Installation of a GREE (R-32 range) wall-mounted heat pump in Sainte-Dorothée (Laval)
AirGreen installs a GREE wall-mounted heat pump (R-32) in Sainte-Dorothée: high snow supports, clean finishes, electrical compliance and lasting comfort. HVAC service in Montreal, Laval, Longueuil, North Shore and South Shore.
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Efficiency in extreme cold: a careful installation that protects performance… and peace of mind
At AirGreen , we take care of every HVAC installation so that the heat pump delivers comfort in both summer and winter, without excessive noise or loss of efficiency. This project in Sainte-Dorothée illustrates our method: thoughtful placement, high snow supports, clean finishes, and impeccable electrical compliance.
Home Context and Goals
Single-family brick house with garden-level windows and a paved driveway. The client wanted:
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efficient heating even in the typical cold of Laval;
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stable cooling in summer;
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discreet operation near a hedge;
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a durable installation that avoids problems with frost, defrost water and noise.
Technical choice: GREE wall-mounted heat pump (R-32 refrigerant)
We are installing a new-generation GREE R-32 outdoor unit paired with an indoor wall-mounted unit. This choice meets three priorities:
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High seasonal efficiency to reduce electricity bill;
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Operation in extreme cold (service ranges adapted to the climate of Greater Montreal, down to marked negative temperatures depending on the range);
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Compact and low noise , ideal for suburban residential environments.
Model: The equipment belongs to a recent R-32 range from GREE . When the exact reference is not required by the customer, we favor the range offering the best capacity/noise compromise for the room served.
Outdoor installation: winter performance a priority
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Raised galvanized aluminum supports , anchored in the paving: keep the condenser above the snow level and facilitate the flow of defrost water.
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Clearances respected on all sides for air intake and blowing.
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Orientation chosen to limit air recycling and gusts; the neighboring hedge serves as a screen against the wind without hindering the flow.
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Vibration insulation under the support points to maintain silence inside.
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Frost and water management : the area under the unit is clear; in the event of exceptional accumulation, simple manual maintenance is sufficient to keep the area free.
Refrigeration holes and connections: cleanliness and durability
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Most direct route between the indoor head and the outdoor unit: a clean bore through the brick with a waterproof sleeve .
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New refrigeration lines with high-density continuous insulation; discreet exterior capping (pale tone close to the color of the appliance) for a clean finish and UV protection .
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Estimated length 3 to 5 meters, perfectly within the recommended load and pressure drop tolerances.
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Drainage : the indoor head is gravity-fed towards the outside; the outdoor unit manages defrosting by free flow under the supports.
Power supply and compliance
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Dedicated circuit from the main panel (240 V), rating and circuit breaker compliant with the heat pump loads.
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Disconnect box installed near the condenser for maintenance safety.
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Cable routing protected in conduit; sealing of the crossings to prevent infiltration of air or moisture.
Interior: targeted comfort and silence
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Head position chosen for uniform airflow and stable comfort without direct air currents on the occupants.
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Initial settings : flow calibration, seasonal settings, night-time savings programming.
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Reduced noise level thanks to external anti-vibration pads and precise alignment of the support.
Results measured at the customer
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Rapid temperature rise during cold weather testing, without short cycles.
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Controlled consumption in off-season heating mode; the existing electric auxiliary resistance remains a backup solution, rarely used.
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Acoustic discretion appreciated on the facade and in the room served.
Preventive maintenance recommended by AirGreen
Regular maintenance maximizes lifespan and performance:
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Clean the internal filters every 4 to 8 weeks during the season.
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Annual inspection : pressure, temperatures, connections, tightening, condition of insulation, tank and drainage.
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Winter : Keep the area under the unit free of snow and ice ; never obstruct the sides.
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Spring : gentle washing of the external battery, checking of the capping and anchors.
Grants and eligibility (depending on configuration)
Recent high-efficiency wall-mounted heat pumps may be eligible for Quebec's efficiency programs when seasonal performance and low-temperature capacity maintenance criteria are met. We validate these points for each file and prepare supporting documents, if necessary.
Why AirGreen for your HVAC installation in Laval, Montreal, Longueuil, North Shore and South Shore?
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Local expertise : teams accustomed to the climatic realities of Greater Montreal and winter requirements (snow, frost, winds).
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Tailor-made approach : sizing by room, study of the route, aesthetic integration.
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Installation quality : durable fixings, clean seals, careful wiring, complete testing.
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After-sales service : maintenance reminders, seasonal checks, usage tips to optimize savings.
Points of attention for your project
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Height and clearances : A condenser that is too low or too close to an obstacle loses efficiency and becomes covered in frost; raised supports are essential.
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Drainage : anticipate the path of the defrosting water to avoid ice on the paths.
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Noise : thoughtful installation and anti-vibration pads prevent structural resonances.
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Aesthetics : well-placed capping and a suitable color blend in with the facade.
Next step
Whether you're in Montreal, Laval, Longueuil, on the North Shore or the South Shore , we quickly assess your home and recommend the most suitable GREE wall-mounted heat pump : BTU capacity, cold operating range, noise level and control options. Our team then plans a clean, safe and durable installation, just like in Sainte-Dorothée.
Meta usage tips
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For heating: favor a stable setting rather than large day/night variations.
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In air conditioning: use AUTO speed to keep humidity under control.
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In winter: never cover the unit; clear snow around and under the support.
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Before the heatwave: carry out spring cleaning to restore full heat exchange.
In Sainte-Dorothée, this installation highlights what makes the difference in residential HVAC : the method . A high-performance heat pump is first and foremost a smart installation, designed for Quebec's climate and for your daily life.
Need an estimate? We operate weekly in Laval , Montreal , Longueuil , as well as on the North Shore and South Shore . Our team guides you from choosing equipment to applying for grants, then ensures simple and efficient HVAC maintenance , year after year.
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).