlet drops to around 10–12°C , a sign of efficient heat exchange and a well-configured flow rate. The fan is then adjusted to balance silence and range.
Why the Gree Vireo R32 in this project?
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R-32 refrigerant : reduced charge, better EER/SEER at equivalent configuration.
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Quiet : compressor and inverter fan; night mode for sensitive periods.
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Comfort control : fine shutter adjustments, timer, automatic restart after failure.
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Performance : adapted to the requirements of several efficiency programs (eligibility to be validated on a case-by-case basis).
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Simple HVAC maintenance **: accessible filters, easy cleaning of the exchanger.
Aesthetic and acoustic integration
We take care of the exterior capping (UV channel) matching the rear facade. Inside, the head is centered for even diffusion and to avoid dead zones . The silent blocks and the anchor length reduce structural vibrations – essential in plexes with wooden floors.
Key steps of our AirGreen methodology
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Technical survey : room dimensions, wall structure, location of electrical panel, condensate drainage.
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BTU sizing : calculation based on volumes, solar gains and use; proposal 9k/12k/18k BTU depending on the thermal load.
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Installation plan : shortest route, drilling in safe area (excluding uprights/spacers), position of brackets.
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Preparation : furniture protection, tarpaulins and HEPA vacuum cleaner for a clean construction site.
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Installation : supports, soldering, line insulation, connections.
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Commissioning : vacuum < 300 microns, stabilization, top-up if required, functional test.
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Discount : mode guide (Auto, Dry, Heat, Fan), good HVAC maintenance practices , energy saving instructions.
Concrete results for the client
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Immediate comfort thanks to the cold blown air measured around 10–12°C at the outlet, even on hot days.
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Quiet noise level : the Vireo R32 operates without parasitic hum thanks to mechanical decoupling.
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Aesthetics preserved : compact capping and discreet condensate outlet.
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Controlled operating costs : inverter modulation which adapts power to actual needs.
Good usage practices
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Maintain clearances around the head and do not obstruct the grilles.
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In summer, choose a set point of 23–24°C and Dry mode on very humid days.
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In the off-season, use Heat mode for a quick top-up without restarting the main system.
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Program the timer and Eco mode when away.
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Clean the filters every 4 to 6 weeks during periods of use; plan annual HVAC maintenance (cleaning the exchanger, checking load, intensities, condensates).
Technical points to watch out for in Montreal plexes
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Drillings : respect the air barrier/vapor barrier and ensure a durable seal to prevent infiltration and mold.
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Condensates in humid climates : minimum slope and outlet protected against frost; in the case of a complex route, provide a mini-pump with a steam barrier.
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Noise pollution : choose a rear facade or a side yard, set the night mode; inform the condominium if necessary.
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Winter : Clear the outdoor unit of snow and ice; check defrosting during mild weather.
Alternatives proposed by AirGreen according to needs
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Gree Livo R32 for excellent value for money.
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Gree Sapphire R32 when extreme silence and cold performance are priorities.
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Interior systems (1-way cassette, ducted , console ) when required by the architecture.
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MultiZone R-32 heat pump if multiple rooms need to be air conditioned/heated independently.
Grant and compliance support
We assist our clients in verifying eligibility for available energy efficiency programs (performance criteria, location Montreal , Laval , Longueuil , North Shore , South Shore ) and we provide the necessary technical documents. Electrical standards and mechanical clearances are respected for a safe and durable installation.
Why choose AirGreen for your HVAC installation?
Our teams understand the realities of Montreal buildings : composite walls, restricted access, noise control, membrane management, and coordination with unions. Our construction sites are documented, our tests recorded, and our usage advice is personalized to maximize the longevity and performance of your wall-mounted heat pump .
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.
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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?
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The outdoor unit is covered in ice: is that normal?
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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).