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Installation of a Senville LETO wall-mounted air conditioner in Rosemont–La Petite-Patrie

Installation of a Senville LETO wall-mounted air conditioner in Rosemont–La Petite-Patrie. AirGreen guarantees optimal summer comfort and careful installation throughout Montreal and the surrounding area.

By AirGreen Climatisation & Chauffage Admin4 min read
Installation of a Senville LETO wall-mounted air conditioner in Rosemont–La Petite-Patrie
Installation of a Senville LETO wall-mounted air conditioner in Rosemont–La Petite-Patrie
Generic diagram: wall-mounted heat pump, indoor and outdoor units

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.

  1. 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.

  2. The refrigerant lines, the communication cable and the drain go through the wall in a single opening, sealed against water, cold air and insects.

  3. Two insulated copper pipes connect the two units. Outside, a line cover can protect them from sun, knocks and weather.

  4. A shut-off switch near the outdoor unit isolates it safely for service. It must stay accessible at all times.

  5. The compressor and the fan. In heating mode it captures heat from the outdoor air, even in winter, and moves it inside.

  6. On the ground or on the wall, it keeps the unit above accumulated snow. The unit stays clear and defrost water can drain away.

  7. The fan needs to blow freely. Storage, a fence or a wall too close, and efficiency drops while noise goes up.

An HVAC installation project that combines comfort and discretion

At AirGreen , we recently completed a Senville LETO wall-mounted air conditioner installation in an apartment in the Rosemont–La Petite-Patrie area of ​​Montreal. This urban neighborhood, known for its brightly lit plexes, often requires compact and quiet air conditioning solutions, perfectly suited to residential spaces where every detail counts. Our client wanted to improve their summer comfort while maintaining a discreet and elegant aesthetic in their living room.

Choosing the Senville LETO: performance and accessibility

The Senville LETO is a model renowned for its reliability, ease of use, and balanced energy efficiency . Available in various capacities, it is well suited to Montreal apartments where the average room size generally requires a power output of 9,000 to 12,000 BTUs. This choice helps maintain a stable temperature while reducing energy consumption, a crucial point for residents sensitive to electricity costs.

  • Machine type : wall-mounted air conditioner (mini-split)

  • Brand : Senville

  • Model : LETO

  • Capacity : 9,000 or 12,000 BTU (depending on the configuration chosen for the accommodation)

  • Grant eligibility : generally not applicable, as this is a wall-mounted air conditioner and not a heat pump, but its low consumption remains a financial asset.

Technical details of the installation

Since the apartment is located on the first floor of a typical Rosemont apartment complex, the installation required a direct wall penetration to connect the indoor header to the outdoor condenser. Here are the key points of the project:

  • Indoor positioning : wall unit installed at the optimal height, above the living room sofa, ensuring even air diffusion.

  • Drainage management : installation of a discreet gravity drain , avoiding the need for a condensate pump and thus reducing noise and maintenance.

  • Refrigerant connections : reduced length (less than 3 meters), minimizing efficiency losses.

  • Aesthetic finish : use of discreet white capping , harmonized with the color of the wall, for a refined visual effect.

  • External support : condenser fixed on sturdy wall brackets, on the rear facade, allowing floor space to be freed up and maintenance to be facilitated.

Challenges encountered and solutions provided

As is often the case in older buildings in Rosemont, we had to deal with thicker than average walls , requiring specialized tools for drilling. In addition, the client wanted to maintain a fully reversible and aesthetic installation, without distorting the interior design. Our technicians therefore:

  1. Performed a precise drilling with a diamond core drill to penetrate the load-bearing wall.

  2. Ensure the seal is sealed with suitable weatherstripping to prevent any infiltration of air or moisture.

  3. Position the unit to avoid direct airflow onto the rest area while maximizing thermal comfort.

Results obtained

Upon commissioning, the customer noticed an immediate reduction in the heat accumulated in his home. The Senville LETO wall-mounted air conditioner stood out for:

  • Its quiet sound : almost inaudible operation at low speed.

  • Its rapid and even diffusion of air in the main room.

  • Its intuitive control via remote control, allowing you to easily adjust the temperature.

The client particularly appreciated the cleanliness of the installation and the care taken with the finishes, a guarantee of professionalism specific to the AirGreen team.

Why choose AirGreen for your wall-mounted air conditioner installation in Montreal?

Installing a wall-mounted air conditioner may seem simple, but each project has its own specificities:

  • Architectural constraints (wall thickness, room layout, facade orientation).

  • Drainage management (gravity vs. condensate pump).

  • Optimization of the length of refrigerant connections to maintain efficiency.

  • Aesthetics of the installation, often neglected but essential in a home.

At AirGreen, we make it a point of honor to respect these details, ensuring our customers comfort, energy efficiency and sustainability . Whether you are in Montreal, Laval, Longueuil, on the North Shore or the South Shore , we adapt each installation to your needs and your environment.

Maintenance and recommendations to extend the lifespan

A wall-mounted air conditioner like the Senville LETO requires regular maintenance to ensure its longevity:

  • Clean filters every 4 to 6 weeks during periods of intensive use.

  • Annual verification of refrigerant pressures and performance by a certified technician.

  • Drain inspection to prevent blockages and water leaks.

These best practices help maintain optimal performance while avoiding costly repairs.

Conclusion

The installation of this Senville LETO wall-mounted air conditioner in Rosemont–La Petite-Patrie perfectly illustrates our approach: adapting HVAC technology to the customer's real needs and the constraints of their home . The result: a more comfortable summer, careful installation, and guaranteed peace of mind.

The steps

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.

Step 1 of 9The on-site estimate

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.

  1. 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.
  2. The quoteModel, capacity and price, in writing. We also check whether the model qualifies for assistance programs.
  3. Getting readyFloors and furniture protected, wall plate position marked level, wall opening located.
  4. The wall openingA single opening, with the slope the drain needs to flow outside.
  5. The outdoor unitSet on a stand raised above the snow, with the clearances the manufacturer requires.
  6. Lines, cable and drainConnected, insulated and protected. The opening is then sealed against water, cold air and insects.
  7. The electrical workA dedicated circuit and an accessible disconnect near the outdoor unit.
  8. Tests and start-upLeak test, vacuum, then start-up and a check of heating and cooling.
  9. The walkthroughRemote, modes, filters: we show you the essentials before we leave.
Your numbers

And at your place?

Two quick checks with real numbers: what heat costs, and what your current heaters add up to in BTU/h.

Size checkYour baseboards, in BTU/h
–BTU/h of installed electric heat

    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.

    Through the seasons

    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.
    And at your place?

    Which type of equipment for your project?

    Pick what looks like your need.

    Mistakes avoided

    Four mistakes we do not make

    Flip each card to see what we do instead.

    Frequently asked questions

    What people ask us about this kind of work

    12 questions
    Does a wall-mounted heat pump heat in winter?
    Yes, it heats and cools. Its capacity drops in very cold weather; the operating range depends on the model and is listed on its spec sheet.
    Wall-mounted or multi-zone: how do I choose?
    One wall head and one condenser outside: the direct solution for a room or an open area. For two to five rooms, a multi-zone puts one head in each room on a single condenser.
    Where does the outdoor unit go?
    Where it stays above the snow, clear and accessible, away from walkways. We decide it with you during the estimate.
    Are there grants?
    Depending on the model and your situation, assistance programs may apply, including Hydro-Québec's LogisVert. AirGreen checks the model number before quoting an amount. See the grants.
    Do I need a permit?
    Rules vary from city to city: location, distances, noise. See permits and by-laws, and we check for your address.
    How cold can it heat?
    It depends on the model. According to Hydro-Québec, newer models work down to a temperature between −15 °C and −25 °C, and some cold-climate models are certified lower. The minimum temperature is on each unit's spec sheet.
    How much can I save?
    Hydro-Québec says a heat pump can be up to three times more efficient than baseboards for heating in the colder months. The result depends on the house, the climate and how it is used.
    How is the LogisVert assistance calculated?
    For ENERGY STAR cold-climate certified heat pumps, Hydro-Québec lists assistance of $120 per 1,000 BTU/h of heating capacity at −8 °C. AirGreen checks the exact model before quoting an amount; only Hydro-Québec confirms the assistance granted. See the grants.
    Is it noisy?
    The sound level depends on the model and is listed in decibels on each unit's spec sheet. Location matters too: when possible, we avoid putting the outdoor unit under a bedroom window.
    The outdoor unit is covered in ice: is that normal?
    Some frost is: the unit runs defrost cycles. Never hit the ice. If the unit stays iced up or stops heating, call us.
    Does AirGreen hold the required licences?
    Yes. AirGreen holds RBQ licence 5645-9605-01, subclasses 15.8 Ventilation, 15.10 Refrigeration and 16 Electricity.
    Is the estimate free?
    Yes. The on-site estimate is free and the quote follows within 24 hours. Book my free estimate.
    Going further

    Useful pages for what comes next

    GrantsAssistance programs in effectAirGreen checks your model before quoting an amount.PermitsYour city’s rulesLocation, distances, noise: what changes from city to city.InstallationOur installation serviceGreater Montréal and Montérégie.

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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).

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