Installation of a Lennox wall-mounted air conditioner in Ville-Marie
AirGreen installs a Lennox wall-mounted air conditioner in Ville-Marie. A discreet, efficient HVAC solution perfectly suited to condos in downtown Montreal, Laval, Longueuil, the North Shore, and the 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.
An air conditioning solution adapted to the reality of downtown condos
At AirGreen , we regularly install Lennox wall-mounted air conditioners in buildings in downtown Montreal. This example in Ville-Marie perfectly illustrates the combination of energy efficiency and discreet integration into a modern residential space.
The installed unit is a compact Lennox wall unit, designed to meet the specific needs of an urban condo , where every square meter counts and acoustic management is essential.
Comfort and energy efficiency in everyday life
The choice of a Lennox wall-mounted air conditioner for this project is explained by several major advantages:
-
Quiet : ideal for a condo where sound comfort is essential.
-
Compactness : discreet design that fits perfectly into the interior.
-
Optimized energy efficiency : reduced consumption thanks to Inverter technology, which modulates the compressor speed according to actual needs.
-
Eligibility for energy efficiency programs : depending on the exact model, certain units may be eligible for current Quebec subsidies.
Precise installation procedure
The installation carried out by our team in this Ville-Marie condo included several technical features:
-
Indoor unit fixed high , above the lighting level to ensure better air diffusion.
-
Through hole to the outside , with a passage for insulated and sheathed piping.
-
Secure electrical connection , made up to the main panel, in compliance with the CSA standard.
-
Condensate management by gravity , without the need to add a lifting pump, which limits the risks of future maintenance.
-
Discreet finish with white capping , blending perfectly into the interior decor.
Thanks to these carefully planned steps, the installation was completed in a single day, without disturbing the occupants.
Constraints identified and solutions provided
Installing a wall-mounted air conditioner in a downtown condo requires special attention:
-
Limited space constraint : the device has been strategically positioned so as not to encroach on the living area.
-
Respect for the co-ownership : our technicians used clean drilling methods that complied with the building's rules.
-
Airflow optimization : By choosing a suitable height, we have maximized comfort while avoiding direct air currents.
Why choose AirGreen for your HVAC projects in Montreal?
Our expertise in installing Lennox wall-mounted air conditioners in Montreal, Laval, Longueuil, on the North Shore and the South Shore is based on:
-
In -depth knowledge of the models offered by major brands (Lennox, Fujitsu, Gree, Midea, Sharp).
-
A mastery of local architectural particularities , whether urban condos, duplexes in the Plateau-Mont-Royal or single-family homes in the suburbs.
-
Turnkey installations , with full warranty and after-sales support.
Maintenance and durability
As with any HVAC installation, we recommend annual maintenance to ensure:
-
Cleaning the filter and evaporator.
-
Checking refrigerant pressures.
-
Condensate drainage control.
-
Complete electrical and mechanical inspection.
This preventative maintenance extends the life of the appliance and guarantees optimal performance, summer after summer.
By choosing AirGreen , you benefit from a professional installation, adapted to the realities of Greater Montreal, and complete support, from model selection to after-sales service.
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.
Which type of equipment for your project?
Pick what looks like your need.
Four mistakes we do not make
Flip each card to see what we do instead.
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.
Useful pages for what comes next
More jobs to see, near you
By town, by equipment or by region: browse more than 4,700 published projects.
Each dot: a town where AirGreen has published projects. The glowing dot: this job.
Tell us about your house. We come and see it for free.
The on-site estimate is free and the quote follows within 24 hours.
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).