Installation of an Ameristar wall-mounted air conditioner in Rosemont–La Petite-Patrie
AirGreen installed an Ameristar wall-mounted air conditioner in Rosemont–La Petite-Patrie. A discreet, efficient, and durable HVAC solution, ideal for residential comfort in Montreal and throughout the Greater Montreal area.
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.
Modern comfort in a Montreal apartment
At AirGreen , we recently installed an Ameristar wall-mounted air conditioner in an apartment located in Rosemont–La Petite-Patrie . This project illustrates the growing demand among Montreal residents for discreet, efficient HVAC solutions adapted to urban environments where interior space must be optimized.
Why choose an Ameristar wall air conditioner?
The client primarily wanted a reliable and compact air conditioning solution to improve their summer comfort, without resorting to a central system. The Ameristar wall-mounted unit was chosen for its features:
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Suitable cooling capacity (9,000 to 12,000 BTU), ideal for medium-sized apartments.
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Superior energy efficiency , allowing for reduced electricity consumption.
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Sleek design , fitting perfectly into a modern interior with light tones.
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Durability and ease of maintenance , essential for everyday residential use.
Challenges encountered and solutions provided
The installation had two technical features:
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Mounting height : the device was installed at the top of the wall, under the ceiling, to ensure even distribution of air throughout the space.
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Drilling management : a precise passage was made in the exterior wall to connect the refrigeration lines and the condensate drain, while minimizing the visual impact inside the home.
Our technicians have taken care to preserve the aesthetics of the wall, notably thanks to discreet capping matching the color of the room.
Installation Steps
Our specialists have followed a rigorous process:
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Site assessment and selection of the most optimal location for the wall unit.
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Drilling and passage of refrigeration pipes with complete insulation to avoid any energy loss.
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Ameristar indoor unit mounting with perfect leveling.
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Installation of the outdoor unit , electrical and refrigeration connections.
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Commissioning and calibration to ensure quiet operation and optimal performance.
Immediate results
Upon startup, the customer noted:
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Rapid reduction of indoor temperature , even on hot days.
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A more pleasant atmosphere thanks to reduced humidity.
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Almost inaudible operation , preserving the peace and quiet of the home.
AirGreen expertise in Greater Montreal
This project demonstrates AirGreen's expertise in residential HVAC installation in Montreal, Laval, Longueuil, on the North Shore and the South Shore . Our customers benefit from:
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Tailor-made advice to help you choose the right BTU capacity.
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Facilities complying with standards guaranteeing safety and performance.
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Aesthetic optimization , by integrating the conduits and cappings in a harmonious manner.
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Support for grants available depending on the type of equipment chosen.
Recommended maintenance
To ensure the longevity of the Ameristar wall air conditioner, we recommended to the customer:
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Annual HVAC maintenance including filter cleaning, drain inspection and refrigerant charge check.
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Regular monitoring of the outdoor unit to prevent the accumulation of leaves, dust or urban debris.
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Smart use by maintaining a stable temperature rather than multiplying stops and restarts.
Conclusion: A sustainable investment for summer comfort
Thanks to this installation of an Ameristar wall-mounted air conditioner in Rosemont–La Petite-Patrie , the customer now enjoys optimal indoor comfort, with a discreet, efficient, and durable unit. At AirGreen , we make every effort to ensure that every HVAC project in Greater Montreal is synonymous with quality and satisfaction.
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).