Installation of a Willis wall-mounted heat pump in Sainte-Julie
Installation of a Willis wall-mounted heat pump in Sainte-Julie , mounted on a wall bracket above the garage. A sustainable and energy-efficient HVAC solution, ideal for comfort and subsidies in Greater Montreal.
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 custom installation for a modern South Shore home
At AirGreen , we understand that every HVAC installation project has its own unique characteristics. This is exactly what we found during this installation of a Willis wall-mounted heat pump in a residence in Sainte-Julie , on the South Shore of Montreal. The client wanted to optimize their comfort in both summer and winter while benefiting from a reliable, energy-efficient system that was eligible for available grant programs.
Why the Willis wall-mounted heat pump?
The Willis brand is renowned for its compact, high-performance units, ideal for residential properties in the greater Montreal area. In this case, the chosen model offered:
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A capacity adapted to the needs of the house ( BTU sizing adjusted according to the surface area and insulation).
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Stable operation in heating mode even at low temperatures.
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Energy efficiency in accordance with the criteria of Quebec government programs .
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Reliability adapted to the harsh winters of the South Shore .
Technical details of the installation
Our team installed the outdoor condenser on a galvanized steel wall bracket , securely fixed to the concrete facade adjacent to the garage. This configuration has several advantages:
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Optimal ground clearance : protection against snow accumulation and debris.
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Enhanced stability : robust mounting minimizes vibrations.
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Easy accessibility for maintenance and periodic inspections.
The refrigerant lines and electrical wiring were carefully sheathed and connected to a sealed junction box, ensuring the safety and durability of the installation. The tubing length was optimized to reduce energy losses and maintain the machine's nominal performance.
The challenges encountered and our solutions
Every project presents its challenges. In this case, we were working on a decorative stone façade combined with a smooth concrete base. Our technicians used specialized anchors to ensure impeccable fixation without compromising the aesthetics or watertightness of the structure.
Another aspect concerned the working height. Since the unit was installed several meters above the ground, we used secure equipment to comply with workplace safety standards, while ensuring a precise and durable installation.
Results obtained
Upon completion, the client immediately noticed a difference in comfort and noise reduction. The Willis outdoor unit operates quietly, and the interior of the home benefits from even heating and cooling.
In addition to comfort, the owner now benefits from:
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Significant energy savings on annual bills.
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Eligibility for provincial and federal grants , which reduce the initial investment.
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A scalable and sustainable system, capable of meeting seasonal needs efficiently.
AirGreen expertise in Sainte-Julie and throughout Greater Montreal
This project is a good example of our personalized approach: understanding the building's constraints, choosing the right machine, and executing a flawless installation. At AirGreen , we cover the entire Greater Montreal area, including Laval, Longueuil, the North Shore and the South Shore , with the same attention to detail and quality of service.
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).