Installation of a Willis wall-mounted air conditioner in Ahuntsic-Cartierville
AirGreen installed a Willis wall-mounted air conditioner in Ahuntsic-Cartierville. An efficient, quiet, and discreet HVAC solution, perfectly suited to the climate 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.
A discreet and efficient installation project in a Montreal condo
At AirGreen , we know that optimal comfort depends as much on the choice of the machine as on the quality of its installation. This project in Ahuntsic-Cartierville perfectly illustrates how a Willis wall-mounted air conditioner can transform the interior comfort of a residential space, even in a condo with specific technical constraints.
Choosing the Willis wall-mounted air conditioner
The Willis brand has established itself as a reliable and affordable option in the wall-mounted air conditioner market. The unit installed here is a compact model, designed to offer:
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Stable energy performance while meeting efficiency standards for the Quebec climate.
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Quiet operation , ideal for a bedroom or living room.
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Discreet integration into the decor thanks to its neutral white finish and sleek profile.
With a capacity sized for an average room, this unit helps maintain a comfortable temperature in summer while contributing to better humidity management.
The particularities of the site
In this Ahuntsic-Cartierville condo, several elements guided our technical choices:
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Installation height : The wall unit has been positioned close to the ceiling for better air distribution and to free up wall space.
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Wiring and piping route : The outlet is directly to the right of the unit, passing through the wall to the outside. This approach reduces the length of piping required and limits heat loss.
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Condensate management : evacuation is carried out by gravity, thanks to a discreet outlet facing outwards, thus avoiding the addition of a pump and reducing maintenance risks.
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Electrical Compatibility : A dedicated circuit breaker has been confirmed, ensuring the safety and performance of the device.
Challenges encountered and solutions provided
One of the main challenges of this installation was the close proximity of a door and curtain rod. To avoid any airflow obstruction and maintain the door's freedom of opening, our team:
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Adjusted the exact position of the unit to allow enough space around existing elements.
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Checked the clearances required to ensure optimal air circulation.
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Used a minimalist exterior passage to maintain a sober aesthetic, both inside and outside the building.
Result: comfort and aesthetics combined
The result is an installation that perfectly meets the client's expectations:
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A high-performance, quiet Willis wall-mounted air conditioner .
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Careful integration, without major visual impact on the wall or on the layout of the room.
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Immediate comfort, with a consistent and pleasant temperature even on hot Montreal days.
Benefits for the customer
By choosing AirGreen for their project, the owner benefits from:
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From our local expertise in HVAC installation in Greater Montreal (Montreal, Laval, North Shore, South Shore).
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A full warranty covering parts and labor.
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Personalized support for the future maintenance of your device.
Maintenance and longevity of the wall-mounted air conditioner
To extend the life of your device, we recommend:
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Annual filter cleaning and complete preventative maintenance.
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Periodic inspection of refrigerant piping and external fittings.
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A check of the condensate drainage to avoid any accumulation of water.
Conclusion
This installation of a Willis wall-mounted air conditioner in Ahuntsic-Cartierville is a testament to our team's expertise. At AirGreen, we combine technical expertise, attention to detail, and customer service to provide every Greater Montreal resident with a sustainable, efficient HVAC solution that's adapted to their environment.
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?
Where does the outdoor unit go?
Are there grants?
Do I need a permit?
How cold can it heat?
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How is the LogisVert assistance calculated?
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The outdoor unit is covered in ice: is that normal?
Does AirGreen hold the required licences?
Is the estimate free?
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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).